Test fixture of microwave amplifier

Abstract

The utility model discloses a test fixture for a microwave amplifier, which belongs to the technical field of microwave amplifier detection, and comprises a detection platform, the top of the detection platform is movably connected with a convenient clamping mechanism, and the inner side of the convenient clamping mechanism is movably connected with a multi-stage buffer mechanism. The inner side of the convenient clamping mechanism is movably connected with an equipment body, a pull rod and a linkage rod are driven by a driving motor, so that a clamping plate conveniently clamps and fixes the microwave amplifier equipment body to be detected, limiting can be easily relieved by reversely rotating the driving motor after detection is finished, the clamping process is simplified, the test preparation and recovery time is effectively shortened, and the test efficiency is improved. During pressure detection, in the downward pressing process of the supporting bottom plate, a telescopic supporting column, a second compression spring, a connecting rod, a component force block, a second tension spring and a third compression spring work cooperatively, pressing thrust is converted into multidirectional elastic potential energy and mechanical work, and the good damping effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of microwave amplifier testing technology, and in particular to a test fixture for microwave amplifiers. Background Technology

[0002] Microwave amplifiers, as key components, are widely used in many fields such as communications, radar, and remote sensing, playing a decisive role in system performance. Their housings must have sufficient pressure strength to withstand complex external environments, such as bumps during transportation and pressure changes under extreme weather conditions. On the other hand, the thermal expansion and contraction caused by the heat generated during internal operation also puts pressure on the housing. If the housing pressure strength is insufficient, it is prone to deformation and cracking, resulting in damage to internal circuits, causing signal distortion, power reduction, or even complete equipment failure. However, traditional testing methods have shortcomings in accuracy and testing efficiency, making it difficult to meet the increasingly stringent quality control requirements of microwave amplifiers. There is an urgent need for innovative testing technologies to ensure that the housing pressure strength meets the standards and to guarantee the stable and reliable operation of microwave amplifiers.

[0003] In existing technologies, pressure testing is performed by placing a microwave amplifier on a processing platform and clamping it, then using a hydraulic rod to drive a hydraulic plate to gradually increase pressure. However, the clamping process is quite complicated, making test preparation and retrieval work lengthy. Furthermore, during clamping, the contact between the fixture and the object under test can easily cause excessive clamping force, damaging the outer shell and internal electronic components of the object. This can lead to misjudgments of damage data as failure of pressure strength test or damage to the object under test. In addition, during the pressure test, the object under test may vibrate due to the gradual increase in pressure. Additional damage caused by vibration can easily be misjudged as a problem with pressure strength test, resulting in low reliability of the test data.

[0004] To address this, a test fixture for microwave amplifiers is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a test fixture for microwave amplifiers that can solve the problems of lengthy clamping processes, large clamping forces, and data misjudgment and damage to the test object caused by vibration in existing systems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a test fixture for a microwave amplifier, comprising a test platform, wherein a convenient clamping mechanism is movably connected to the top of the test platform, a multi-stage buffer mechanism is movably connected to the inner side of the convenient clamping mechanism, and a device body is movably connected to the inner side of the convenient clamping mechanism.

[0007] The convenient clamping mechanism includes a hollow base, a buffer assembly, a support base plate, a top plate, and a clamping assembly. The hollow base is fixedly connected to the top of the detection platform. The buffer assembly is movably connected to the inner side of the hollow base. The support base plate is movably connected to the top of the buffer assembly and the top of the inner side of the hollow base. The top plate is fixedly connected to the top of the support base plate. The clamping assembly is movably connected to the top of the support base plate and the outer side of the top plate. The device body is located on the top of the top plate.

[0008] Preferably, the multi-stage buffer mechanism includes a nested telescopic block, a first telescopic rod, a first compression spring, a buffer block, a second telescopic rod, and a first tension spring.

[0009] Preferably, the nested telescopic block is movably connected to the outside of the clamping assembly, the first telescopic rod is fixedly connected to the left and right sides of the inner side of the nested telescopic block, the first compression spring is fixedly connected to the outside of the first telescopic rod, the buffer block is fixedly connected to the right side of the left first telescopic rod, and the buffer block is fixedly connected to the left side of the right first telescopic rod.

[0010] Preferably, the second telescopic rod is rotatably connected to the outside of the buffer block, and the second telescopic rod is rotatably connected to the front and rear sides of the inner side of the nested telescopic block, and the first tension spring is fixedly connected to the outside of the second telescopic rod.

[0011] Preferably, the buffer assembly includes a telescopic strut, a second compression spring, a guide slide, a force-sharing block, a connecting rod, a second tension spring, and a third compression spring.

[0012] Preferably, the telescopic support column is fixedly connected to the bottom of the inner side of the hollow base, the support base plate is fixedly connected to the top of the telescopic support column, the second compression spring is fixedly connected to the outer side of the telescopic support column, the guide slide rod is fixedly connected to the inner side of the hollow base, the force distribution blocks are movably connected to the left and right sides of the outer side of the guide slide rod, the second tension spring is fixedly connected to the right side of the left force distribution block, the second tension spring is fixedly connected to the left side of the right force distribution block, the third compression spring is fixedly connected to the left side of the left force distribution block, the third compression spring is fixedly connected to the right side of the right force distribution block, the left third compression spring is fixedly connected to the left side of the inner side of the hollow base, and the right third compression spring is fixedly connected to the right side of the inner side of the hollow base.

[0013] Preferably, the clamping assembly includes a clamping plate, a connecting rod, a pull rod, a rotating block, and a drive motor.

[0014] Preferably, the clamping plate is slidably connected to the top of the storage top plate, the linkage rod is fixedly connected to the bottom of the clamping plate, the linkage rod is slidably connected to the bottom of the storage top plate, the pull rod is rotatably connected to the outside of the linkage rod, the pull rod is rotatably connected to the outside of the rotating block, the rotating block is fixedly connected to the output end of the drive motor, the drive motor is fixedly connected to the top of the inner side of the support base plate, and the nested telescopic block is connected to the outside of the clamping plate.

[0015] Preferably, a support base is fixedly connected to the outside of the detection platform.

[0016] Preferably, a hydraulic rod is movably connected to the bottom of the inner side of the support base, and a pressure detection plate is movably connected to the bottom of the hydraulic rod.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This application simplifies the clamping process by setting up a convenient clamping mechanism and providing a buffer structure at the bottom of the clamping table to achieve convenient clamping and shock absorption during pressing. The drive motor drives the pull rod and connecting rod to make the clamping plate conveniently clamp and fix the body of the microwave amplifier device under test. After the test, the reverse rotation of the drive motor can easily release the limit, simplifying the clamping process and effectively reducing the test preparation and recovery time. During pressure testing, during the pressing of the support base plate, the telescopic column, the second compression spring, the connecting rod, the force distribution block, the second tension spring, and the third compression spring work together to convert the pressing thrust into multi-directional elastic potential energy and mechanical work, which has a good shock absorption effect and avoids vibration interference with the test data. This solves the problems of low reliability of test data due to vibration and the lengthy test preparation and recovery work.

[0019] 2. This application, by setting up a multi-level buffer mechanism, can achieve stepped clamping buffer through a nested telescopic block structure. When the clamping plate contacts the equipment body, the nested telescopic blocks contact first, and the large and small nested blocks slide and retract. During this process, the first telescopic rod and the first compression spring retract, and the second telescopic rod and the first tension spring stretch to accumulate elastic potential energy and buffer the retraction. This can effectively avoid excessive clamping force, prevent damage to the equipment body shell and electronic components, and avoid misjudgment of the pressing test data due to excessive clamping force. Through the telescopic deformation of the nested telescopic blocks and the buffering of the elastic components, the clamping force is controlled within a suitable range, solving the problem of excessive clamping force damaging the object under test and causing misjudgment of the test when the clamp is clamped. Attached Figure Description

[0020] Figure 1 This is an overall structural diagram of the test fixture for the microwave amplifier of this utility model;

[0021] Figure 2 This is an overall structural diagram of the convenient clamping mechanism of this utility model;

[0022] Figure 3 This is an overall structural diagram of the buffer assembly of this utility model;

[0023] Figure 4 This is an overall structural diagram of the clamping assembly of this utility model;

[0024] Figure 5 This is an overall structural diagram of the multi-stage buffer mechanism of this utility model.

[0025] In the diagram, 1. Testing platform; 2. Convenient clamping mechanism; 21. Hollowed-out base; 22. Buffer assembly; 22a. Telescopic support column; 22b. Second compression spring; 22c. Guide slide rod; 22d. Force distribution block; 22e. Connecting rod; 22f. Second tension spring; 22g. Third compression spring; 23. Support base plate; 24. Storage top plate; 25. Clamping assembly; 25a. Clamping plate; 25b. Linkage rod; 25c. Pull rod; 25d. Rotating block; 25e. Drive motor; 3. Multi-stage buffering mechanism; 31. Nested telescopic block; 32. First telescopic rod; 33. First compression spring; 34. Buffer block; 35. Second telescopic rod; 36. First tension spring; 4. Equipment body; 5. Support base; 6. Hydraulic rod; 7. Pressing and testing plate. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-5 The present invention provides the following technical solution:

[0028] A test fixture for a microwave amplifier includes a test platform 1, a convenient clamping mechanism 2 movably connected to the top of the test platform 1, a multi-stage buffer mechanism 3 movably connected to the inner side of the convenient clamping mechanism 2, and a device body 4 movably connected to the inner side of the convenient clamping mechanism 2.

[0029] The convenient clamping mechanism 2 includes a hollow base 21, a buffer component 22, a support base plate 23, a top plate 24, and a clamping component 25. The hollow base 21 is fixedly connected to the top of the detection platform 1. The buffer component 22 is movably connected to the inner side of the hollow base 21. The support base plate 23 is movably connected to the top of the buffer component 22 and the top of the inner side of the hollow base 21. The top plate 24 is fixedly connected to the top of the support base plate 23. The clamping component 25 is movably connected to the top of the support base plate 23 and the outer side of the top plate 24. The device body 4 is located on the top of the top plate 24.

[0030] In this embodiment: By setting a buffer component 22 on the inner side of the hollow base 21, when the device body 4 is conveniently installed on the top of the storage plate 24 for pressure testing via the clamping component 25, the supporting base plate 23 will press down on the buffer component 22 on the inner side of the hollow base 21 to achieve shock absorption, thereby achieving the effect of convenient installation and shock absorption for pressure testing.

[0031] Specifically, such as Figure 1 , Figure 5 As shown, the multi-stage buffer mechanism 3 includes a nested telescopic block 31, a first telescopic rod 32, a first compression spring 33, a buffer block 34, a second telescopic rod 35, and a first tension spring 36.

[0032] Specifically, such as Figure 1 , Figure 5 As shown, the nested telescopic block 31 is movably connected to the outside of the clamping assembly 25, the first telescopic rod 32 is fixedly connected to the left and right sides of the inner side of the nested telescopic block 31, the first compression spring 33 is fixedly connected to the outside of the first telescopic rod 32, the buffer block 34 is fixedly connected to the right side of the left first telescopic rod 32, and the buffer block 34 is fixedly connected to the left side of the right first telescopic rod 32.

[0033] Specifically, such as Figure 1 , Figure 5 As shown, the second telescopic rod 35 is rotatably connected to the outside of the buffer block 34, and the second telescopic rod 35 is rotatably connected to the front and rear sides of the inner side of the nested telescopic block 31. The first tension spring 36 is fixedly connected to the outside of the second telescopic rod 35.

[0034] In this embodiment: when the clamping plate 25a contacts the equipment body 4, the nested telescopic block 31 contacts the equipment body 4 first. The nested telescopic block 31 is composed of two sets of retractable sliding hollow structures nested together. After the clamping plate 25a drives the nested telescopic block 31 to contact the equipment body 4, the larger nested telescopic block 31 slides to the smaller side to close, and the smaller nested telescopic block 31 slides to the outer stroke groove of the clamping plate 25a. When contracting, the inner first telescopic rod 32 and its outer first compression spring 33 contract to store energy, and the outer second telescopic rod 35 and its outer first tension spring 36 of the buffer block 34 stretch to store energy, thereby buffering the contraction. The two sets of nested telescopic blocks 31 are nested with each other to achieve stepped clamping and buffering, avoiding excessive clamping force that could damage the outer shell and electronic components of the equipment body 4, and preventing misjudgment of the pressing detection data and damage to the equipment body 4.

[0035] Specifically, such as Figure 2 , Figure 3 As shown, the buffer assembly 22 includes a telescopic support 22a, a second compression spring 22b, a guide slide 22c, a force-shaping block 22d, a connecting rod 22e, a second tension spring 22f, and a third compression spring 22g.

[0036] Specifically, such as Figure 2 , Figure 3 As shown, the telescopic support column 22a is fixedly connected to the bottom of the inner side of the hollow base 21, the support base plate 23 is fixedly connected to the top of the telescopic support column 22a, the second compression spring 22b is fixedly connected to the outer side of the telescopic support column 22a, the guide slide rod 22c is fixedly connected to the inner side of the hollow base 21, the force distribution block 22d is movably connected to the left and right sides of the outer side of the guide slide rod 22c, the second tension spring 22f is fixedly connected to the right side of the left force distribution block 22d, the second tension spring 22f is fixedly connected to the left side of the right force distribution block 22d, the third compression spring 22g is fixedly connected to the left side of the left force distribution block 22d, the third compression spring 22g is fixedly connected to the right side of the right force distribution block 22d, the left third compression spring 22g is fixedly connected to the left side of the inner side of the hollow base 21, and the right third compression spring 22g is fixedly connected to the right side of the inner side of the hollow base 21.

[0037] In this embodiment: during pressing, the support base plate 23 is gradually pressed down, the bottom telescopic support column 22a and its outer second compression spring 22b contract and store energy. At the same time, the bottom connecting rod 22e of the support base plate 23 rotates and changes angle, pushing the other component force block 22d to slide on the guide slide rod 22c. Since there are two component force blocks 22d, their simultaneous sliding will stretch the second tension spring 22f between the two component force blocks 22d, and press the third compression spring 22g between the two component force blocks 22d and the inner wall of the hollow base 21. This process converts the pressing thrust into multiple sets of multi-directional elastic potential energy and mechanical work, which plays a role in shock absorption and avoids large vibrations from interfering with the reliability and authenticity of the pressing strength test data.

[0038] Specifically, such as Figure 2 , Figure 4 As shown, the clamping assembly 25 includes a clamping plate 25a, a connecting rod 25b, a pull rod 25c, a rotating block 25d, and a drive motor 25e.

[0039] Specifically, such as Figure 2 , Figure 4 As shown, clamping plate 25a is slidably connected to the top of the shelf 24, linkage rod 25b is fixedly connected to the bottom of clamping plate 25a, linkage rod 25b is slidably connected to the bottom of shelf 24, pull rod 25c is rotatably connected to the outside of linkage rod 25b, pull rod 25c is rotatably connected to the outside of rotating block 25d, rotating block 25d is fixedly connected to the output end of drive motor 25e, drive motor 25e is fixedly connected to the top of the inner side of support base plate 23, and nested telescopic block 31 is connected to the outside of clamping plate 25a.

[0040] In this embodiment: by activating the drive motor 25e inside the support base plate 23, the output end rotating block 25d rotates, driving the pull rod 25c connected to the two shafts to move. The pull rod 25c pulls the two sets of connecting rods 25b connected to the other end, causing them to move inward simultaneously. Since the clamping plate 25a is fixed to the connecting rod 25b and is located at the top and bottom of the placement top plate 24 respectively, when the connecting rod 25b moves inward, the clamping plate 25a moves inward synchronously, realizing the clamping and fixing of the device body 4 to be tested. After the test is completed, the drive motor 25e rotates in the opposite direction, which can easily release the limit on the device body 4, realize convenient disassembly and assembly, and effectively reduce preparation and recovery time.

[0041] Specifically, such as Figure 1 As shown, a support base 5 is fixedly connected to the outside of the detection platform 1.

[0042] Specifically, such as Figure 1 As shown, a hydraulic rod 6 is movably connected to the bottom of the inner side of the support base 5, and a pressure detection plate 7 is movably connected to the bottom of the hydraulic rod 6.

[0043] In this example: the hydraulic rod 6 and the pressure testing plate 7 can be supported by the support base 5, and the pressure strength test of the equipment body 4 can be performed by gradually increasing the pressure through the hydraulic rod 6 driving the pressure testing plate 7.

[0044] Working principle: When testing the pressure strength of the microwave amplifier housing, the microwave amplifier device body 4 to be tested is first removed and placed in the center of the top plate 24. Then, the drive motor 25e inside the support base plate 23 is started. The rotating block 25d at the output end of the drive motor 25e begins to rotate, driving the pull rod 25c connected to the two shafts on both sides to move. The pull rod 25c pulls the two sets of connecting rods 25b connected to the other end, causing them to move inward simultaneously. Since the clamping plate 25a is fixedly connected to the connecting rods 25b and is located at the top and bottom of the top plate 24 respectively, when the connecting rods 25b move inward, the clamping plate 25a also moves inward synchronously, thus clamping and fixing the device body 4 to be tested. When the clamping plate 25a contacts the equipment body 4, the nested telescopic block 31 between the contact surfaces of the clamping plate 25a and the equipment body 4 will first contact the equipment body 4. The nested telescopic block 31 is composed of two sets of nested, telescopic, and sliding hollow structures. After the clamping plate 25a drives the nested telescopic block 31 to contact the equipment body 4, the larger nested telescopic block 31 slides to the smaller side to close, while the smaller nested telescopic block 31 slides into the travel groove opened on the outside of the clamping plate 25a. During the synchronous contraction of the two nested telescopic blocks 31, the first telescopic rod 32 located on both sides of the buffer block 34 and connected to the inner walls of the nested telescopic blocks 31, and the first compression spring 33 on the outside of the buffer block 34 contract to accumulate elastic potential energy. The second telescopic rod 35, which is rotatably connected to the inner walls of the nested telescopic block 31 on the outer side, and its outer first tension spring 36 stretch and accumulate elastic potential energy to buffer the contraction of the nested buffer block 34. The two sets of nested telescopic blocks 31 are nested together to achieve stepped clamping and buffering, avoiding excessive clamping force from damaging the outer shell and electronic components of the equipment body 4, preventing misjudgment of pressing test data and damage to the equipment body 4. After fixing is completed, the hydraulic rod 6 at the bottom of the support base 5 is activated, and the pressure is gradually increased through the pressing test plate 7 to test the pressure strength of the outer shell of the equipment body 4. During the pressing process, the support base plate 23 is gradually pressed down, and the telescopic support column 22a at the bottom and its outer second compression spring 22b contract to accumulate elastic potential energy. The connecting rod 22e at the bottom of the supporting base plate 23 rotates to change its angle, pushing the force block 22d on the other side to slide on the guide slide rod 22c. Because there are two sets of force blocks 22d, when they slide at the same time, they will stretch the second tension spring 22f between the two sets of force blocks 22d and press the third compression spring 22g between the two sets of force blocks 22d and the inner wall of the hollow base 21. This converts the pressing force into multiple sets of multi-directional elastic potential energy and mechanical work, which plays a role in shock absorption and avoids large vibrations from interfering with the reliability and authenticity of the pressing strength test data. After the test is completed, the drive motor 25e rotates in the opposite direction, which can easily release the limiting fixation of the equipment body 4, realize convenient disassembly and assembly, and effectively reduce preparation time and recovery time.

[0045] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A test fixture for a microwave amplifier comprising a test platform (1), characterised in that: The top of the detection platform (1) is movably connected with a convenient clamping mechanism (2), the inner side of the convenient clamping mechanism (2) is movably connected with a multi-stage buffer mechanism (3), and the inner side of the convenient clamping mechanism (2) is movably connected with a device body (4). The convenient clamping mechanism (2) comprises a hollow base (21), a buffer assembly (22), a supporting bottom plate (23), a storage top plate (24) and a clamping assembly (25), the hollow base (21) is fixedly connected to the top of the detection platform (1), the buffer assembly (22) is movably connected to the inner side of the hollow base (21), the supporting bottom plate (23) is movably connected to the top of the buffer assembly (22), the supporting bottom plate (23) is movably connected to the top of the inner side of the hollow base (21), the storage top plate (24) is fixedly connected to the top of the supporting bottom plate (23), the clamping assembly (25) is movably connected to the top of the supporting bottom plate (23), the clamping assembly (25) is movably connected to the outer side of the storage top plate (24), and the device body (4) is arranged on the top of the storage top plate (24).

2. A test fixture for a microwave amplifier as claimed in claim 1, characterised in that: The multi-stage buffer mechanism (3) comprises a nested telescopic block (31), a first telescopic rod (32), a first compression spring (33), a buffer block (34), a second telescopic rod (35) and a first tension spring (36).

3. A test fixture for a microwave amplifier as claimed in claim 2, characterised in that: The nested telescopic block (31) is movably connected to the outer side of the clamping assembly (25), the first telescopic rod (32) is fixedly connected to the left side and the right side of the inner side of the nested telescopic block (31), the first compression spring (33) is fixedly connected to the outer side of the first telescopic rod (32), the buffer block (34) is fixedly connected to the right side of the left first telescopic rod (32), and the buffer block (34) is fixedly connected to the left side of the right first telescopic rod (32).

4. A test fixture for a microwave amplifier as recited in claim 2, wherein: The second telescopic rod (35) is rotatably connected to the outer side of the buffer block (34), the second telescopic rod (35) is rotatably connected to the front side and the rear side of the inner side of the nested telescopic block (31), and the first tension spring (36) is fixedly connected to the outer side of the second telescopic rod (35).

5. The test fixture for a microwave amplifier of claim 1, wherein: The buffer assembly (22) comprises a telescopic support (22a), a second compression spring (22b), a guide slide rod (22c), a force block (22d), a connecting rod (22e), a second tension spring (22f) and a third compression spring (22g).

6. A test fixture for a microwave amplifier as claimed in claim 5, characterised in that: The telescopic support column (22a) is fixedly connected to the bottom of the inner side of the hollow base (21), the support bottom plate (23) is fixedly connected to the top of the telescopic support column (22a), the second compression spring (22b) is fixedly connected to the outer side of the telescopic support column (22a), the guide slide rod (22c) is fixedly connected to the inner side of the hollow base (21), the force block (22d) is movably connected to the left and right sides of the outer side of the guide slide rod (22c), the second tension spring (22f) is fixedly connected to the right side of the left force block (22d), the second tension spring (22f) is fixedly connected to the left side of the right force block (22d), the third compression spring (22g) is fixedly connected to the left side of the left force block (22d), the third compression spring (22g) is fixedly connected to the right side of the right force block (22d), and the left third compression spring (22g) is fixedly connected to the left side of the inner side of the hollow base (21). The right third compression spring (22g) is fixedly connected to the right side of the inner side of the hollow base (21).

7. A test fixture for a microwave amplifier as recited in claim 2, wherein: The clamping assembly (25) comprises a clamping plate (25a), a connecting rod (25b), a pull rod (25c), a rotating block (25d) and a driving motor (25e).

8. A test fixture for a microwave amplifier as claimed in claim 7, characterised in that: The clamping plate (25a) is slidingly connected to the top of the storage top plate (24), the connecting rod (25b) is fixedly connected to the bottom of the clamping plate (25a), the connecting rod (25b) is slidingly connected to the bottom of the storage top plate (24), the pull rod (25c) is rotatably connected to the outer side of the connecting rod (25b), the pull rod (25c) is rotatably connected to the outer side of the rotating block (25d), the rotating block (25d) is fixedly connected to the output end of the driving motor (25e), the driving motor (25e) is fixedly connected to the top of the inner side of the support bottom plate (23), and the nested telescopic block (31) is connected to the outer side of the clamping plate (25a).

9. The test fixture for a microwave amplifier of claim 1, wherein: The outer side of the detection platform (1) is fixedly connected with a support pedestal (5).

10. A test fixture for a microwave amplifier as claimed in claim 9, characterised in that: The inner side of the support pedestal (5) is movably connected with a hydraulic rod (6), and the bottom of the hydraulic rod (6) is movably connected with a pressing detection plate (7).

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