TECHNICAL FIELD

The present invention relates to a test mechanism for pressure-force test of a stretcher motor used in stretching of felts used transfer of paper in paper machines which produce paper.

PRIOR ART

Paper and paper products are used in various areas of our lives. As an example, packaging, cosmetic, hygiene, health, advertisement sectors are among the sectors where paper is most frequently used. Paper raw materials are fibers obtained as a result of recycling of waste paperboards and specific filtering processes.

In paper production machines; paper must be passed between felts for producing paper and for subjecting paper to specific processes. In these processes, stretcher motors are used. These stretcher motors are essentially hydraulically driven motors. Failure can occur in stretcher motors over time, and items like piston, snap ring, brake group, bell spring which may exist at the inner part may have to be changed. In such cases, stretcher motor is repaired. As a result of this repair, the stretcher motor is desired to be operated at the desired performance.

The application with no CN204003791 U known in the literature relates to a hydraulic motor test device. More particularly, the invention aims to provide a hydraulic motor test device which has a simple structure and which is easy to assemble and which can realize a hydraulic motor shaft operation condition simulation test in a simple and rapid manner. Radial torque loading mechanism is assembled onto the rotary shaft of the hydraulic motor. Radial torque loading mechanism comprises a loading ring at the outermost section. One end of the loading arm is connected to the loading ring and the other end of the loading arm is connected to the loading drive device. Hydraulic cylinder is used as the loading drive device. By placing pressure sensor on the loading arm, the size of the load and test parameters can be controlled in a real-timed manner. Hydraulic cylinder exerts radial force to the loading ring by means of the loading arm. The radial force which exists here rotates the hydraulic motor shaft. In the present art, there are some test mechanisms. However, such known test mechanisms are used in detection of the total force efficiency of the motor. In the present art, there is no such solution for detection of the efficiency of the stretcher motor for each piston.

As a result, because of the abovementioned problems, an improvement is required in the related technical field.

BRIEF DESCRIPTION OF THE INVENTION

The present invention relates to a test mechanism, for eliminating the abovementioned disadvantages and for bringing new advantages to the related technical field.

An object of the present invention is to provide a test mechanism for use in testing of stretcher motors used in paper production.

In order to realize the abovementioned objects and the objects which are to be deducted from the detailed description below, the present invention is a test mechanism for force test of a stretcher motor used in stretching of felt in paper machines which produce paper. Accordingly, the improvement is that the subject matter test mechanism comprises at least one chassis whereon said stretcher motor is positioned, at least one movement transfer apparatus associated with the stretcher motor and which can be at least partially rotated around itself by means of the drive received from the stretcher motor, pluralities of wings associated with different pistons of the stretcher motor on said movement transfer apparatus, and at least one sensor associated with said wings and which detects the force exerted to the wing. Thus, performance test of stretcher motors used in paper machines can be realized after maintenance and repair thereof.

In a possible embodiment of the present invention, said sensor comprises at least one manometer and at least one hydraulic cylinder for realizing force detection. Thus, the test mechanism is produced in a facilitated manner.

In another possible embodiment of the present invention, the wing is configured such that the force of the wing is detected by resting the wing onto the sensor. Thus, the load, exerted onto the wing, can be detected by the sensor. In another possible embodiment of the present invention, three wings are provided on the movement transfer apparatus. Thus, the five pistons, which exist in the hydraulic stretcher motor, are associated with these wings in the form of groups of two, and testing of different pistons can be realized through different wings.

In another possible embodiment of the present invention, an assembly hole is provided on at least one side wall for connecting the stretcher motor onto said chassis. Thus, the stretcher motor can be easily assembled onto the chassis.

In another possible embodiment of the present invention, in order to keep the stretcher motor in a stable manner on the chassis, at least one base and at least one rib are provided adjacent to said side wall. Thus, the chassis has a resistant structure.

BRIEF DESCRIPTION OF THE FIGURES

In Figure 1 , a representative lateral view of the system, whereon the stretcher motor tested in the subject matter test mechanism is used, is given.

In Figure 2, a representative top view of the system, whereon the stretcher motor tested in the subject matter test mechanism is used, is given.

In Figure 3, a representative perspective view of the subject matter test mechanism is given.

DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the subject matter is explained with references to examples without forming any restrictive effect only in order to make the subject more understandable.

With reference to Figure 1 and 2, the present invention relates to a stretcher motor (10). In the invention, said stretcher motor (10) is used in at least one paper machine (1). The subject matter stretcher motor (10) is used in at least partially stretching of felts associated with the paper in said paper machine (1). In the paper machine (1 ), paper is transferred without contacting cylinders between felts and is produced. The stretcher motor (10) provides stretching of the felts used in paper machine (1) with the desired stretcher. For providing this, the stretcher motor (10) is preferably hydraulically driven and operates by means of pressured hydraulic oil. There is at least one stretcher vehicle (11 ) at the paper machines (1). Said stretcher vehicle (11) is made of steel plate at the saloon and drive sides. Pluralities of stretcher vehicles (11) can be provided on the paper machine (1). The stretcher vehicle (11) is moved by at least one gear (12). The stretcher vehicles (11) move along at least one beam (16) advanced by at least one gear (12), rack (15) and pinion provided in at least one bearing element (13).

The stretcher vehicles (11) are moved together with at least one stretcher cylinder (14). For providing this, simultaneous movement of said stretcher vehicles (11 ) and said stretcher cylinder (14) is provided by means of at least one shaft (17) at both sides. Said shaft (17) transfers the torque required by the movement. The stretcher cylinder (14) is placed essentially to the drive side of a single stretcher vehicle (11) for providing stretcher. By means of this, the drive moves together with the stretcher vehicle (11 ). The maximum value of the transfer movement is delimited by means of end stoppers which can endure stretcher load.

In Figure 3, a representative perspective view of the subject matter test mechanism (20) is given. Accordingly, in case of periodic maintenance and in case of repair of stretcher motor (10) as a result of failure, the performance of the stretcher motor (10) must be detected. For providing this, the subject matter test mechanism (20) is used. The power of the stretcher motor (10) is detected by means of this test mechanism (20).

There is at least one chassis (21 ) on the test mechanism (20). Stretcher motor (10) can be positioned on said chassis (21). There is at least one side wall (22), at least one base (24) and at least one rib (25) on the chassis (21). Said base (24) enables seating of the chassis (21) onto the floor. There is at least one assembly hole (23) in order to be able to position the stretcher motor (10) on said side wall (22) of the chassis (21). Stretcher motor (10) can be positioned in a fixed manner on said assembly hole (23). Said rib (25) is positioned between said side wall (22) and said base (24). The chassis (21) can be held in a resistant manner during the test by means of the rib (25).

In the test mechanism (20), the stretcher motor (10) comprises at least one movement transfer apparatus (26) Said movement transfer apparatus (26) is positioned at the end part of the stretcher motor (10). The movement transfer apparatus (26) is at least partially rotated around itself by means of the drive received from the stretcher motor (10). The movement transfer apparatus (26) has at least one wing (27). Said wing (27) is provided in the form of a protrusion which extends outwardly from the center of the movement transfer apparatus (26). In a possible embodiment, there are pluralities of wings (27) on the movement transfer apparatus (26). There are preferably three wings (27). Each wing (27) is associated with different pistons provided on the stretcher motor (10). Thus, separate force tests can be applied to each wing (27). For providing this, there are five pistons for hydraulic force transfer in the stretcher motor (10) and they are associated with wings (27) in the form of groups of two.

There is at least one sensor (28) at the test mechanism (20). Said sensor (28) is associated with at least one of the wings (27) provided on the movement transfer apparatus (26). The sensor (28) detects the amount of the load exerted as the movement transfer apparatus (26) is rotated around itself by the stretcher motor (10). For providing this, the sensor (28) is preferably a hydraulic piston. The hydraulic piston which exists on the sensor (28) is associated with a manometer. Said manometer is used in detecting the amount of the occurring load in case load is applied to the hydraulic piston. By means of this, force load can be detected separately for each wing (27).

In a possible usage of the present invention, after maintenance, the stretcher motor (10) is connected to the chassis (21 ) of the test mechanism (20). The movement transfer apparatus (26) is also connected to the stretcher motor (10). For realizing pressure measurement, the wings (27) of the movement transfer apparatus (26) are contacted to the sensor (28) sequentially. In case the sensor (28) is a hydraulic cylinder, the hydraulic cylinder rod shaft is aligned at the position where said hydraulic cylinder rod shaft is open at maximum stroke. Afterwards, the same pressure is continuously applied to the stretcher motor (10), and the pressure value applied by each wing to the sensor (28) is detected. In the invention, in order to determine the correctness of the data taken from the stretcher motor (10) which has been repaired or where maintenance is applied; the data taken from a stretcher motor (10) which is known to be compliant to operation conditions can be used. By means of this, the compliancy of the stretcher motor (10) which has been repaired or where maintenance is applied can be detected.

By means of all these embodiments, in the paper machine (1), the compliancy of various components (piston, snap ring, bell spring, etc.) in the maintenance and after maintenance of the stretcher motors (10), which are used in totally 16 separate places and where maintenance has to be applied at specific periods, can be detected. As the wings (27) of the movement transfer apparatus (26) used in the subject matter test mechanism (20) are associated with pistons separately, different force data can be detected from the same motor. Maintenances of the hydraulic stretcher motors (10) are realized without hindering periodic maintenance activities, and said motors, where maintenance is realized, are tested, and production losses are prevented.

The protection scope of the present invention is set forth in the annexed claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention.

REFERENCE NUMBERS

I Paper machine

10 Stretcher motor

I I Stretcher vehicle

12 Gear

13 Bearing element

14 Stretcher cylinder

15 Rack

16 Beam

17 Shaft

20 Test mechanism

21 Chassis

22 Side wall

23 Assembly hole

24 Base

25 Rib

26 Movement transfer apparatus

27 Wing

28 Sensor