Clamp for bearing production

Abstract

The utility model provides a clamp for bearing production, which belongs to the technical field of bearing processing equipment and comprises an opening formed in the middle of a workbench, a cylinder arranged at the lower part of the opening, a fixed bracket arranged at the bottom of the cylinder, a movable base arranged at the movable end of the cylinder, a clamping component arranged on the movable base, and a slideway arranged in the middle of the rear part of the workbench, a supporting plate is arranged on the side, away from the opening, of the sliding way, an electric push rod is arranged on the face, close to the opening, of the supporting plate, a linkage block is arranged at the telescopic end of the electric push rod, a connecting column is arranged on the side, close to the opening, of the linkage block, and a positioning assembly is arranged on the surface of the connecting column. The positioning assembly is driven by the electric push rod to move to the position of the inner ring of the bearing, the positioning block is driven by the electric lifting rod to stabilize the inner ring of the bearing, then the bearing is kept stable during machining, and therefore the machining quality of the bearing is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing processing equipment technical field, concretely relates to a clamp for bearing production. BACKGROUND

[0002] The bearing is an important spare part in contemporary mechanical equipment, and its main function is to support the mechanical rotary body, reduce the friction coefficient in the movement process, and ensure the rotation precision. Among them, in the production process of the bearing, in some small and medium-sized enterprises, in order to save cost, personnel can choose to use the assembly mechanism to assist personnel for the production operation of the bearing.

[0003] In the related art, the bearing needs to be processed in the production process, and the processing procedures include turning, grinding, milling, drilling, heat treatment, part assembly and the like. Each procedure needs to accurately position and clamp the bearing workpiece to ensure the machining precision and surface quality.

[0004] In the part assembly process, the existing common bearing clamp structure is relatively simple, most of which can only clamp and fix the outer surface of the bearing, and the clamping angle of the clamp has little inclusivity, so that the angle is difficult to adjust, thereby affecting the stability of the bearing during clamping and causing the bearing to shake. To solve the above problems, a clamp for bearing production is proposed to solve the above problems. UTILITARY MODEL CONTENTS

[0005] Therefore, the utility model provides a clamp for bearing production, the utility model discloses through the cylinder and moves the movable base, and then makes the clamping assembly clamps the outer ring of bearing, through the electric push rod and moves the positioning assembly to the inner ring of bearing, through the electric lifting rod and makes the positioning block firm the inner ring of bearing, and then when bearing is kept stable during processing, thereby improve the processing quality of bearing.

[0006] To solve the above technical problems, the utility model provides a clamp for bearing production, including the support that sets up in the four corners of workbench bottom, the opening is arranged in the middle of workbench, the cylinder is arranged in the lower part of opening, the fixed support is arranged in the bottom of cylinder, the movable end of cylinder is provided with movable base, is provided with clamping assembly on movable base, the slide is centrally arranged in the rear portion of workbench, the support plate is arranged on the side away from opening of slide, the electric push rod is arranged on the side close to opening of support plate, the telescopic end of electric push rod is provided with linkage block, the linkage block is provided with extension rod on the side close to opening, the connection block is provided with connecting column on the side close to opening of extension rod, the surface of connecting column is provided with one positioning assembly for supporting the inner ring of bearing.

[0007] The clamping assembly comprises movable rods symmetrically installed in the movable base, the movable base is in the shape of an inverted convex character, the movable rods are used to drive the movable grooved plates and the arc-shaped clamping plates to move, the movable rods are obliquely arranged, the movable rods are in the shape of an inverted eight character, each movable rod is provided with a movable grooved plate on each of the front and rear sides of the end away from the movable base, the movable grooved plates are used to connect the movable rods and the fixed base, the movable grooved plates are obliquely arranged, each pair of movable grooved plates is provided with a fixed base at the bottom, the fixed base is used to connect the movable grooved plates and the working surface of the workbench, each movable rod is provided with an arc-shaped clamping plate on the inner side of the end away from the movable base, the arc-shaped clamping plates are used to clamp and fix the outer ring of the bearing, and the two arc-shaped clamping plates are spliced into a circle.

[0008] Each arc-shaped clamping plate is provided with a buffer pad on the clamping surface, the buffer pad is used to improve the friction force, thereby improving the clamping capacity of the arc-shaped clamping plate on the outer ring of the bearing, the buffer pad is matched with the clamping surface of the arc-shaped clamping plate, and the buffer pad is made of flexible and replaceable material.

[0009] The positioning assembly comprises a plurality of sliding positioning pieces installed on the surface of the connecting column, the plurality of sliding positioning pieces are synchronously moved to assist in positioning the inner ring of the bearing, each sliding positioning piece comprises a connecting plate arranged on the surface of the connecting column, the connecting plate is used to connect the surface of the connecting column and the sliding rail, each connecting plate is provided with a sliding rail on the side away from the connecting column, the sliding rail is used for the movement of the first sliding block, the sliding rail is provided with a first sliding block matched therein, the first sliding block is used to drive the electric lifting rod to move in the sliding rail, each first sliding block is provided with an electric lifting rod on the side away from the connecting column, the electric lifting rod is used to drive the positioning block to move, the telescopic end of the electric lifting rod is provided with a positioning block, the positioning block is used to position the inner ring of the bearing, and the side, close to the connecting block, of the first sliding block is provided with a pneumatic push rod, the pneumatic push rod is used to drive the first sliding block to move in the sliding rail.

[0010] The side, close to the clamping assembly, of the first sliding block is provided with a telescopic rod, the telescopic rod is used to limit the first sliding block, thereby maintaining the position of the first sliding block, the side, away from the first sliding block, of the telescopic rod is provided with a telescopic base, and the telescopic base is used to connect the telescopic rod and the inner wall of the sliding rail.

[0011] The lower part of the linkage block is provided with an auxiliary supporting rod, the auxiliary supporting rod is used to connect the linkage block and the second sliding block, the auxiliary supporting rod is used to reduce the stress borne by the telescopic end of the electric push rod and the lengthened rod, thereby prolonging the service life of the components, the lower end of the auxiliary supporting rod is provided with a second sliding block matched with the sliding groove in sliding manner, the second sliding block is used to connect the auxiliary supporting rod and the sliding groove, so that the auxiliary supporting rod and the linkage block move synchronously, the lengthened rod is provided with a triangular support at the included angle with the auxiliary supporting rod, the triangular support is used to reinforce the connection between the auxiliary supporting rod and the lengthened rod, and further reduces the influence of stress on the lengthened rod and the connecting column.

[0012] In summary, compared with the prior art, the present application has at least one of the following beneficial technical effects:

[0013] 1、Through the movement of the cylinder to drive the movable base, and then the movable rods on the clamping assembly move in the movable base, and then the bearing is placed between the two movable rods, so as to clamp the outer ring of the bearing, and then the lengthened rod and the positioning assembly are driven by the electric push rod to move, and then the positioning assembly moves to the clamped inner ring of the bearing, and then the positioning block is driven by the electric lifting rod to stabilize the inner ring of the bearing, and then the bearing remains stable during machining, thereby improving the machining quality of the bearing.

[0014] 2、The buffer pad is used to improve the friction force, and then improve the clamping capacity of the arc-shaped clamping plate on the bearing outer ring.

[0015] 3、The auxiliary support rod is used to connect the linkage block and the second sliding block, the auxiliary support rod is used to reduce the stress received by the telescopic end of the electric push rod and the lengthened rod, thereby improving the service life of the component, and the triangular support is used to reinforce the connection relationship between the auxiliary support rod and the lengthened rod, and further reduce the influence of the stress received by the lengthened rod and the connecting column. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic view of the main structure of the utility model;

[0017] Figure 2 It is a schematic view of the main structure of the utility model Figure 1 ;

[0018] Figure 3 It is a schematic view of the main structure of the utility model Figure 1 ;

[0019] Figure 4 It is a schematic view of the main structure of the utility model.

[0020] Explanation of reference numerals: 100, workbench; 101, support column; 102, opening; 103, cylinder; 104, fixed support; 200, movable base; 201, clamping assembly; 202, movable rod; 203, movable groove plate; 204, fixed base; 205, arc-shaped clamping plate; 206, buffer pad; 300, slide; 301, support plate; 302, electric push rod; 303, second sliding block; 304, triangular support; 305, linkage block; 306, lengthened rod; 307, connecting block; 308, auxiliary support rod; 400, connecting column; 401, positioning assembly; 402, sliding positioning piece; 403, connecting plate; 404, slide rail; 405, first sliding block; 406, electric lifting rod; 407, positioning block; 500, pneumatic push rod; 501, telescopic rod; 502, telescopic base. DETAILED DESCRIPTION

[0021] For the purpose, technical scheme and advantages of the embodiments of the present application to be clearer, the following will be combined with the drawings of the embodiments of the present application to make a clear and complete description of the technical scheme of the embodiments of the present application. Figures 1-4 It is obvious that the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0022] As Figures 1-4The embodiment provides a clamp for bearing production, which comprises support posts 101 arranged at four corners of the bottom of a workbench 100, an opening 102 arranged at the middle of the workbench 100, the opening 102 being used for the up-down movement of a movable base 200, a cylinder 103 arranged at the lower part of the opening 102, the bottom of the cylinder 103 being fixedly connected with a fixed support 104 through bolts, the movable end of the cylinder 103 being fixedly connected with the movable base 200 through bolts, the bottom of the cylinder 103 being provided with the fixed support 104, the fixed support 104 comprising a flat plate and stand columns arranged at four corners of the flat plate, the stand columns of the fixed support 104 being fixedly connected with the lower surface of the workbench 100 through bolts, the movable end of the cylinder 103 being provided with the movable base 200, the movable base 200 allowing a movable rod 202 to rotate in the movable base 200, the movable base 200 being provided with a clamping assembly 201, the clamping assembly 201 being used for clamping and fixing the surface of a bearing, the rear part of the workbench 100 being centrally provided with a slide 300, the slide 300 being used for moving a second sliding block 303, thereby moving an auxiliary support rod 308, the side, away from the opening 102, of the slide 300 being provided with a support plate 301, the support plate 301 being used for fixedly mounting the driving end of an electric push rod 302, thereby supporting the electric push rod 302, the side, close to the opening 102, of the support plate 301 being provided with the electric push rod 302, the electric push rod 302 being used for pushing a linkage block 305 to move, thereby pushing an extension rod 306 connected with the linkage block 305 and a connecting column 400 to move, thereby moving a positioning assembly 401, the telescopic end of the electric push rod 302 being provided with the linkage block 305, the linkage block 305 being used for connecting the telescopic end of the electric push rod 302 with the extension rod 306, and also being used for connecting the telescopic end of the electric push rod 302 with the extension rod 306 and the auxiliary support rod 308, the side, close to the opening 102, of the linkage block 305 being provided with the extension rod 306, the extension rod 306 being used for lengthening the distance of the connecting column 400, preventing the pushing length of the second sliding block 303 from being insufficient, the side, close to the opening 102, of the extension rod 306 being provided with a connecting block 307, the connecting block 307 being used for connecting the extension rod 306 with the connecting column 400, the end, close to the opening 102, of the connecting block 307 being provided with the connecting column 400, the connecting column 400 being used for mounting the positioning assembly 401, the surface of the connecting column 400 being provided with the positioning assembly 401 used for supporting the inner ring of a bearing, the positioning assembly 401 being used for positioning the inner ring of the bearing to prevent the inner ring from shaking during machining.

[0023] In use, the movable base 200 is driven to move by the air cylinder 103, and then the movable rods 202 on the clamping assembly 201 move in the movable base 200, and then the bearing is placed between the two movable rods 202, so that the outer ring of the bearing is clamped, the lengthened rod 306 and the positioning assembly 401 are driven to move by the electric push rod 302, and then the positioning assembly 401 moves to the clamped inner ring of the bearing, the positioning block 407 is driven to stabilize the inner ring of the bearing by the electric lifting rod 406, and then the bearing remains stable during machining, thereby improving the machining quality of the bearing.

[0024] The embodiment provides a clamp for bearing production,

[0025] As shown in Figure 1 , 2 , 3: the clamping assembly 201 comprises movable rods 202 symmetrically installed in the movable base 200, the movable rods 202 are in the shape of a cuboid, the movable base 200 is in the shape of an inverted convex character, the movable rods 202 are mechanically connected with the movable base 200 through the shafts at the bottom, the movable rods 202 are used to drive the movable groove plates 203 and the arc-shaped clamping plates 205 to move, the movable rods 202 are obliquely arranged, the movable rods 202 are in the shape of an inverted eight-character, the movable rods 202 are provided with movable groove plates 203 on the front and back sides of the end away from the movable base 200, the movable groove plates 203 are in the shape of a rectangle with the ends in the shape of a fan, the movable groove plates 203 are used to connect the movable rods 202 with the fixed bases 204, the upper parts of each pair of movable groove plates 203 clamp the top of the movable rod 202, and the movable groove plates 203 are mechanically connected through the shafts, the movable groove plates 203 are obliquely arranged, the movable groove plates 203 are provided with a fixed base 204 at the bottom, the upper part of the fixed base 204 is in the shape of an arc, the bottom of the fixed base 204 is in the shape of a square, the fixed base 204 is used to connect the movable groove plates 203 with the working surface of the workbench 100, and the lower parts of each pair of movable groove plates 203 are mechanically connected with the fixed base 204 through the shafts, the inside of the end of each movable rod 202 away from the movable base 200 is provided with an arc-shaped clamping plate 205, the arc-shaped clamping plate 205 is fixedly connected with the movable column through bolts or welding, and the arc-shaped clamping plate 205 is used to clamp and fix the outer ring of the bearing.

[0026] Effects: the movable rods 202 are used to drive the movable groove plates 203 and the arc-shaped clamping plates 205 to move, the movable groove plates 203 are used to connect the movable rods 202 with the fixed bases 204, the arc-shaped clamping plates 205 are used to clamp and fix the outer ring of the bearing, and then when the movable base 200 moves downward, the movable rods 202 are in an open state and the bearing can be placed, and the bearing is clamped when the movable base 200 moves downward.

[0027] As shown in Figure 1 , 3As shown in FIGS. 4, the clamping surface of each arc-shaped clamping plate 205 is provided with a buffer pad 206, the buffer pad 206 is adhesively connected with the arc-shaped clamping plate 205, the buffer pad 206 is used to improve the friction, thereby improving the clamping capacity of the arc-shaped clamping plate 205 to the bearing outer ring, the buffer pad 206 is matched with the clamping surface of the arc-shaped clamping plate 205, and the buffer pad 206 is made of flexible and replaceable material.

[0028] The buffer pad 206 is used to improve the friction, thereby improving the clamping capacity of the arc-shaped clamping plate 205 to the bearing outer ring.

[0029] As shown in FIGS. 4, the clamping surface of each arc-shaped clamping plate 205 is provided with a buffer pad 206, the buffer pad 206 is adhesively connected with the arc-shaped clamping plate 205, the buffer pad 206 is used to improve the friction, thereby improving the clamping capacity of the arc-shaped clamping plate 205 to the bearing outer ring, the buffer pad 206 is matched with the clamping surface of the arc-shaped clamping plate 205, and the buffer pad 206 is made of flexible and replaceable material. Figure 1 、 2 As shown in FIGS. 4, the positioning assembly 401 comprises a plurality of sliding positioning pieces 402 mounted on the surface of the connecting column 400, the sliding positioning pieces 402 are preferably three or four, the positions of the sliding positioning pieces 402 are 120° distributed on the surface of the connecting column 400 or 90° distributed, each sliding positioning piece 402 is synchronously moved to assist in positioning the inner ring of the bearing, each sliding positioning piece 402 comprises a connecting plate 403 provided on the surface of the connecting column 400, one side of the connecting plate 403 is arc-shaped and is welded to the connecting column 400, the other side of the connecting plate 403 is horizontally welded to the bottom surface of the sliding rail 404, the connecting plate 403 is used to connect the surface of the connecting column 400 with the sliding rail 404, one side of each connecting plate 403 away from the connecting column 400 is provided with a sliding rail 404, the sliding rail 404 is designed in an I-shaped, a first sliding block 405 is slidably matched with the sliding rail 404, the sliding rail 404 is used for the movement of the first sliding block 405, the first sliding block 405 is adapted to be arranged in the sliding rail 404, the first sliding block 405 is used to drive the electric lifting rod 406 to move in the sliding rail 404, one side of each first sliding block 405 away from the connecting column 400 is provided with the electric lifting rod 406, the driving end of the electric lifting rod 406 is fixedly connected with the first sliding block 405 through bolts, the electric lifting rod 406 is used to drive the positioning block 407 to move, the telescopic end of the electric lifting rod 406 is provided with the positioning block 407, the bottom of the positioning block 407 is provided with a pad fixedly connected with the telescopic end of the electric lifting rod 406 through bolts, the positioning block 407 is used to position the inner ring of the bearing, the positioning block 407 is in a stepped shape, one side of the first sliding block 405 close to the connecting block 307 is provided with a pneumatic push rod 500, the driving end of the pneumatic push rod 500 is fixedly connected with the connecting block 307 through bolts, the telescopic end of the pneumatic push rod 500 is fixedly connected with the first sliding block 405, and the pneumatic push rod 500 is used to drive the first sliding block 405 to move in the sliding rail 404.

[0030] The effect is that the connecting plate 403 is used for connecting the surface of the connecting column 400 with the sliding rail 404, the sliding rail 404 is used for moving the first sliding block 405, the electric lifting rod 406 is used for driving the positioning block 407 to move and position the inner ring of the bearing, and the pneumatic push rod 500 is used for driving the first sliding block 405 to move in the sliding rail 404, so as to drive the positioning assembly 401 to move.

[0031] As shown in Figure 1 , 2 , the first sliding block 405 is provided with a telescopic rod 501 on the side close to the clamping assembly 201, the telescopic rod 501 is internally provided with a spring assembly, one end of the telescopic rod 501 is fixedly connected with the first sliding block 405 through bolts, the telescopic rod 501 is used for limiting the first sliding block 405, so as to keep the position of the first sliding block 405, and the side, away from the first sliding block 405, of the telescopic rod 501 is provided with a telescopic base 502, the other end of the telescopic rod 501 is embeddedly connected or threadedly connected with the telescopic base 502, and the telescopic base 502 is used for connecting the telescopic rod 501 with the inner wall of the sliding rail 404 through bolts.

[0032] The effect is that the telescopic rod 501 is used for limiting the first sliding block 405, so as to keep the position of the first sliding block 405, and then stabilize the positioning assembly 401.

[0033] As shown in Figure 1 , the linkage block 305 is provided with an auxiliary supporting rod 308 at the lower part, the upper end of the auxiliary supporting rod 308 is fixedly connected with the linkage block 305 through bolts, the auxiliary supporting rod 308 is used for connecting the linkage block 305 with the second sliding block 303, the lower end of the auxiliary supporting rod 308 is fixedly connected with the second sliding block 303 through bolts, the auxiliary supporting rod 308 is used for reducing the stress borne by the telescopic end of the electric push rod 302 and the lengthened rod 306, thereby prolonging the service life of the components, the lower end of the auxiliary supporting rod 308 is provided with the second sliding block 303 which is slidingly matched with the slide 300, the second sliding block 303 is used for connecting the auxiliary supporting rod 308 with the slide 300, so that the auxiliary supporting rod 308 moves synchronously with the linkage block 305, the lengthened rod 306 and the auxiliary supporting rod 308 are provided with the triangular support 304 at the included angle, one side of the triangular support 304 is fixedly connected with the auxiliary supporting rod 308 through bolts, the other side of the triangular support 304 is fixedly connected with the lengthened rod 306 through bolts, the triangular support 304 is used for reinforcing the connection between the auxiliary supporting rod 308 and the lengthened rod 306, and further reducing the influence of stress on the lengthened rod 306 and the connecting column 400.

[0034] Its effect is: auxiliary support 308 is used for connecting linkage block 305 with second sliding block 303, auxiliary support 308 is used for reducing the stress that electric push rod 302 telescopic end and lengthening rod 306 receive, and then improve the service life of component, triangular support 304 is used for reinforcing the connection relationship of auxiliary support 308 and lengthening rod 306, further reduce the stress that lengthening rod 306 and connecting column 400 receive.

[0035] Working principle: through the gas cylinder 103 drives movable base 200 to move up and down, and then when movable base 200 moves down, movable rod 202 is in open state and can place bearing, movable base 200 moves down and clamps bearing, so that the outer ring of bearing is clamped, the expansion width of movable rod 202 can be adjusted according to the size of bearing, so that the angle of clamping assembly 201 when clamping bearing is adjusted, through electric push rod 302 drives lengthening rod 306 and positioning assembly 401 to move, and then makes positioning assembly 401 move to the clamped bearing inner ring, through electric lifting rod 406 drives positioning block 407 to stabilize the inner ring of bearing, and then the bearing remains stable when machining, so that the machining quality of bearing is improved.

[0036] In addition, it also needs to be explained that, in the description of the present application, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principle of the present application, a number of improvements and refinements can be made, these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A bearing production clamp, comprising a support column (101) arranged at four corners of the bottom of a workbench (100), and an opening (102) arranged at the middle of the workbench (100), characterized in that: The lower part of the opening (102) is provided with a cylinder (103), the bottom of the cylinder (103) is provided with a fixed support (104), the movable end of the cylinder (103) is provided with a movable base (200), the movable base (200) is provided with a clamping assembly (201), the rear of the workbench (100) is centrally provided with a slide (300), the side of the slide (300) away from the opening (102) is provided with a supporting plate (301), one side of the supporting plate (301) close to the opening (102) is provided with an electric push rod (302), the telescopic end of the electric push rod (302) is provided with a linkage block (305), one side of the linkage block (305) close to the opening (102) is provided with an extension rod (306), one side of the extension rod (306) close to the opening (102) is provided with a connecting block (307), one end of the connecting block (307) close to the opening (102) is provided with a connecting column (400), the surface of the connecting column (400) is provided with a positioning assembly (401) for supporting the inner ring of the bearing.

2. The jig for producing a bearing according to claim 1, characterized in that: The clamping assembly (201) comprises movable rods (202) symmetrically installed in the movable base (200), the movable rods (202) are inclinedly arranged, the movable rods (202) are in the shape of inverted eight characters, the front and back of the end of the movable rods (202) away from the movable base (200) are both provided with movable groove plates (203), the movable groove plates (203) are inclinedly arranged, each pair of movable groove plates (203) is provided with a fixed base (204) at the bottom, the inner side of the end of each movable rod (202) away from the movable base (200) is provided with an arc-shaped clamping plate (205), and two arc-shaped clamping plates (205) are spliced into a circle.

3. The jig for producing a bearing according to claim 2, characterized in that: The clamping surface of each arc-shaped clamping plate (205) is provided with a buffer pad (206), the buffer pad (206) is matched with the clamping surface of the arc-shaped clamping plate (205), and the buffer pad (206) is made of flexible and replaceable material.

4. The jig for producing a bearing according to claim 3, characterized in that: The positioning assembly (401) comprises a plurality of sliding positioning pieces (402) installed on the surface of the connecting column (400), each sliding positioning piece (402) comprises a connecting plate (403) provided on the surface of the connecting column (400), one side of each connecting plate (403) away from the connecting column (400) is provided with a sliding rail (404), a first sliding block (405) is matched and arranged in the sliding rail (404), one side of each first sliding block (405) away from the connecting column (400) is provided with an electric lifting rod (406), the telescopic end of the electric lifting rod (406) is provided with a positioning block (407), and one side of the first sliding block (405) close to the connecting block (307) is provided with a pneumatic push rod (500).

5. The apparatus of claim 4 wherein: the first and second clamping members are each formed of a material having a hardness of at least 60 Rockwell C scale. The first slider (405) is provided with a telescopic rod (501) near one side of the clamping assembly (201), and the telescopic rod (501) is provided with a telescopic base (502) away from one side of the first slider (405).

6. A jig for producing a bearing according to claim 5, wherein: The linkage block (305) is provided with an auxiliary support rod (308) at the lower part, the lower end of the auxiliary support rod (308) is provided with a second slider (303) which is slidingly matched with the slide (300), and the angle between the lengthened rod (306) and the auxiliary support rod (308) is provided with a triangular support (304).

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