Novel jig frame structure

Abstract

The invention relates to the technical field of jig frames, in particular to a novel jig frame structure which is characterized in that two symmetrically-arranged sliding frames are slidably mounted on a base, and supporting rollers and rollers abut against the outer edges of annular stirrups; the positioning frame is fixedly installed at the upper end of the sliding frame and is arranged to be in a U shape, and the thrust spring is in sliding connection with the positioning frame in the direction perpendicular to the thrust spring. The clamping plate is rotationally mounted on the outer side of the middle of the sliding shaft, and a reset torsional spring is arranged between the clamping plate and the sliding shaft; the welding device has the beneficial effects that the thrust spring is arranged in the inner cavity of the positioning frame, the fixed shaft and the sliding shaft are arranged at the two ends of the thrust spring correspondingly, the sliding shaft can slide in the horizontal direction, and when the annular stirrup is rotated, a welded longitudinal steel bar can stir the clamping plate to automatically give way; and each longitudinal steel bar can be welded with the annular stirrup at the lowest end of the annular stirrup, so that the overall welding difficulty of the steel reinforcement cage is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of tire racks, and specifically to a novel tire rack structure. Background Art

[0002] A tire rack is a kind of mold, referring to a scaffolding that mainly plays a load-bearing role, and is a special process equipment for facilitating the assembly and welding of mechanical equipment.

[0003] Chinese Utility Model with the publication number CN218081076U discloses a steel reinforcement cage welding tire rack, which can effectively prevent the longitudinal steel bars from being welded offset from the stirrups and ensure the welding quality of the steel reinforcement cage.

[0004] However, currently, after the tire rack positions the circular stirrups, the rotation of the circular stirrups is restricted. When welding the longitudinal steel bars, they need to be lifted to an appropriate height and kept in a straight state, resulting in an increased welding difficulty for the overall steel reinforcement cage. Therefore, the present invention proposes a novel tire rack structure to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a novel tire rack structure to solve the problem of increased welding difficulty of the longitudinal steel bars after the tire rack positions the circular stirrups as mentioned in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A novel tire rack structure, including a steel reinforcement cage composed of welded circular stirrups and longitudinal steel bars. A base is provided below the steel reinforcement cage. Two symmetrically arranged sliding frames are slidably installed on the base. The sliding frame is in an "L" shape, and a support roller and a roller are respectively rotatably installed at both ends. Both the support roller and the roller abut against the outer edge of the circular stirrup;

[0007] A positioning frame is fixedly installed at the upper end of the sliding frame. The positioning frame is in a "C" shape. A thrust spring is arranged in the inner cavity of the positioning frame. Both ends of the thrust spring are respectively connected to a fixed shaft and a sliding shaft. The thrust spring is slidably connected to the positioning frame along a direction perpendicular to itself;

[0008] A clamping plate is rotatably installed on the outer side of the middle part of the sliding shaft, and a return torsion spring is arranged between the two. A positioning card slot is opened at one end of the clamping plate, and the positioning card slot is stuck on the outside of the circular stirrup.

[0009] Preferably, the other end of the clamping plate is movably sleeved on the outside of the sliding shaft. A guiding notch is opened at the opening of the positioning card slot, and an avoidance groove is opened at the other end of the clamping plate.

[0010] Preferably, sleeves I and II are respectively fixed at both ends of the thrust spring. Sleeve II is located inside the avoidance groove and rotatably sleeved on the outer side of the middle part of the sliding shaft. Sleeve I is rotatably sleeved on the outer side of the fixed shaft, and the fixed shaft is fixedly connected to the positioning frame.

[0011] Preferably, a horizontally arranged sliding groove is penetratingly formed on the side surface of the positioning frame. The fixed shaft is located directly below the middle part of the sliding groove. Anti-rotation sliders are fixedly installed at both ends of the sliding shaft, and the anti-rotation sliders are slidably installed inside the sliding groove and are adapted to it.

[0012] Preferably, a retaining ring is fixedly arranged on one side of the anti-rotation slider. Twisting spring seats are fixedly arranged on both side surfaces of the other end of the clamping plate. Both ends of the return twisting spring are respectively fixedly connected to the retaining ring and the twisting spring seat.

[0013] Preferably, a limiting baffle is fixed on the other side of the anti-rotation slider. The limiting baffle is attached to the outer side wall of the positioning frame. A handle frame is arranged between the two limiting baffles, and the handle frame is in a "C" shape. The handle frame is located outside the positioning frame and is inclined at an angle of 30 degrees to the vertical direction.

[0014] Preferably, two rollers for supporting and limiting the drum are rotatably installed at the upper end of the sliding frame. An annular groove for placing the annular stirrup is formed in the middle of the supporting roller.

[0015] Preferably, adjusting studs horizontally arranged are respectively penetratingly arranged at both ends of the base through threads. One end of the adjusting stud movably penetrates the surface of the sliding frame and extends into the inner cavity of the sliding frame. Annular stoppers are attached to both the inner and outer side walls of the sliding frame, and the annular stoppers are fixedly sleeved on the outer side of the adjusting stud. A handwheel is fixedly installed at the other end of the adjusting stud.

[0016] Preferably, a through groove is penetratingly formed at the bottom of the sliding frame. A limiting plate with a "T" - shaped cross - section is arranged in the inner cavity at the bottom of the sliding frame. The lower end of the limiting plate passes through the through groove and is fixedly connected to the base. The wing flanges on both sides of the limiting plate press on the inner wall of the bottom of the sliding frame.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The present invention provides a thrust spring in the inner cavity of the positioning frame, and a fixed shaft and a sliding shaft are respectively provided at both ends of the thrust spring, the sliding shaft can slide in the horizontal direction, a clamping plate is sleeved on the outer side of the sliding shaft, and a reset torsion spring is provided between the clamping plate and the sliding shaft, and a positioning clamping groove is opened at one end of the clamping plate, and the vertical placement of the annular hoop reinforcement can be ensured by clamping the clamping plate to the outer side of the annular hoop reinforcement. In the process of welding the longitudinal steel bars, when the annular hoop reinforcement is rotated, the welded longitudinal steel bars can push the clamping plate to automatically give way, so that each longitudinal steel bar can be welded with the annular hoop reinforcement at the lowest end of the annular hoop reinforcement, and there is no need to lift the longitudinal steel bars, thereby reducing the overall welding difficulty of the steel cage, and the pushed clamping plate can automatically reset under the action of the reset torsion spring, and continue to be clamped on the outer side of the annular hoop reinforcement to prevent the annular hoop reinforcement from tilting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a front schematic diagram of the overall structure of the present invention;

[0021] Figure 3 It is a three-dimensional schematic diagram of the sliding frame and the base structure of the present invention;

[0022] Figure 4 It is a three-dimensional schematic diagram of the positioning frame structure of the present invention;

[0023] Figure 5 It is a three-dimensional schematic diagram of the card board structure of the present invention;

[0024] Figure 6 It is a three-dimensional schematic diagram of the sliding shaft structure of the present invention;

[0025] Figure 7 It is a schematic cross-sectional view of the positioning frame structure of the present invention.

[0026] In the figure: 1. annular stirrups; 2. longitudinal reinforcement; 3. base; 31. adjusting studs; 4. sliding frame; 41. supporting rollers; 5. rollers; 6. positioning frame; 61. fixed shaft; 62. sliding shaft; 621. retaining ring; 622. anti-rotation slider; 623. limit baffle; 63. thrust spring; 631. sleeve one; 632. sleeve two; 64. sliding groove; 65. handle frame; 7. clamping plate; 71. positioning clamping groove; 72. guide cutout; 73. avoidance groove; 74. torsion spring seat; 8. reset torsion spring. DETAILED DESCRIPTION

[0027] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figures 1 to 7 , the present invention provides a technical solution:

[0029] Embodiment 1, a novel tire frame structure, including a steel cage formed by welding annular stirrups 1 and longitudinal steel bars 2, and a base 3 is arranged below the steel cage, such as Figure 1 As shown, the steel cage is composed of a plurality of equally spaced annular stirrups 1 and a plurality of longitudinal steel bars 2 distributed in an annular array and welded and fixed. When welding the steel cage, firstly, the plurality of annular stirrups 1 are positioned at equal intervals in sequence, and then a longitudinal steel bar 2 is passed through the inner cavity of the plurality of annular stirrups 1 in sequence, and is naturally located at the lowest end of the annular stirrups 1 under the action of gravity, and the longitudinal steel bar 2 is manually spot welded with the plurality of annular stirrups 1, and then the second longitudinal steel bar 2 is inserted, and the plurality of annular stirrups 1 are synchronously rotated 180 degrees, so that the first and second longitudinal steel bars 2 are respectively placed at the highest point and the lowest point of the annular stirrups 1, and then the second longitudinal steel bar 2 is welded and fixed, and then the third and fourth longitudinal steel bars 2 are welded in sequence, so that the four longitudinal steel bars 2 can be distributed in a "cross" shape (circular array distribution). At this time, the steel cage is initially formed and will not easily deform or loosen, and then the remaining longitudinal steel bars 2 are welded according to actual needs. The welding steps and sequence of the remaining longitudinal steel bars 2 do not need to be too rigorous, and it is only necessary to ensure that the longitudinal steel bars 2 on the steel cage after welding are evenly distributed.

[0030] Secondly, two symmetrically arranged sliding frames 4 are slidably mounted on the base 3. The sliding frame 4 is in an "L" shape, and a support roller 41 and a roller 5 are rotatably mounted at both ends. The support roller 41 and the roller 5 are both against the outer edge of the annular stirrup 1. Figure 2 As shown, the two rollers 5 respectively press against the outer edges of the middle area of ​​the annular stirrup 1, and the two supporting rollers 41 respectively press against the outer edges of the bottom area of ​​the annular stirrup 1. Since the relative positions between the rollers 5 and the supporting rollers 41 remain fixed, and the two sliding frames 4 are relatively symmetrical, the two rollers 5 and the two supporting rollers 41 of the device have a total of four points, which can locate the position of the annular stirrup 1 (the line between the rollers 5 and the supporting rollers 41 is used as the chord of the circle where the annular stirrup 1 is located, and the intersection of the mid-perpendicular lines of the two symmetrical chords is the center of the circle), and by adjusting the spacing between the two sliding frames 4, it can adapt to the annular stirrups 1 of different sizes;

[0031] In addition, the positioning frame 6 is fixedly installed at the upper end of the sliding frame 4. The horizontal cross-section of the positioning frame 6 is in a "C" shape. A thrust spring 63 is arranged in the inner cavity of the positioning frame 6. The two ends of the thrust spring 63 are respectively connected with a fixed shaft 61 and a sliding shaft 62. The thrust spring 63 is slidably connected to the positioning frame 6 along the direction perpendicular to itself. It should be noted that it is only necessary that the sliding path of the sliding shaft 62 does not coincide with the position of the fixed shaft 61. Taking this device as an example, a horizontally arranged sliding groove 64 is formed through the side surface of the positioning frame 6. The sliding shaft 62 penetrates through the sliding groove 64 and maintains horizontal sliding along the length direction of the sliding groove 64. At this time, the sliding shaft 62 is located at the right end of the sliding groove 64. The thrust provided by the thrust spring 63 can ensure the stable position of the sliding shaft 62 and prevent it from sliding easily. When the sliding shaft 62 is manually moved so that the sliding shaft 62 crosses the thrust spring 63 and slides to the left end of the sliding groove 64, the thrust spring 63 is first compressed to the shortest and then gradually elongates, but the thrust spring 63 is still in a compressed state. Therefore, when the sliding shaft 62 slides to the left end position of the sliding groove 64, it can also maintain a stable position; Figure 4 and Figure 7 For another example, a horizontally arranged sliding groove 64 is formed through the side surface of the positioning frame 6. The sliding shaft 62 penetrates through the sliding groove 64 and maintains horizontal sliding along the length direction of the sliding groove 64. At this time, the sliding shaft 62 is located at the right end of the sliding groove 64. The thrust provided by the thrust spring 63 can ensure the stable position of the sliding shaft 62 and prevent it from sliding easily. When the sliding shaft 62 is manually moved so that the sliding shaft 62 crosses the thrust spring 63 and slides to the left end of the sliding groove 64, the thrust spring 63 is first compressed to the shortest and then gradually elongates, but the thrust spring 63 is still in a compressed state. Therefore, when the sliding shaft 62 slides to the left end position of the sliding groove 64, it can also maintain a stable position;

[0032] Furthermore, the clamping plate 7 is rotatably installed on the outer side of the middle part of the sliding shaft 62, and a reset torsion spring 8 is arranged between the two. A positioning clamping groove 71 is formed at one end of the clamping plate 7, and the positioning clamping groove 71 is clamped on the outer side of the circular stirrup 1. After the clamping plate 7 is clamped on the outer side of the circular stirrup 1 through the positioning clamping groove 71, it can position the vertical placement of the circular stirrup 1 and prevent the circular stirrup 1 from tilting and toppling. When the circular stirrup 1 rotates, the longitudinal steel bars 2 on the circular stirrup 1 can squeeze the surface of the clamping plate 7 and push the clamping plate 7 to rotate until the longitudinal steel bars 2 cross the clamping plate 7. After that, the clamping plate 7 is reset under the torsional force of the sliding shaft 62 and continues to be clamped on the outer side of the circular stirrup 1. Therefore, on the basis of being able to position the circular stirrup 1, this device will not affect the rotation of the circular stirrup 1 and the longitudinal steel bars 2. During the welding process of the steel reinforcement cage composed of the circular stirrup 1 and the longitudinal steel bars 2, the manual support for the circular stirrup 1 and the longitudinal steel bars 2 is reduced, making the welding process more convenient.

[0033] In order to facilitate the clamping plate 7 to be re-clamped on the outer side of the circular stirrup 1 after rotation and reset, the other end of the clamping plate 7 of this application is movably sleeved on the outer side of the sliding shaft 62. Only relative rotation can occur between the clamping plate 7 and the sliding shaft 62, and they will not separate from each other. A guiding notch 72 is formed at the opening of the positioning clamping groove 71, and an avoidance groove 73 is formed at the other end of the clamping plate 7. The setting of the guiding notch 72 can facilitate the clamping plate 7 to re-clamp and position the circular stirrup 1.

[0034] To avoid the thrust spring 63 from being bent when the sliding shaft 62 slides, the present application also has a sleeve one 631 and a sleeve two 632 fixed to both ends of the thrust spring 63 respectively. The sleeve two 632 is located inside the avoidance groove 73 and is rotatably sleeved on the outer side of the middle part of the sliding shaft 62. The sleeve one 631 is rotatably sleeved on the outer side of the fixed shaft 61. Therefore, both ends of the thrust spring 63 can be rotatably connected to the sliding shaft 62 and the fixed shaft 61 respectively. The fixed shaft 61 is fixedly connected to the positioning frame 6. When the sliding shaft 62 slides, the relative position between the sliding shaft 62 and the fixed shaft 61 changes. However, since the sleeve one 631 and the sleeve two 632 can rotate, the thrust spring 63 itself can remain straight and will not be bent to affect the direction of the elastic force application.

[0035] To prevent the sliding shaft 62 from rotating, the fixed shaft 61 of the present application is located directly below the middle of the sliding groove 64. Anti-rotation sliders 622 are fixedly installed at both ends of the sliding shaft 62. The anti-rotation sliders 622 are slidably installed inside the sliding groove 64 and are adapted to it. As Figure 6 and Figure 4 shown, the anti-rotation sliders 622 are arranged such that the sliding shaft 62 can only slide along the length direction of the sliding groove 64 and cannot rotate. Therefore, when the clamping plate 7 rotates, the return torsion spring 8 can be rotationally compressed, thereby applying a reaction force to the clamping plate 7 to drive the clamping plate 7 to reset.

[0036] To facilitate the removal of the steel reinforcement cage, the present application also has a retaining ring 621 fixedly provided on one side of the anti-rotation slider 622. Torsion spring seats 74 are fixedly provided on both side surfaces of the other end of the clamping plate 7. The two ends of the return torsion spring 8 are fixedly connected to the retaining ring 621 and the torsion spring seats 74 respectively. After the return torsion spring 8 resets the clamping plate 7, the positioning card slot 71 at one end of the clamping plate 7 is stuck outside the circular stirrup 1 for positioning the circular stirrup 1 to prevent the circular stirrup 1 from tilting or toppling. The sliding shaft 62 slides inside the sliding groove 64, which can drive the clamping plate 7 to move accordingly, thereby separating the clamping plate 7 from the circular stirrup 1. After the clamping plate 7 is separated from the circular stirrup 1, the staff can easily remove the steel reinforcement cage.

[0037] To facilitate the staff to drive the sliding shaft 62 to slide, the present application also has a limit baffle 623 fixed to the other side of the anti-rotation slider 622. The limit baffle 623 fits against the outer side wall of the positioning frame 6. The limit baffle 623 is provided to limit the sliding shaft 62 to prevent it from sliding along its own length direction and to prevent the sliding shaft 62 from tilting. A handle frame 65 is provided between the two limit baffles 623, and the handle frame 65 is in a "C" shape. The handle frame 65 is located outside the positioning frame 6 and is inclined at an angle of thirty degrees with respect to the vertical direction. The handle frame 65 is provided to facilitate the staff to pull the sliding shaft 62 to slide. The inclined setting of the handle frame 65 can prevent the clamping plate 7 from being blocked by the handle frame 65 when rotating.

[0038] In order to position the bottom of the annular stirrup 1, the present application also has two rollers rotatably installed on the upper end of the sliding frame 4 to support and limit the drum 5. The setting of the rollers can reduce the friction generated between the drum 5 and the sliding frame 4 when rotating. At the same time, the rollers can also limit the drum 5, so that the drum 5 can be installed on the sliding frame 4 more stably under the action of gravity and will not be easily separated from the sliding frame 4. An annular groove for placing the annular stirrup 1 is opened in the middle of the supporting roller 41. The setting of the annular groove is used to limit the bottom of the annular stirrup 1. After cooperating with the clamping plate 7, it can maximize the stability of the annular stirrup 1 and prevent the annular stirrup 1 from tilting or tipping.

[0039] In order to position the annular stirrups 1 of different sizes, the present application also has horizontally placed adjusting studs 31 through threads at both ends of the base 3, one end of the adjusting stud 31 movably penetrates the surface of the sliding frame 4 and extends to the inner cavity of the sliding frame 4, the inner and outer side walls of the sliding frame 4 are both fitted with annular stoppers, and the annular stoppers are fixedly sleeved on the outer side of the adjusting stud 31, and the other end of the adjusting stud 31 is fixedly installed with a hand wheel, such as Figure 3 As shown, the staff can drive the sliding frame 4 to slide along the length direction of the base 3 by rotating the hand wheel to drive the adjusting stud 31 to rotate. By adjusting the distance between the two sliding frames 4, the device can position the annular stirrups 1 of different diameters.

[0040] In order to limit the sliding of the sliding frame 4, the present application also has a through groove running through the bottom of the sliding frame 4, and a limiting plate with a "T"-shaped cross-section is provided in the bottom inner cavity of the sliding frame 4. The lower end of the limiting plate passes through the through groove and is fixedly connected to the base 3. The side flanges of the limiting plate are pressed on the bottom inner wall of the sliding frame 4. The cooperation of the through groove and the limiting plate enables the sliding frame 4 to slide only along the length direction of the base 3, and the sliding frame 4 and the base 3 will not separate from each other. Figure 2 As shown, since the annular stirrups 1 mainly apply horizontal thrust to the roller 5 and the annular stirrups 1 mainly apply vertical pressure to the supporting roller 41, but since the sliding frame 4 is in an "L" shape, the horizontal thrust torque and vertical pressure torque exerted on the sliding frame 4 itself can offset each other, thereby avoiding the sliding frame 4 from shaking due to unstable position.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel tire frame structure, comprising a steel cage formed by welding annular stirrups (1) and longitudinal steel bars (2), characterized in that: A base (3) is provided below the steel reinforcement cage. Two symmetrically arranged sliding frames (4) are slidably mounted on the base (3). The sliding frame (4) is in an "L" shape, and a support roller (41) and a roller (5) are respectively rotatably mounted at both ends. The support roller (41) and the roller (5) both abut against the outer edge of the circular stirrup (1). A positioning frame (6), the positioning frame (6) is fixedly mounted on the upper end of the sliding frame (4). The positioning frame (6) is arranged in a "C" shape. A thrust spring (63) is arranged in the inner cavity of the positioning frame (6). The two ends of the thrust spring (63) are respectively connected with a fixed shaft (61) and a sliding shaft (62). The thrust spring (63) is slidably connected with the positioning frame (6) along a direction perpendicular to itself. A clamping plate (7), the clamping plate (7) is rotatably mounted on the outer side of the middle part of the sliding shaft (62), and a reset torsion spring (8) is arranged between the two. A positioning card slot (71) is opened at one end of the clamping plate (7), and the positioning card slot (71) is clamped on the outer side of the circular stirrup (1).

2. A novel tire frame structure according to claim 1, characterized in that: The other end of the clamping plate (7) is movably sleeved on the outer side of the sliding shaft (62). A guiding notch (72) is opened at the opening of the positioning card slot (71). An avoidance groove (73) is opened at the other end of the clamping plate (7).

3. A novel tire frame structure according to claim 2, characterized in that: Sleeve one (631) and sleeve two (632) are respectively fixed at the two ends of the thrust spring (63). The sleeve two (632) is located in the inner cavity of the avoidance groove (73) and is rotatably sleeved on the outer side of the middle part of the sliding shaft (62). The sleeve one (631) is rotatably sleeved on the outer side of the fixed shaft (61). The fixed shaft (61) is fixedly connected with the positioning frame (6).

4. A novel tire frame structure according to claim 3, characterized in that: A horizontally arranged sliding groove (64) is penetrated through the side surface of the positioning frame (6). The fixed shaft (61) is located directly below the middle of the sliding groove (64). Anti-rotation sliders (622) are fixedly mounted at both ends of the sliding shaft (62). The anti-rotation sliders (622) are slidably mounted in the inner cavity of the sliding groove (64) and are adapted to it.

5. A novel tire frame structure according to claim 4, characterized in that: A retaining ring (621) is fixedly arranged on one side of the anti-rotation slider (622). Torsion spring seats (74) are fixedly mounted on both side surfaces of the other end of the clamping plate (7). The two ends of the reset torsion spring (8) are respectively fixedly connected with the retaining ring (621) and the torsion spring seat (74).

6. A novel tire frame structure according to claim 5, characterized in that: A limiting baffle (623) is fixed on the other side of the anti-rotation slider (622). The limiting baffle (623) fits against the outer side wall of the positioning frame (6). A handle frame (65) is arranged between the two limiting baffles (623), and the handle frame (65) is in a "C" shape. The handle frame (65) is located on the outer side of the positioning frame (6) and is inclined at an angle of thirty degrees with respect to the vertical direction.

7. A novel tire frame structure according to claim 1, characterized in that: Two rollers for supporting and limiting the roller (5) are rotatably mounted at the upper end of the sliding frame (4). An annular groove for placing the circular stirrup (1) is opened in the middle of the support roller (41).

8. The novel tire frame structure according to claim 1 is characterized in that: Both ends of the base (3) are provided with horizontally placed adjusting studs (31) through threads, one end of the adjusting stud (31) movably penetrates the surface of the sliding frame (4) and extends to the inner cavity of the sliding frame (4), the inner and outer side walls of the sliding frame (4) are both fitted with annular stoppers, and the annular stoppers are fixedly sleeved on the outer side of the adjusting stud (31), and the other end of the adjusting stud (31) is fixedly installed with a hand wheel.

9. The novel tire frame structure according to claim 1 is characterized in that: A through slot is provided through the bottom of the sliding frame (4), and a limit plate with a T-shaped cross section is provided in the inner cavity at the bottom of the sliding frame (4). The lower end of the limit plate passes through the through slot and is fixedly connected to the base (3), and the flanges on both sides of the limit plate are pressed against the inner wall of the bottom of the sliding frame (4).

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