An adjustable machine tool driven wheel mounting

Abstract

The utility model relates to machine tool technical field especially adjustable machine tool driven wheel mounting seat, including mounting seat subassembly, the bottom of mounting seat subassembly is equipped with the bottom plate, the both sides of the top of bottom plate symmetry and fixedly connected with adjusting cylinder, be equipped with adjusting assembly in adjusting cylinder, the inner chamber rear side of adjusting cylinder is equipped with sliding component, the outside of an adjusting cylinder is equipped with locking assembly, adjusting assembly includes the toothed plate that sets up in the inner chamber of adjusting cylinder, the top fixedly connected with elevating support of toothed plate, elevating support penetrates adjusting cylinder top and with the bottom both sides of mounting seat subassembly fixedly connected, the front side of adjusting cylinder is equipped with drive groove, in the utility model, adopt the synchronous transmission structure that double drive gear is connected with transmission shaft coaxially, rotates adjusting hand wheel can drive both sides drive gear synchronous meshing toothed plate elevating, from mechanical structure on the forced guarantee mounting seat subassembly both sides elevating amount is completely consistent, avoids the height deviation caused by artificial operation precision deficiency.

Description

Technical Field

[0001] This utility model relates to the field of machine tool technology, specifically to an adjustable machine tool driven wheel mounting base. Background Technology

[0002] Machine tools, also known as machining tools, are mechanical equipment used to process workpieces. They use mechanical means such as cutting, grinding, drilling, and tapping to process raw materials or semi-finished products into parts or components with specific shapes, sizes, and surface qualities. Machine tools are an indispensable basic equipment in modern industrial production and are widely used in many fields such as machinery manufacturing, automobiles, aerospace, mold manufacturing, and electronic equipment. The driven wheel mounting base is an important component of the machine tool transmission system. It is mainly used to support and fix the driven wheel to ensure the stability and accuracy of the transmission process. The driven wheel is usually used in conjunction with the driving wheel to transmit power and motion through transmission elements such as belts, chains or gears. The driven wheel needs to be at the same horizontal height as the driving wheel. If the height is off, it will cause uneven tension of the transmission belt / chain. If the height is too low, the transmission belt will easily become loose and slip, resulting in transmission lag. If the height is too high, it will overstretch the transmission components, accelerate wear, and increase the motor load. Therefore, the driven wheel mounting base needs to have height adjustment capability. Traditional driven wheel mounting bases mostly adopt a "single-sided independent adjustment" structure, that is, bolt pushing mechanisms are set on both sides of the mounting base. When adjusting, the operator needs to adjust one side first and then the other side. This method relies on the precision of manual operation and is prone to differences in the lifting amount on both sides due to asynchronous bolt adjustment. This can easily cause the driven wheel and driving wheel to misalign, leading to a decrease in transmission accuracy. Therefore, an adjustable machine tool driven wheel mounting base is proposed to address the above problems. Utility Model Content

[0003] The purpose of this invention is to provide an adjustable machine tool driven wheel mounting base to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: An adjustable machine tool driven wheel mounting base includes a mounting base assembly. A base plate is provided below the mounting base assembly. Adjusting cylinders are symmetrically and fixedly connected to both sides of the top of the base plate. An adjusting component is provided within each adjusting cylinder. A sliding component is provided on the rear side of the inner cavity of each adjusting cylinder. A locking component is provided on the outer side of one of the adjusting cylinders. The adjusting component includes a toothed plate vertically disposed within the inner cavity of the adjusting cylinder. A lifting support is fixedly connected to the top of the toothed plate. The lifting support passes through the top of the adjusting cylinder and is fixedly connected to both sides of the bottom of the mounting base assembly. A drive groove is opened on the front side of the adjusting cylinder. A drive gear is provided on the front side of the drive groove. A transmission shaft is fixedly connected between two drive gears. A drive shaft is fixedly connected to the center of the outer side of one of the drive gears. An adjusting handwheel is fixedly connected to the end of the drive shaft away from the drive gear. The drive gear, transmission shaft, and adjusting handwheel are coaxially arranged.

[0005] As a further optimization of this utility model, the rear sides of both drive gears extend into the adjusting cylinder through drive grooves, and the two drive gears are respectively meshed with adjacent tooth plates.

[0006] As a further optimization of this utility model, the sliding assembly includes a slider fixedly connected to the center of the rear wall of the toothed plate, and the inner rear wall of the adjusting cylinder is provided with a groove corresponding to the position of the slider and matching its specifications. The slider is longitudinally slidably connected to the groove.

[0007] As a further optimization of this utility model, a ball is rotatably embedded at the center of the rear wall of the slider, and a ball groove is formed in the slide groove that corresponds to the position of the ball and matches its specifications, and the ball is rotatably connected in the ball groove.

[0008] As a further optimization of this utility model, the locking assembly includes a locking support plate fixedly connected to the outer wall of an adjusting cylinder, a movable support rod movably passing through the center of the locking support plate, a movable support fixedly connected to the rear end of the movable support rod, and a movable handle fixedly installed on the rear wall of the movable support.

[0009] As a further optimization of this utility model, the front end of the movable support rod is fixedly connected to a locking friction plate, and the locking friction plate and the drive shaft are arranged in an arc shape with corresponding positions and matching specifications.

[0010] As a further optimization of this utility model, a return spring is sleeved on the outer side of the movable support rod, and the front and rear ends of the return spring are fixedly connected to the rear wall of the locking support plate and the front wall of the movable support, respectively.

[0011] Compared with the prior art, the beneficial effects of this utility model are: In this invention, the adjustment component employs a synchronous transmission structure with dual drive gears coaxially connected to the transmission shaft. Rotating the adjustment handwheel drives the drive gears on both sides to synchronously engage and raise / lower the gear plates. This mechanical structure ensures that the lifting and lowering amounts on both sides of the mounting base assembly are completely consistent, avoiding height deviations caused by insufficient precision in manual operation. It ensures that the driven wheel always maintains the same horizontal height as the driving wheel. The locking component, through a return spring and an arc-shaped friction plate, achieves convenient and stable locking, preventing height deviations caused by external factors. The overall solution eliminates the need for repeated manual leveling, significantly reducing operational difficulty, substantially improving the transmission accuracy and stability of the driven wheel installation, reducing equipment wear and maintenance costs, and ensuring machine tool processing accuracy and operating efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the base plate of this utility model; Figure 3 This is a cross-sectional view of the adjusting cylinder of this utility model; Figure 4 This is a rear sectional view of the adjusting cylinder of this utility model; Figure 5 This utility model Figure 4 Enlarged view of point A; Figure 6 This is a structural schematic diagram of the locking component of this utility model; Figure 7 This is a schematic diagram of the rear structure at the locking component of this utility model; Figure 8 This is a schematic diagram of the locking component of this utility model.

[0013] In the diagram: 1. Mounting base assembly; 2. Base plate; 3. Adjusting cylinder; 4. Adjusting assembly; 41. Gear plate; 42. Lifting support; 43. Drive groove; 44. Drive gear; 45. Transmission shaft; 46. Drive shaft; 47. Adjusting handwheel; 5. Sliding assembly; 51. Slider; 52. Slide groove; 53. Ball bearing; 54. Ball bearing groove; 6. Locking assembly; 61. Locking support plate; 62. Movable support rod; 63. Movable support; 64. Movable handle; 65. Locking friction plate; 66. Return spring. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0016] Please see Figures 1-8 This utility model provides a technical solution: An adjustable machine tool driven wheel mounting base includes a mounting base assembly 1. A base plate 2 is provided below the mounting base assembly 1. Adjusting cylinders 3 are symmetrically and fixedly connected to the top two sides of the base plate 2. An adjusting component 4 is provided in the adjusting cylinder 3. A sliding component 5 is provided on the rear side of the inner cavity of the adjusting cylinder 3. A locking component 6 is provided on the outer side of one adjusting cylinder 3. The adjusting component 4 includes a toothed plate 41 vertically arranged in the inner cavity of the adjusting cylinder 3. A lifting support 42 is fixedly connected to the top of the toothed plate 41. The lifting support 42 passes through the top of the adjusting cylinder 3 and is fixedly connected to the bottom two sides of the mounting base assembly 1. A drive groove 43 is opened on the front side of the adjusting cylinder 3. A drive gear 44 is provided on the front side of the drive groove 43. A transmission shaft 45 is fixedly connected between two drive gears 44. A drive shaft 46 is fixedly connected at the center of the outer side of one drive gear 44. An adjusting handwheel 47 is fixedly connected to the end of the drive shaft 46 away from the drive gear 44. The drive gear 44, transmission shaft 45, drive shaft 46 and adjusting handwheel 47 are coaxially arranged. As a further implementation of this scheme, the rear sides of both drive gears 44 extend into the adjusting cylinder 3 through the drive groove 43, and the two drive gears 44 are respectively meshed with the adjacent tooth plates 41. It is worth noting that: the base plate 2, as the overall installation reference, is made of high-strength steel plate and cut into shape. Multiple mounting holes are pre-set at the four corners, which can be rigidly connected to the machine tool frame by bolts to ensure the overall stability of the mounting base. The adjusting cylinders 3, which are symmetrically fixed on both sides of the top of the base plate 2, are hollow rectangular structures and are made of aluminum alloy in one piece, combining lightweight and rigidity. Their inner cavity size is adapted to the toothed plate 41 of the adjusting component 4, providing vertical guide space for the lifting and lowering of the toothed plate 41. Furthermore: the adjusting component 4 is the core drive unit for height adjustment. The vertically arranged toothed plate 41 is made of 45 steel with heat treatment (hardness HRC28-32), and the tooth surface is enhanced by high-frequency quenching to improve wear resistance. The top is welded and fixed to the lifting support 42. The lifting support 42 passes through the top of the adjusting cylinder 3 and is fixedly connected to the bottom sides of the mounting base assembly 1, forming a force transmission chain of "toothed plate 41-lifting support 42-mounting base assembly 1", ensuring that the adjusting force can be stably transmitted to the driven wheel installation position. The drive groove 43 on the front side of the adjusting cylinder 3 is a long rectangular opening, with a width of... The thickness is slightly greater than that of the drive gear 44, ensuring that the rear end of the drive gear 44 can extend into the adjusting cylinder 3 and mesh with the toothed plate 41. The two drive gears 44 are coaxially fixed through the transmission shaft 45 to achieve synchronous rotation, ensuring that the lifting height of the toothed plates 41 on both sides is consistent and preventing the mounting base assembly 1 from tilting. The drive shaft 46 is coaxially fixed with the outer drive gear 44. The adjusting handwheel 47 at the end is wrapped with anti-slip rubber, which makes it easy for the operator to rotate the adjusting handwheel 47 to drive the drive gear 44 to rotate, thereby driving the toothed plate 41 to rise and fall, so as to achieve fine adjustment of the installation height of the driven wheel. As a further implementation of this solution, the sliding assembly 5 includes a slider 51 fixedly connected to the center of the rear wall of the toothed plate 41. The rear wall of the inner cavity of the adjusting cylinder 3 is provided with a groove 52 that corresponds to the position of the slider 51 and matches its specifications. The slider 51 is longitudinally slidably connected in the groove 52. A ball bearing 53 is rolledly embedded at the center of the rear wall of the slider 51. A ball groove 54 that corresponds to the position of the ball bearing 53 and matches its specifications is provided in the groove 52. The ball bearing 53 is rolledly connected in the ball groove 54. It should be noted that: the sliding assembly 5 is used to ensure the straightness and stability of the toothed plate 41 during lifting and lowering, and to prevent the toothed plate 41 from deviating and causing adjustment jamming. The slider 51 at the center of the rear wall of the toothed plate 41 has a T-shaped structure, which forms a sliding fit with the groove 52 (T-shaped groove) on the rear wall of the inner cavity of the adjusting cylinder 3, limiting the horizontal deviation of the toothed plate 41. The ball 53 embedded in the center of the rear wall of the slider 51 is made of high-hardness bearing steel, and its diameter is adapted to the ball groove 54. It can roll along the longitudinal direction of the ball groove 54, converting the sliding friction between the slider 51 and the groove 52 into rolling friction, which greatly reduces the lifting resistance (the friction coefficient is reduced to below 0.02), making the adjustment operation more labor-saving, while reducing the wear of the slider 51 and the groove 52 and extending the service life. The ball groove 54 is an arc-shaped groove that matches the ball 53. The depth is 1 / 2 of the diameter of the ball 53, which not only ensures that the ball 53 can roll stably, but also prevents the ball 53 from falling off, further improving the reliability of the sliding assembly 5. As a further implementation of this solution, the locking assembly 6 includes a locking support plate 61 fixedly connected to the outer wall of an adjusting cylinder 3. A movable support rod 62 is movably passed through the center of the locking support plate 61. A movable support 63 is fixedly connected to the rear end of the movable support rod 62. A movable handle 64 is fixedly installed on the rear wall of the movable support 63. A locking friction plate 65 is fixedly connected to the front end of the movable support rod 62. The locking friction plate 65 and the drive shaft 46 are arranged in an arc shape with corresponding positions and matching specifications. A return spring 66 is sleeved on the outer side of the movable support rod 62. The front and rear ends of the return spring 66 are fixedly connected to the rear wall of the locking support plate 61 and the front wall of the movable support 63, respectively. It should be noted that: the locking component 6 is used to fix the drive shaft 46 after adjustment, preventing the adjusting handwheel 47 from rotating due to external factors or the toothed plate 41 from sliding down due to external force or vibration. The locking support plate 61 is welded and fixed to the outer wall of the adjusting cylinder 3 on one side, providing stable support for the locking component 6; the movable support rod 62 is a cylindrical optical shaft, which is clearance-fitted with the through hole in the center of the locking support plate 61 and can slide back and forth; the locking friction plate 65 at the front end has an arc-shaped structure, with the inner arc surface fitting against the outer circle of the drive shaft 46, and a high-friction coefficient rubber pad (friction coefficient ≥ 0.8) is pasted on the surface, which limits the rotation of the shaft through the friction with the drive shaft 46. The return spring 66 on the outer side of the movable support rod 62 is a compression spring. In its natural state, it pushes the movable support 63 forward through its elastic force, causing the locking friction plate 65 to press tightly against the drive shaft 46, thus achieving automatic locking. The movable handle 64 on the rear wall of the movable support 63 has a U-shaped structure. When the operator pulls the movable handle 64 backward, the movable support rod 62 and the locking friction plate 65 can move backward, releasing the lock on the drive shaft 46, which is convenient for height adjustment. After adjustment, the movable handle 64 is released, and the return spring 66 can automatically drive the locking friction plate 65 to reset and lock. The operation is convenient and efficient, and no additional tools are required.

[0017] Work process: Before installation, the mounting base assembly 1 is in the initial low position. The driven wheel is pre-fixed to the installation position (not marked) on the top of the mounting base assembly 1 by bolts. At this time, the locking assembly 6 is in the automatic locking state: the return spring 66 extends naturally and pushes the movable support 63 forward through the elastic force, which drives the movable support rod 62 to move forward along the through hole of the locking support plate 61, so that the locking friction plate 65 (inner arc surface rubber pad) at the front end is tightly attached to the outside of the drive shaft 46. The friction force restricts the rotation of the drive shaft 46, and then fixes the position of the tooth plate 41 and the lifting support 42 through the meshing relationship between the drive gear 44 and the tooth plate 41, preventing the mounting base assembly 1 from sliding down unexpectedly. When the height of the driven wheel needs to be adjusted, the operator holds the movable handle 64 of the locking component 6 and pulls the movable support 63 backward. The movable support 63 stretches the return spring 66, and at the same time drives the movable support rod 62 and the locking friction plate 65 to move backward in sync, so that the locking friction plate 65 is separated from the drive shaft 46, releasing the rotation restriction on the drive shaft 46. At this time, the drive shaft 46 can rotate freely and enter the height adjustment state. Next, the operator holds the adjusting handwheel 47 and rotates the handwheel according to the required height direction of the driven wheel (raising or lowering): the adjusting handwheel 47 drives the drive shaft 46 to rotate coaxially, the drive shaft 46 drives the adjacent drive gear 44 to rotate, since the two drive gears 44 are fixedly connected by the transmission shaft 45, the other drive gear 44 rotates synchronously with this drive gear 44, realizing the synchronous transmission of "adjusting handwheel 47-drive shaft 46-double drive gear 44-transmission shaft 45"; The rear sides of the two drive gears 44 extend into the inner cavity through the drive groove 43 of the adjusting cylinder 3 and mesh with the tooth plate 41. When the drive gears 44 rotate, they push the tooth plate 41 to move longitudinally along the inner cavity of the adjusting cylinder 3 through tooth surface meshing. The lifting support 42 at the top of the tooth plate 41 drives the mounting base assembly 1 to move longitudinally in sync, thereby adjusting the height of the driven wheel. During the entire adjustment process, the dual drive gears 44 rotate synchronously to ensure that the lifting speed and height of the tooth plates 41 on both sides are completely consistent, avoiding tilting of the mounting base assembly 1 and ensuring the horizontal accuracy of the driven wheel installation. During the lifting and lowering of the toothed plate 41 along the adjusting cylinder 3, the sliding assembly 5 provides stable guidance throughout the process: the slider 51 on the rear wall of the toothed plate 41 is embedded in the groove 52 on the rear wall of the inner cavity of the adjusting cylinder 3, and slides longitudinally along the groove 52 synchronously with the toothed plate 41. The T-shaped structure of the groove 52 restricts the horizontal displacement of the slider 51, ensuring that the toothed plate 41 always moves in the vertical direction, and avoiding the drive gear 44 from meshing and jamming with the toothed plate 41 due to the displacement of the toothed plate 41. At the same time, the balls 53 on the rear wall of the slider 51 move along the groove 52. The ball 53 converts the sliding friction between the slider 51 and the groove 52 into rolling friction, which greatly reduces the lifting resistance (the operating force can be reduced to less than 30N), making the adjustment process easier. At the same time, it reduces the wear of the slider 51 and the groove 52 (extending the service life by 2-3 times). The arc-shaped structure of the ball groove 54 limits the ball 53, preventing the ball 53 from falling off during rolling, ensuring the stable operation of the sliding component 5, and further ensuring the smoothness and straightness of the lifting of the toothed plate 41. During the process of the toothed plate 41 moving up and down along the adjusting cylinder 3, the sliding component 5 provides stable guidance throughout the process: the slider 51 on the rear wall of the toothed plate 41 is embedded in the groove 52 on the rear wall of the inner cavity of the adjusting cylinder 3, and slides longitudinally along the groove 52 synchronously with the toothed plate 41. The T-shaped structure of the groove 52 restricts the horizontal displacement of the slider 51, ensuring that the toothed plate 41 always moves in the vertical direction, and avoiding the gear from meshing and jamming with the toothed plate 41 due to the displacement of the toothed plate 41. Meanwhile, the balls 53 on the rear wall of the slider 51 roll along the ball groove 54 of the slide 52: the balls 53 convert the sliding friction between the slider 51 and the slide 52 into rolling friction, which greatly reduces the lifting resistance (the operating force can be reduced to less than 30N), making the adjustment process easier, and at the same time reducing the wear of the slider 51 and the slide 52 (extending the service life by 2-3 times). The arc-shaped structure of the ball groove 54 limits the balls 53, preventing the balls 53 from falling off during the rolling process, ensuring the stable operation of the sliding component 5, and further ensuring the smoothness and straightness of the lifting of the toothed plate 41. Once the driven wheel height is adjusted to the target position, the operator stops rotating the adjusting handwheel 47 and slowly releases the movable handle 64. After the return spring 66 loses its external tension, it pushes the movable support 63 forward through its own rebound force. The movable support 63 then moves the movable support rod 62 and the locking friction plate 65 forward until the locking friction plate 65 is once again firmly against the outside of the drive shaft 46. The friction between the rubber pad and the drive shaft 46 re-locks the drive shaft 46, restricting its rotation. At this time, the drive gear 44 cannot rotate. The position of the toothed plate 41 is fixed by the meshing relationship. The lifting support 42 and the mounting base assembly 1 are kept at the target height. The driven wheel height positioning is completed. After locking, even if the mounting base assembly 1 bears the lateral or longitudinal force transmitted by the driven wheel, the continuous elastic force of the return spring 66 can ensure the tight fit between the locking friction plate 65 and the drive shaft 46, avoid the drive shaft 46 from loosening due to vibration or external force, ensure the long-term stability of the driven wheel height, and meet the requirements of the driven wheel position accuracy during machine tool processing. The overall structure ensures the mounting base is level through synchronous adjustment, the sliding component 5 ensures stable lifting, and the locking component 6 enables convenient fixing. The three components work together to meet the requirements of precision, stability and ease of operation for adjusting the installation height of the machine tool driven wheel, and adapt to the installation and maintenance needs of the driven wheel under different working conditions.

[0018] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable machine tool driven wheel mounting base, comprising a mounting base assembly (1), characterized in that: The mounting base assembly (1) is provided with a base plate (2) below it. The top two sides of the base plate (2) are symmetrically and fixedly connected with adjusting cylinders (3). The adjusting cylinders (3) are provided with adjusting components (4). The rear side of the inner cavity of the adjusting cylinders (3) is provided with sliding components (5). The outer side of one of the adjusting cylinders (3) is provided with locking components (6). The adjustment assembly (4) includes a toothed plate (41) vertically arranged in the inner cavity of the adjustment cylinder (3). A lifting support (42) is fixedly connected to the top of the toothed plate (41). The lifting support (42) passes through the top of the adjustment cylinder (3) and is fixedly connected to the bottom sides of the mounting base assembly (1). A drive groove (43) is opened on the front side of the adjustment cylinder (3). A drive gear (44) is provided on the front side of the drive groove (43). A transmission shaft (45) is fixedly connected between the two drive gears (44). A drive shaft (46) is fixedly connected at the outer center of one of the drive gears (44). An adjustment handwheel (47) is fixedly connected to the end of the drive shaft (46) away from the drive gear (44). The drive gear (44), transmission shaft (45), drive shaft (46) and adjustment handwheel (47) are coaxially arranged.

2. The adjustable machine tool driven wheel mounting base according to claim 1, characterized in that: The rear sides of both drive gears (44) extend into the adjusting cylinder (3) through drive grooves (43), and the two drive gears (44) are respectively meshed with adjacent tooth plates (41).

3. An adjustable machine tool driven wheel mounting base according to claim 1, characterized in that: The sliding assembly (5) includes a slider (51) fixedly connected to the center of the rear wall of the toothed plate (41). The inner rear wall of the adjusting cylinder (3) is provided with a groove (52) that corresponds to the position of the slider (51) and matches its specifications. The slider (51) is longitudinally slidably connected in the groove (52).

4. An adjustable machine tool driven wheel mounting base according to claim 3, characterized in that: A ball (53) is rolled and embedded in the center of the rear wall of the slider (51). A ball groove (54) is opened in the groove (52) that corresponds to the position of the ball (53) and matches its specifications. The ball (53) is rolled and connected in the ball groove (54).

5. An adjustable machine tool driven wheel mounting base according to claim 1, characterized in that: The locking assembly (6) includes a locking support plate (61) fixedly connected to the outer wall of an adjusting cylinder (3). A movable support rod (62) is movably passed through the center of the locking support plate (61). A movable support (63) is fixedly connected to the rear end of the movable support rod (62). A movable handle (64) is fixedly installed on the rear wall of the movable support (63).

6. An adjustable machine tool driven wheel mounting base according to claim 5, characterized in that: The front end of the movable support rod (62) is fixedly connected to a locking friction plate (65), and the locking friction plate (65) and the drive shaft (46) are arranged in an arc shape with corresponding positions and matching specifications.

7. An adjustable machine tool driven wheel mounting base according to claim 5, characterized in that: A return spring (66) is sleeved on the outer side of the movable support rod (62). The front and rear ends of the return spring (66) are fixedly connected to the rear wall of the locking support plate (61) and the front wall of the movable support (63), respectively.

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