A clamping fixture suitable for machine tool workbench

Abstract

The utility model discloses a clamp-type fixture suitable for a machine tool workbench, comprising a mounting seat, a fixed plate is provided above the mounting seat, the fixed plate is rotatably connected to the mounting seat through a mounting shaft, a gear is sleeved on the mounting shaft, a rack is provided in the mounting seat, two groups of symmetrically distributed clamping rods are provided in the mounting seat, two groups of symmetrically distributed bidirectional screws are provided in the mounting seat, a fixed seat is provided in the mounting seat, a roller brush is provided on the fixed seat, the roller brush is provided corresponding to the fixed plate, a sweeping brush is provided on the fixed seat, and the sweeping brush is fitted with the roller brush. This clamp-type fixture suitable for a machine tool workbench can realize the flipping of the fixture as a whole and the cleaning of the surface by providing a fixed plate and a roller brush, so as to avoid the iron filings and the like generated during the parts processing process from adhering to the fixture surface and being difficult to clean, resulting in damage to the fixture and the parts, and the automatic cleaning method can also reduce the input of manpower.

Description

Technical Field

[0001] The utility model belongs to the technical field of machine tool fixtures, and in particular relates to a clamping fixture suitable for a machine tool workbench. Background Art

[0002] CNC machine tool is the abbreviation of digital control machine tool. It is an automated machine tool equipped with a program control system. The control system can logically process programs specified by control codes or other symbolic instructions, decode them, and express them in coded numbers. The information carrier is input into the CNC device, and the CNC device sends various control signals after calculation and processing to control the movement of the machine tool. It automatically processes parts according to the shape and size required by the drawing. When processing products, CNC machine tools need to use fixtures to fix the processed parts so that they occupy the correct position to accept construction or testing. The device is also called a fixture.

[0003] The machine tool clamp-type fixtures currently on the market will have a large amount of iron filings and waste adhered to the fixture during the process of fixing the processed parts for processing, which is not easy to clean. The iron filings adhered to the fixture will not only damage the fixture but also cause a certain degree of wear and tear on the surface of the part during the next clamp fixing process. Manually disassembling the fixture for cleaning is not only time-consuming and labor-intensive, but the iron filings adhered to the fixture can also easily cause hand injuries to the staff. Utility Model Content

[0004] The utility model aims to provide a clamping fixture suitable for a machine tool workbench to solve the technical problems raised in the background technology.

[0005] To achieve the above-mentioned objectives, the specific technical scheme of the utility model is as follows: A clamp-type fixture suitable for a machine tool workbench, comprising a mounting seat, a fixed plate is provided above the mounting seat, the fixed plate is rotatably connected to the mounting seat through a mounting shaft, a gear is sleeved on the mounting shaft, a rack is provided in the mounting seat, the rack is meshed with the gear, the rack is slidably connected to the mounting seat, a cylinder is provided in the mounting seat, the rack is connected to the output end of the cylinder piston rod, two groups of symmetrically distributed clamping rods are provided in the mounting seat, two groups of symmetrically distributed bidirectional screw rods are provided in the mounting seat, a fixed seat is provided in the mounting seat, a roller brush is provided on the fixed seat, the roller brush is arranged corresponding to the fixed plate, a sweeping brush is provided on the fixed seat, and the sweeping brush is in contact with the roller brush.

[0006] Preferably, the fixed plate is provided with two groups of symmetrically distributed clamping blocks, the fixed plate is provided with a bidirectional screw, both ends of the bidirectional screw respectively pass through the two groups of clamping blocks and are threadedly connected to the clamping blocks, both ends of the bidirectional screw respectively pass through the fixed plate and are rotatably connected to the fixed plate, a first adjusting block is provided in the clamping block, two groups of symmetrically distributed second adjusting blocks are provided in the first adjusting block, two groups of symmetrically distributed third adjusting blocks are provided in each of the two groups of the second adjusting blocks, sliding grooves are provided in the clamping block, and sliders are provided behind the first adjusting block, the second adjusting block and the third adjusting block.

[0007] Preferably, the two groups of the clamping rods are respectively slidably connected to the mounting seat, the two groups of the clamping rods are respectively movably clamped with the two sides of the fixed plate, the two ends of the bidirectional screw rod respectively pass through the mounting seat and are rotatably connected with the mounting seat, the two ends of the bidirectional screw rod respectively pass through the two groups of clamping rods and are threadedly connected with the clamping rod, the left ends of the two groups of the bidirectional screw rods are both sleeved with synchronous wheels, and a synchronous belt is provided in the mounting seat, and the synchronous belt is respectively transmission-connected with the two groups of synchronous wheels.

[0008] Preferably, a fixing rod is provided on the fixing seat, and a moving block is provided on the sweeping brush. The moving block is slidably sleeved on the fixing rod. A spring is sleeved on the fixing rod. Both ends of the spring are respectively fixedly connected to the moving block and the fixing seat. A cam is provided on the fixing seat. The cam is rotatably connected to the fixing seat through a rotating shaft, and the cam is fitted with the moving block.

[0009] Preferably, a mounting seat is provided with a mounting rod, a first adjusting rod is provided in the mounting rod, a second adjusting rod is provided in the first adjusting rod, the left end of the second adjusting rod is fixedly connected to the fixing seat, a threaded rod is provided in the mounting rod, a threaded tube is provided in the first adjusting rod, the threaded rod is rotatably connected to the mounting rod through a bearing, and the threaded tube is rotatably connected to the first adjusting rod through a bearing.

[0010] Preferably, the threaded rod passes through the first adjusting rod and is threadedly connected to the first adjusting rod, the threaded tube passes through the second adjusting rod and is threadedly connected to the second adjusting rod, the threaded rod is provided with two groups of symmetrically distributed limit grooves, the threaded tube is provided with two groups of symmetrically distributed limit blocks, the limit blocks are arranged corresponding to the limit grooves, and the threaded tube is slidably sleeved with the threaded rod through the limit blocks.

[0011] The utility model has the following advantages:

[0012] 1. This clamp-type fixture is suitable for the workbench of a machine tool. By setting a fixed plate and a roller brush, the entire fixture can be turned over and the surface can be cleaned, so that iron filings generated during the processing of parts are prevented from adhering to the surface of the fixture and being difficult to clean, resulting in damage to the fixture and parts. At the same time, the automatic cleaning method can also reduce the input of manpower. After the processing of the parts clamped by the fixture is completed, the cylinder is started to drive the rack to slide, and the gear meshing with the rack drives the installation shaft to rotate 180 degrees to complete the turning of the fixed plate and the clamping block. The large pieces of iron filings on the fixed plate fall into the mounting seat, and the motor in the mounting rod is started to drive the threaded rod to rotate, and the limit block and the limit groove are operated. The first adjusting rod and the second adjusting rod are used to drive the fixed seat to move, and the roller brush brushes the surface of the fixed plate. The fixed seat drives the roller brush to move forward and the roller brush rotates synchronously to clean the surface of the fixed plate, and the iron filings remaining on the surface of the fixture are cleaned. At the same time, the cam is driven to rotate under the action of the motor, and the moving block is pushed intermittently. The slider pushes and squeezes the spring at the same time, so that the moving block drives the sweeping brush to move back and forth, and the iron filings attached to the surface of the roller brush are cleaned to avoid the iron filings adhering to the roller brush and affecting the cleaning effect of the fixture. The function of the two sets of clamping rods is to limit and stabilize the horizontal position of the fixed plate to ensure the stability of the parts clamping;

[0013] 2. This clamping fixture suitable for a machine tool workbench can clamp special-shaped parts through the first adjusting block, the third adjusting block and the second adjusting block, thereby expanding the application range of the fixture and ensuring the stability of the fixture; through the slider and the slide groove, the first adjusting block can slide on the clamping block, the second adjusting block can slide on the first adjusting block, and the third adjusting block can slide on the second adjusting block; under the action of the bidirectional screw, the two groups of clamping blocks drive the first adjusting block, the second adjusting block and the third adjusting block to gradually contact and extrude the parts during the process of advancing; according to the shape of the special-shaped parts, the first adjusting block, the second adjusting block and the third adjusting block all make corresponding position changes, so that the fixture fits the shape of the parts as much as possible, thereby ensuring stable clamping of the special-shaped parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the fixing plate of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the clamping rod of the utility model;

[0018] Figure 4 For the utility model Figure 3 A magnified view of the structure at center A;

[0019] Figure 5 It is a structural schematic diagram of the clamping block of the utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the roller brush of the utility model;

[0021] Figure 7 For the utility model Figure 6 A magnified view of the structure at point B.

[0022] Explanation of the markings in the figure: 1. Mounting seat; 2. Fixed plate; 3. Mounting shaft; 4. Gear; 5. Rack; 6. Cylinder; 7. Clamping rod; 8. Bidirectional lead screw; 9. Synchronous wheel; 10. Synchronous belt; 11. Clamping block; 12. Bidirectional screw; 13. First adjusting block; 14. Second adjusting block; 15. Third adjusting block; 16. Slide groove; 17. Sliding block; 18. Mounting rod; 19. First adjusting rod; 20. Second adjusting rod; 21. Threaded rod; 22. Threaded tube; 23. Limiting groove; 24. Limiting block; 25. Fixed seat; 26. Roller brush; 27. Fixed rod; 28. Sweeping brush; 29. ​​Moving block; 30. Spring; 31. Cam. DETAILED DESCRIPTION

[0023] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0024] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0027] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0028] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of a clamp-type fixture suitable for a machine tool workbench of the utility model in conjunction with the accompanying drawings.

[0029] like Figure 1-7As shown, the utility model is a clamping fixture suitable for a machine tool workbench, comprising a mounting seat 1, a fixing plate 2 is arranged above the mounting seat 1, the fixing plate 2 is rotatably connected to the mounting seat 1 through a mounting shaft 3, a gear 4 is sleeved on the mounting shaft 3, a rack 5 is arranged inside the mounting seat 1, the rack 5 is meshed with the gear 4, the rack 5 is slidably connected to the mounting seat 1, a cylinder 6 is arranged inside the mounting seat 1, the rack 5 is connected to the output end of the piston rod of the cylinder 6, two groups of symmetrically distributed clamping rods 7 are arranged inside the mounting seat 1, and two groups of symmetrically distributed clamping rods 7 are arranged inside the mounting seat 1. A bidirectional screw rod 8 of the cloth is provided, and a fixed seat 25 is provided in the mounting seat 1. A roller brush 26 is provided on the fixed seat 25. The roller brush 26 is arranged corresponding to the fixed plate 2. A sweeping brush 28 is provided on the fixed seat 25. The sweeping brush 28 is fitted with the roller brush 26. By arranging the fixed plate 2 and the roller brush 26, the overall flipping of the fixture and the cleaning of the surface are achieved, which avoids the iron filings generated during the parts processing from adhering to the fixture surface and being difficult to clean, resulting in damage to the fixture and parts. At the same time, the automatic cleaning method can also reduce the labor input.

[0030] Two groups of symmetrically distributed clamping blocks 11 are provided on the fixed plate 2, and a bidirectional screw 12 is provided on the fixed plate 2. The two ends of the bidirectional screw 12 respectively penetrate the two groups of clamping blocks 11 and are threadedly connected with the clamping blocks 11, and the two ends of the bidirectional screw 12 respectively penetrate the fixed plate 2 and are rotatably connected with the fixed plate 2. A first adjusting block 13 is provided in the clamping block 11, and two groups of symmetrically distributed second adjusting blocks 14 are provided in the first adjusting block 13, and two groups of symmetrically distributed third adjusting blocks 15 are provided in the two groups of second adjusting blocks 14. Slide grooves 16 are provided in the clamping block 11, the first adjusting block 13 and the second adjusting block 14, and sliders 17 are provided behind the first adjusting block 13, the second adjusting block 14 and the third adjusting block 15. The first adjusting block 13, the third adjusting block 15 and the second adjusting block 14 are provided to clamp special-shaped parts, expand the scope of application of the clamp, and ensure the stability of the clamp.

[0031] The two groups of clamping rods 7 are respectively slidably connected to the mounting seat 1, and the two groups of clamping rods 7 are respectively movably clamped with the two sides of the fixed plate 2, and the two ends of the bidirectional screw rod 8 respectively penetrate the mounting seat 1 and are rotatably connected with the mounting seat 1, and the two ends of the bidirectional screw rod 8 respectively penetrate the two groups of clamping rods 7 and are threadedly connected with the clamping rod 7, and the left ends of the two groups of bidirectional screw rods 8 are sleeved with synchronous wheels 9, and the mounting seat 1 is provided with a synchronous belt 10, which is respectively connected to the two groups of synchronous wheels 9 for transmission. By moving the position of the two groups of clamping rods 7, the fixing and release of the fixed plate 2 are realized, thereby ensuring the stability of the clamp and the stability of the parts fixation.

[0032] A fixing rod 27 is provided on the fixing seat 25, and a moving block 29 is provided on the sweeping brush 28. The moving block 29 is slidably sleeved with the fixing rod 27. A spring 30 is sleeved on the fixing rod 27. Both ends of the spring 30 are fixedly connected to the moving block 29 and the fixing seat 25 respectively. A cam 31 is provided on the fixing seat 25. The cam 31 is rotatably connected to the fixing seat 25 through a rotating shaft. The cam 31 fits with the moving block 29. The cam 31 is driven to rotate by the action of the motor, and the moving block 29 is pushed intermittently. The slider 17 pushes and squeezes the spring 30 at the same time, so that the moving block 29 drives the sweeping brush 28 to move back and forth, and the iron filings attached to the surface of the roller brush 26 are cleaned to prevent the iron filings adhering to the roller brush 26 from affecting the cleaning effect of the fixture.

[0033] A mounting rod 18 is provided on the mounting seat 1, a first adjusting rod 19 is provided inside the mounting rod 18, a second adjusting rod 20 is provided inside the first adjusting rod 19, the left end of the second adjusting rod 20 is fixedly connected to the fixing seat 25, a threaded rod 21 is provided inside the mounting rod 18, a threaded tube 22 is provided inside the first adjusting rod 19, the threaded rod 21 is rotatably connected to the mounting rod 18 through a bearing, the threaded tube 22 is rotatably connected to the first adjusting rod 19 through a bearing, the position of the fixing seat 25 is pushed by the second adjusting rod 20 and the first adjusting rod 19, and then the roller brush 26 is driven to clean the iron filings attached to the surface of the fixing plate 2.

[0034] The threaded rod 21 passes through the first adjusting rod 19 and is threadedly connected with the first adjusting rod 19, the threaded tube 22 passes through the second adjusting rod 20 and is threadedly connected with the second adjusting rod 20, two groups of symmetrically distributed limiting grooves 23 are opened on the threaded rod 21, and two groups of symmetrically distributed limiting blocks 24 are arranged in the threaded tube 22, and the limiting blocks 24 are correspondingly arranged with the limiting grooves 23. The threaded tube 22 is slidably connected with the threaded rod 21 through the limiting blocks 24. The first adjusting rod 19 slides under the limiting action of the mounting rod 18 through the rotation of the threaded rod 21, and the threaded rod 21 and the threaded tube 22 rotate synchronously under the action of the limiting blocks 24 and the limiting grooves 23, and the second adjusting rod 20 slides under the limiting action of the first adjusting rod 19.

[0035] The working principle of the clamping fixture suitable for the machine tool workbench is as follows: after the processing of the clamped parts is completed, the cylinder 6 is started to drive the rack 5 to slide, and the gear 4 meshing with the rack 5 drives the mounting shaft 3 to rotate 180 degrees to complete the flipping of the fixed plate 2 and the clamping block 11. The large pieces of iron filings on the fixed plate 2 fall into the mounting seat 1, and the motor in the mounting rod 18 is started to drive the threaded rod 21 to rotate. Under the action of the limit block 24 and the limit groove 23, the first adjustment rod 19 and the second adjustment rod 20 drive the fixed seat 25 to push, and the roller brush 26 brushes the surface of the fixed plate 2. The fixed seat 25 drives the roller brush 26 to advance and the roller brush 26 rotates synchronously to clean the surface of the fixed plate 2, completing the cleaning of the iron filings remaining on the surface of the fixture. At the same time, the cam 31 is driven to rotate under the action of the motor, and the moving block 29 is pushed intermittently. The slider 17 pushes and squeezes the spring 30 at the same time, so that the moving block 2 9 drives the sweeping brush 28 to move back and forth to clean the iron filings attached to the surface of the roller brush 26 to prevent the iron filings adhering to the roller brush 26 from affecting the cleaning effect of the fixture. The function of the two sets of clamping rods 7 is to limit and stabilize the horizontal position of the fixed plate 2 to ensure the stability of the part clamping. Through the slider 17 and the slide groove 16, the first adjusting block 13 can slide on the slider 17 of the clamping block 11, the second adjusting block 14 can slide on the first adjusting block 13, and the third adjusting block 15 can slide on the second adjusting block 14. Under the action of the bidirectional screw 12, the two sets of clamping blocks 11 drive the first adjusting block 13, the second adjusting block 14 and the third adjusting block 15 to gradually contact and squeeze the part during the process of advancing. According to the shape of the special-shaped part, the first adjusting block 13, the second adjusting block 14 and the third adjusting block 15 all make corresponding position changes, so that the clamp fits the shape of the part as much as possible to ensure stable clamping of the special-shaped part.

[0036] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A clamping fixture suitable for a machine tool workbench, comprising a mounting seat (1), characterized in that: A fixing plate (2) is arranged above the mounting seat (1), the fixing plate (2) is rotatably connected to the mounting seat (1) via a mounting shaft (3), a gear (4) is sleeved on the mounting shaft (3), a rack (5) is arranged inside the mounting seat (1), the rack (5) is meshedly connected to the gear (4), the rack (5) is slidably connected to the mounting seat (1), a cylinder (6) is arranged inside the mounting seat (1), the rack (5) is connected to the output end of the piston rod of the cylinder (6), two groups of symmetrically distributed clamping rods (7) are arranged inside the mounting seat (1), two groups of symmetrically distributed bidirectional screw rods (8) are arranged inside the mounting seat (1), a fixing seat (25) is arranged inside the fixing seat (1), a roller brush (26) is arranged on the fixing seat (25), the roller brush (26) is arranged corresponding to the fixing plate (2), a sweeping brush (28) is arranged on the fixing seat (25), and the sweeping brush (28) is fitted with the roller brush (26).

2. The clamp-on fixture suitable for a machine tool workbench according to claim 1, characterized in that: The fixing plate (2) is provided with two groups of symmetrically distributed clamping blocks (11), the fixing plate (2) is provided with a bidirectional screw (12), the two ends of the bidirectional screw (12) respectively penetrate the two groups of clamping blocks (11) and are threadedly connected to the clamping blocks (11), the two ends of the bidirectional screw (12) respectively penetrate the fixing plate (2) and are rotatably connected to the fixing plate (2), the clamping block (11) is provided with a first adjustment block (13), the first adjustment block (13) is provided with two groups of symmetrically distributed second adjustment blocks (14), the two groups of the second adjustment blocks (14) are provided with two groups of symmetrically distributed third adjustment blocks (15), the clamping block (11), the first adjustment block (13) and the second adjustment block (14) are provided with sliding grooves (16), and the first adjustment block (13), the second adjustment block (14) and the third adjustment block (15) are each provided with a slider (17) behind them.

3. The clamp-on fixture suitable for a machine tool workbench according to claim 1, characterized in that: The two groups of clamping rods (7) are respectively slidably connected to the mounting seat (1), and the two groups of clamping rods (7) are respectively movably clamped with the two sides of the fixing plate (2). The two ends of the bidirectional screw rod (8) respectively penetrate the mounting seat (1) and are rotatably connected with the mounting seat (1). The two ends of the bidirectional screw rod (8) respectively penetrate the two groups of clamping rods (7) and are threadedly connected with the clamping rods (7). The left ends of the two groups of bidirectional screw rods (8) are both sleeved with synchronous wheels (9). A synchronous belt (10) is provided in the mounting seat (1), and the synchronous belt (10) is respectively transmission-connected with the two groups of synchronous wheels (9).

4. The clamp-on fixture for a machine tool workbench according to claim 1, characterized in that: The fixed seat (25) is provided with a fixed rod (27), the sweeping brush (28) is provided with a moving block (29), the moving block (29) is slidably sleeved with the fixed rod (27), the fixed rod (27) is sleeved with a spring (30), the two ends of the spring (30) are respectively fixedly connected with the moving block (29) and the fixed seat (25), the fixed seat (25) is provided with a cam (31), the cam (31) is rotatably connected with the fixed seat (25) through a rotating shaft, and the cam (31) is in contact with the moving block (29).

5. The clamp-on fixture suitable for a machine tool workbench according to claim 1, characterized in that: The mounting seat (1) is provided with a mounting rod (18), a first adjusting rod (19) is provided inside the mounting rod (18), a second adjusting rod (20) is provided inside the first adjusting rod (19), the left end of the second adjusting rod (20) is fixedly connected to the fixing seat (25), a threaded rod (21) is provided inside the mounting rod (18), a threaded tube (22) is provided inside the first adjusting rod (19), the threaded rod (21) is rotatably connected to the mounting rod (18) via a bearing, and the threaded tube (22) is rotatably connected to the first adjusting rod (19) via a bearing.

6. The clamp-on fixture suitable for a machine tool workbench according to claim 5, characterized in that: The threaded rod (21) passes through the first adjusting rod (19) and is threadedly connected to the first adjusting rod (19); the threaded tube (22) passes through the second adjusting rod (20) and is threadedly connected to the second adjusting rod (20); two groups of symmetrically distributed limiting grooves (23) are provided on the threaded rod (21); two groups of symmetrically distributed limiting blocks (24) are provided in the threaded tube (22); the limiting blocks (24) are arranged corresponding to the limiting grooves (23); and the threaded tube (22) is slidably sleeved with the threaded rod (21) via the limiting blocks (24).

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