Testing device for broadband measuring device

Abstract

The utility model relates to the technical field of broadband measurement, and discloses a testing device for a broadband measuring device, which comprises a platform, clamping pieces are arranged at the two ends of the top of the platform, a contact block is arranged on one side of each clamping piece, a double-shaft motor is fixedly mounted in the platform, and the double-shaft motor is connected with the platform. When the broadband measuring device is tested, the broadband measuring device is placed on the platform, then the double-shaft motor is operated, the clamping piece is made to move, the clamping piece drives the contact block to get close to the broadband measuring device, and then the broadband measuring device is placed on the platform. The contact block guarantees the protection of the broadband measuring device, and the interior of the fixing ring is used for fixing the test part, so that the test part is matched with the broadband measuring device for testing, the test part is convenient to mount and dismount, the use flexibility is improved, the device is convenient to cooperate with the broadband measuring device for rapid fixation, and the test efficiency is improved. And the stability and the convenience during testing are improved.

Description

Technical Field

[0001] The present application relates to the technical field of broadband measurement, and in particular to a testing device for a broadband measurement device. Background Art

[0002] With the large-scale commissioning of new energy and DC transmission, the characteristics of the power grid have changed, and non-power frequency energy ranging from several Hz to thousands of Hz has been introduced. The existing measurement system based on RTU and PMU cannot provide effective monitoring means and sufficient analysis data. Broadband measurement expands the measurement range from 50Hz power frequency to 0-2500Hz, and real-time measurement and monitoring of power grid (inter) harmonics, synchronous phasors and various power oscillations. Based on the concept of edge computing, broadband data collection, storage and analysis are carried out at the substation end, and the measurement data and analysis results are transmitted to the main station. Broadband measurement devices can be deployed at new energy, traction loads, DC transmission, and flexible AC transmission connection points to enhance the grid perception capability, prevent oscillation risks, and build a more accurate power electronic grid model and analysis system based on measured data. In the production of broadband measurement devices, test devices are needed to test and detect broadband measurement devices to ensure the normal use of broadband measurement devices. At present, the testing of broadband measurement devices is mostly manual operation, which has some inconveniences and low operational flexibility. Utility Model Content

[0003] The utility model provides a testing device for a broadband measuring device, which solves the technical problems that in the existing broadband measuring device test, most of the tests are performed manually, resulting in inconvenient testing and low operational flexibility.

[0004] The present application provides a testing device for a broadband measuring device, comprising a platform, wherein an upper end surface of the platform is provided with a clamping member suitable for clamping the broadband measuring device;

[0005] The platform is provided with a clamping member driving mechanism that is slidably connected with the clamping member, and the clamping member driving mechanism is connected to the clamping member;

[0006] The upper end surface of the platform is provided with a bracket;

[0007] An electric telescopic rod is fixedly sleeved inside the bracket, and an output end of the electric telescopic rod is fixedly connected to a top plate;

[0008] The top plate is provided with a fixing ring, and a contact piece abutting against the test component is provided inside the fixing ring;

[0009] A support driving mechanism that is slidably connected with the support is arranged inside the platform, and the bottom of the support is connected with the support driving mechanism.

[0010] Optionally, a contact block is provided on one side of the clamping member.

[0011] Optionally, a telescopic rod is fixedly mounted inside the clamp and on one side of the contact block;

[0012] The surface of the telescopic rod is sleeved with a spring;

[0013] One end of the spring is connected to the inside of the clamp;

[0014] The other end of the spring is connected to one side of the contact block.

[0015] Optionally, the clamping member driving mechanism comprises a dual-axis motor, a first screw and a first threaded block;

[0016] The dual-axis motor is installed inside the platform;

[0017] The output end of the dual-shaft motor is fixedly sleeved with the first screw via a coupling;

[0018] The surface of the first screw rod is threadedly connected with the first threaded block fixedly connected to the clamping member.

[0019] Optionally, a first sliding block is fixedly mounted on the bottom of the first threaded block;

[0020] The inner bottom end of the platform is provided with a first sliding groove which is slidably connected with the first sliding block.

[0021] Optionally, both ends of the top of the bracket are provided with guide rods penetrating to the top of the top plate;

[0022] A guide hole is provided inside the top plate for the guide rod to pass through.

[0023] Optionally, the test component is provided on the inner side of the fixing ring.

[0024] Optionally, one side of the contact piece is rotatably connected to a bolt penetrating to the outside of the fixing ring via a bearing;

[0025] The bolt and the fixing ring are threadedly connected to each other, and a knob is fixedly mounted on one end of the bolt away from the contact piece.

[0026] Optionally, the support driving mechanism includes a rotary motor, a second screw rod and a second threaded block;

[0027] The rotating motor is installed inside the platform;

[0028] The output end of the rotary motor is fixedly sleeved with the second screw via a coupling;

[0029] The surface of the second screw rod is threadedly connected with the second threaded block fixedly connected to the bracket.

[0030] Optionally, a second sliding block is fixedly mounted on the bottom of the second threaded block;

[0031] The inner bottom end of the platform is provided with a second sliding groove which is slidably connected with the second sliding block.

[0032] It can be seen from the above technical solutions that the embodiments of the utility model have the following advantages:

[0033] 1. When testing the broadband measuring device, place the broadband measuring device on the platform, and then run the dual-axis motor to move the clamping member, which drives the contact block to approach the broadband measuring device, and the contact block ensures the protection of the broadband measuring device. At the same time, the inside of the fixing ring is used to fix the test component, so that the test component can be used in conjunction with the broadband measuring device for testing. At the same time, it is convenient to install and disassemble the test component, which increases the flexibility of use. The device is convenient for quick fixation in conjunction with the broadband measuring device, which increases the stability and convenience during testing.

[0034] 2. When testing the broadband measuring device, the test component can be driven by the operation of the electric telescopic rod to move the fixed ring and the test component, thereby realizing the longitudinal movement of the test component to cooperate with the broadband test device for testing. At the same time, the test component can be driven by the operation of the rotating motor to move horizontally on the platform, which is conducive to providing convenience for testing the broadband test device while ensuring flexible use. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 A schematic structural diagram of a test device for a broadband measurement device provided in an embodiment of the present application;

[0037] Figure 2 A schematic cross-sectional view of the rear side of the platform provided in an embodiment of the present application;

[0038] Figure 3 A right side schematic diagram of a test device for a broadband measurement device provided in an embodiment of the present application;

[0039] Figure 4A schematic front cross-sectional view of a test device for a broadband measurement device provided in an embodiment of the present application;

[0040] Figure 5 A schematic top view of a fixing ring provided in an embodiment of the present application.

[0041] The reference numerals are as follows:

[0042] 1. Platform; 2. Clamping piece; 3. Contact block; 4. Spring; 5. Telescopic rod; 6. Dual-axis motor; 7. First screw rod; 8. First threaded block; 9. First slider; 10. First slide groove; 11. Bracket; 12. Electric telescopic rod; 13. Top plate; 14. Fixing ring; 15. Guide rod; 16. Contact piece; 17. Knob; 18. Bolt; 19. Rotating motor; 20. Second screw rod; 21. Second slider; 22. Second slide groove; 23. Second threaded block; 24. Test component. DETAILED DESCRIPTION

[0043] The utility model provides a testing device for a broadband measuring device, which solves the technical problems that in the existing broadband measuring device test, most of the tests are performed manually, resulting in inconvenient testing and low operational flexibility.

[0044] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] For easier understanding, see Figure 1-5 , a test device for a broadband measuring device provided in an embodiment of the present application comprises a platform 1, characterized in that a clamping member 2 suitable for clamping the broadband measuring device is provided on the upper end surface of the platform 1;

[0046] A clamping member driving mechanism that is slidably connected to the clamping member 2 is disposed inside the platform 1, and the clamping member driving mechanism is connected to the clamping member 2;

[0047] The upper end surface of the platform 1 is provided with a bracket 11;

[0048] The inside of the bracket 11 is fixedly sleeved with an electric telescopic rod 12, and the output end of the electric telescopic rod 12 is fixedly connected to a top plate 13;

[0049] The top plate 13 is provided with a fixing ring 14, and a contact piece 16 is provided inside the fixing ring 14 to abut against the test component 24;

[0050] A support driving mechanism that is slidably connected to the support 11 is disposed inside the platform 1 , and the bottom of the support 11 is connected to the support driving mechanism.

[0051] In the embodiment of the present application, when testing the broadband measuring device, the broadband measuring device is placed on the platform 1, and the clamping member 2 is driven by the clamping member driving mechanism to move and guide, and is clamped close to the broadband measuring device. The electric telescopic rod 12 is arranged inside the bracket 11, so that the test component 24 fixed on the inner side of the fixing ring 14 is moved longitudinally. At the same time, the bracket 11 is driven by the bracket driving mechanism to move laterally, which is beneficial to provide convenience for testing the broadband test device while ensuring flexible use.

[0052] It should be noted that the operation of the electric telescopic rod 12 will drive the top plate 13 to move longitudinally.

[0053] See also Figure 1-Figure 2 As shown, a contact block 3 is provided on one side of the clamping member 2. A telescopic rod 5 is fixedly installed inside the clamping member 2 and on one side of the contact block 3;

[0054] The surface of the telescopic rod 5 is sleeved with a spring 4;

[0055] One end of the spring 4 is connected to the inside of the clamp 2;

[0056] The other end of the spring 4 is connected to one side of the contact block 3 .

[0057] In the embodiment of the present application, the telescopic rod 5 and the spring 4 cooperate with the clamping member 2 and the contact block 3 to perform contraction and extension.

[0058] See also Figure 2 As shown, the clamping member driving mechanism includes a dual-axis motor 6, a first screw 7 and a first threaded block 8;

[0059] A dual-axis motor 6 is installed inside the platform 1;

[0060] The output end of the dual-shaft motor 6 is fixedly sleeved with a first screw 7 via a coupling;

[0061] A first threaded block 8 fixedly connected to the clamping member 2 is threadedly connected on the surface of the first screw rod 7 .

[0062] A first sliding block 9 is fixedly mounted on the bottom of the first threaded block 8;

[0063] A first sliding groove 10 is provided at the inner bottom of the platform 1 to be slidably connected with the first sliding block 9 .

[0064] In the embodiment of the present application, when testing the broadband measuring device, the broadband measuring device is placed on the platform 1, and then the dual-axis motor 6 is operated, so that the operation of the dual-axis motor 6 drives the first screw 7 to rotate, thereby causing the first threaded block 8 to drive the clamping member 2 to move, and the first slider 9 is slidably connected to the first slide groove 10, and cooperates with the first threaded block 8 to guide the movement, and the clamping member 2 drives the contact block 3 to approach the broadband measuring device, and the telescopic rod 5 and the spring 4 cooperate with the broadband measuring device for buffering protection, thereby ensuring the protectiveness of the contact block 3 to the broadband measuring device, and at the same time, the interior of the fixing ring 14 is used to fix the test component 24, and the test component 24 is placed on the contact The contact member 16 is inside the test component 24, and then the bolt 18 is driven to rotate by the knob 17, so that the bolt 18 is progressively advanced inside the fixing ring 14. At this time, the contact member 16 is moved, so that the test component 24 is used in conjunction with the broadband measuring device for testing. At the same time, it is convenient to install and disassemble the test component 24, which increases the flexibility of use. Through this device, it is convenient to quickly fix the broadband measuring device, which increases the stability and convenience during testing. At the same time, the test component 24 can be driven by the operation of the electric telescopic rod 12 to move the fixing ring 14 and the test component 24, thereby realizing the longitudinal movement of the test component 24, so as to cooperate with the broadband testing device for testing.

[0065] See also Figure 3-Figure 4 As shown, both ends of the top of the bracket 11 are provided with guide rods 15 that penetrate to the top of the top plate 13;

[0066] A guide hole is formed inside the top plate 13 for the guide rod 15 to pass through.

[0067] In the embodiment of the present application, the guide rod 15 and the guide hole cooperate with the movement of the top plate 13 to provide guidance.

[0068] See also Figure 5 As shown, a test component 24 is provided on the inner side of the fixing ring 14 .

[0069] One side of the contact member 16 is rotatably connected to a bolt 18 penetrating to the outside of the fixing ring 14 through a bearing;

[0070] The bolt 18 and the fixing ring 14 are threadedly connected to each other, and a knob 17 is fixedly mounted on one end of the bolt 18 away from the contact piece 16 .

[0071] In the embodiment of the present application, the rotation of the knob 17 will drive the bolt 18 to rotate, so that the bolt 18 is progressively advanced inside the fixing ring 14, and at this time the contact member 16 is moved.

[0072] See also Figure 1 and Figure 4 As shown, the support driving mechanism includes a rotary motor 19, a second screw rod 20 and a second threaded block 23;

[0073] A rotary motor 19 is installed inside the platform 1;

[0074] The output end of the rotary motor 19 is fixedly sleeved with a second screw 20 via a coupling;

[0075] A second threaded block 23 fixedly connected to the bracket 11 is threadedly connected on the surface of the second screw rod 20 .

[0076] A second sliding block 21 is fixedly mounted on the bottom of the second threaded block 23;

[0077] A second sliding groove 22 is provided at the inner bottom of the platform 1 to be slidably connected with the second sliding block 21 .

[0078] In the embodiment of the present application, the second screw rod 20 is driven to rotate by the operation of the rotating motor 19, so that the second threaded block 23 drives the bracket 11 to achieve lateral movement, and the second slider 21 and the second slide groove 22 cooperate with the second threaded block 23 to move and guide. The bracket 11 will synchronously drive the electric telescopic rod 12, the top plate 13, the fixing ring 14 and the test component 24 to move laterally on the platform 1, which is beneficial to provide convenience for testing the broadband test device while ensuring flexible use.

[0079] For ease of understanding, the following specific embodiments are provided:

[0080] Embodiment 1:

[0081] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5A test device for a broadband measuring device comprises a platform 1, a clamping member 2 is provided at both ends of the top of the platform 1, a contact block 3 is provided on one side of the clamping member 2, a dual-axis motor 6 is fixedly installed inside the platform 1, a first screw rod 7 is fixedly sleeved on the output end of the dual-axis motor 6 through a coupling, a first threaded block 8 fixedly connected to the clamping member 2 is threadedly connected on the surface of the first screw rod 7, a fixing ring 14 is provided on the top of the platform 1, a test component 24 is provided on the inner side of the fixing ring 14, and contact members contacting the surface of the test component 24 are provided on both sides of the inside of the fixing ring 14 16, a telescopic rod 5 is fixedly installed inside the clamp 2 and one side of the contact block 3, a spring 4 is sleeved on the surface of the telescopic rod 5, and the telescopic rod 5 and the spring 4 cooperate with the clamp 2 and the contact block 3 to retract and extend, a first slider 9 is fixedly installed at the bottom of the first threaded block 8, a first slide groove 10 is provided inside the platform 1 to be slidably connected with the first slider 9, the first slider 9 is slidably connected with the first slide groove 10, and cooperates with the first threaded block 8 to move and guide, and both ends of the top of the bracket 11 are provided with guide rods 15 that penetrate to the top of the top plate 13, and the top A guide hole is provided inside the plate 13 for the guide rod 15 to pass through. The guide rod 15 and the guide hole cooperate with the movement of the top plate 13 to guide. One side of the contact member 16 is rotatably connected to a bolt 18 that passes through the outside of the fixing ring 14 through a bearing. The bolt 18 and the fixing ring 14 are threadedly connected to each other. A knob 17 is fixedly installed on one end of the bolt 18. The rotation of the knob 17 will drive the bolt 18 to rotate, so that the bolt 18 can be progressively advanced inside the fixing ring 14. At this time, the movement of the contact member 16 is realized. When testing the broadband measurement device, The broadband measuring device is placed on the platform 1, and then the dual-axis motor 6 is operated to move the clamp 2, and the clamp 2 drives the contact block 3 to approach the broadband measuring device, and the contact block 3 ensures the protection of the broadband measuring device. At the same time, the interior of the fixing ring 14 is used to fix the test component 24, so that the test component 24 can be used for testing in conjunction with the broadband measuring device, and at the same time, it is convenient to install and disassemble the test component 24, thereby increasing the flexibility of use. Through this device, it is convenient to quickly fix in conjunction with the broadband measuring device, thereby increasing the stability and convenience during testing.

[0082] Brief description of the use process: When testing the broadband measuring device, the broadband measuring device is placed on the platform 1, and then the dual-axis motor 6 is operated, so that the operation of the dual-axis motor 6 drives the first screw 7 to rotate, so that the first threaded block 8 drives the clamping member 2 to move, and the first slider 9 is slidably connected to the first slide groove 10, and cooperates with the first threaded block 8 to guide the movement, and the clamping member 2 drives the contact block 3 to approach the broadband measuring device, and the telescopic rod 5 and the spring 4 cooperate with the broadband measuring device for buffering protection to ensure the protection of the contact block 3 to the broadband measuring device. At the same time, the interior of the fixing ring 14 is used to fix the test component 24, and the test component 24 is placed inside the contact member 16, and then the knob 17 drives the bolt 18 to rotate, so that the bolt 18 is progressively advanced inside the fixing ring 14, and the movement of the contact member 16 is realized at this time, so that the test component 24 is used for testing with the broadband measuring device, and at the same time, it is convenient to install and disassemble the test component 24, which increases the flexibility of use. Through this device, it is convenient to quickly fix with the broadband measuring device, and increase the stability and convenience during testing.

[0083] Embodiment 2:

[0084] refer to Figure 1 , Figure 3 and Figure 4 A test device for a broadband measuring device comprises a platform 1, a bracket 11 is provided at the rear side of the top, an electric telescopic rod 12 is fixedly sleeved inside the bracket 11, a rotary motor 19 is fixedly installed inside the platform 1, a second screw 20 is fixedly sleeved at the output end of the rotary motor 19 through a coupling, a second threaded block 23 fixedly connected to the bracket 11 is threadedly connected on the surface of the second screw 20, a top plate 13 fixedly connected to a fixing ring 14 is fixedly connected to the output end of the electric telescopic rod 12, a second slider 21 is fixedly installed at the bottom of the second threaded block 23, and a second slider 21 is slidably connected to the second slider 21. The second slide groove 22 and the operation of the electric telescopic rod 12 will drive the top plate 13 to move longitudinally, and the second slider 21 and the second slide groove 22 cooperate with the second threaded block 23 to move and guide. When testing the broadband measuring device, the test component 24 can drive the fixing ring 14 and the test component 24 to move through the operation of the electric telescopic rod 12, thereby realizing the longitudinal movement of the test component 24 to cooperate with the broadband testing device for testing. At the same time, the test component 24 can be driven to move horizontally on the platform 1 through the operation of the rotating motor 19, which is beneficial to provide convenience for testing the broadband testing device while ensuring flexible use.

[0085] Brief description of the usage process: When testing the broadband measuring device, the test component 24 can drive the fixing ring 14 and the test component 24 to move through the operation of the electric telescopic rod 12, thereby realizing the longitudinal movement of the test component 24 to cooperate with the broadband testing device for testing. At the same time, the second screw rod 20 can be driven to rotate by the operation of the rotating motor 19, so that the second threaded block 23 drives the bracket 11 to achieve lateral movement. The second slider 21 and the second slide groove 22 cooperate with the second threaded block 23 to move and guide. The bracket 11 will synchronously drive the electric telescopic rod 12, the top plate 13, the fixing ring 14 and the test component 24 to move laterally on the platform 1, which is conducive to providing convenience for testing the broadband testing device while ensuring flexible use.

[0086] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0087] Finally, it should be noted that in this article, relational terms such as first and second, etc.

[0088] It is only used to distinguish one entity or operation from another entity or operation, and does not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0089] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the records and scope of the technical solutions of the embodiments of the present application.

Claims

1. A test device for a broadband measurement device, comprising a platform (1), characterized in that: The upper end surface of the platform (1) is provided with a clamping member (2) suitable for clamping a broadband measuring device; A clamping member driving mechanism is provided inside the platform (1) and is slidably connected to the clamping member (2), and the clamping member driving mechanism is connected to the clamping member (2); The upper end surface of the platform (1) is provided with a bracket (11); An electric telescopic rod (12) is fixedly sleeved inside the bracket (11), and an output end of the electric telescopic rod (12) is fixedly connected to a top plate (13); The top plate (13) is provided with a fixing ring (14), and a contact piece (16) abutting against a test component (24) is provided inside the fixing ring (14); A support driving mechanism that is slidably connected to the support (11) is provided inside the platform (1), and the bottom of the support (11) is connected to the support driving mechanism.

2. The test device for a broadband measurement device according to claim 1, characterized in that: A contact block (3) is provided on one side of the clamping member (2).

3. The test device for a broadband measurement device according to claim 2, characterized in that: A telescopic rod (5) is fixedly mounted inside the clamping member (2) and on one side of the contact block (3); A spring (4) is sleeved on the surface of the telescopic rod (5); One end of the spring (4) is connected to the inside of the clamping member (2); The other end of the spring (4) is connected to one side of the contact block (3).

4. The test device for a broadband measurement device according to claim 1, characterized in that: The clamping member driving mechanism comprises a dual-axis motor (6), a first screw rod (7) and a first threaded block (8); The dual-axis motor (6) is installed inside the platform (1); The output end of the dual-shaft motor (6) is fixedly sleeved with the first screw rod (7) via a coupling; The surface of the first screw rod (7) is threadedly connected to the first threaded block (8) which is fixedly connected to the clamping member (2).

5. The test device for a broadband measurement device according to claim 4, characterized in that: A first sliding block (9) is fixedly mounted on the bottom of the first threaded block (8); The inner bottom end of the platform (1) is provided with a first sliding groove (10) which is slidably connected with the first sliding block (9).

6. The test device for a broadband measurement device according to claim 1, characterized in that: Both ends of the top of the bracket (11) are provided with guide rods (15) penetrating to the top of the top plate (13); A guide hole is provided inside the top plate (13) and is adapted to fit the guide rod (15).

7. The test device for a broadband measurement device according to claim 1, characterized in that: The test component (24) is arranged on the inner side of the fixing ring (14).

8. The test device for a broadband measurement device according to claim 7, characterized in that: One side of the contact member (16) is rotatably connected to a bolt (18) penetrating the outside of the fixing ring (14) via a bearing; The bolt (18) and the fixing ring (14) are threadedly connected to each other, and a knob (17) is fixedly mounted on one end of the bolt (18) away from the contact member (16).

9. The test device for a broadband measurement device according to claim 1, characterized in that: The support driving mechanism comprises a rotary motor (19), a second screw rod (20) and a second threaded block (23); The rotating motor (19) is installed inside the platform (1); The output end of the rotary motor (19) is fixedly sleeved with the second screw rod (20) via a coupling; The surface of the second screw rod (20) is threadedly connected to the second threaded block (23) which is fixedly connected to the bracket (11).

10. The test device for a broadband measurement device according to claim 9, characterized in that: A second sliding block (21) is fixedly mounted on the bottom of the second threaded block (23); A second sliding groove (22) is provided at the inner bottom end of the platform (1) and is slidably connected to the second sliding block (21).

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