Surfboard compound machine

Abstract

The invention relates to the related technical field of surfboard production, in particular to a surfboard compound machine which comprises a machine body, sliding rods are vertically arranged in sliding openings in a sliding mode, and a rubber barrel is rotationally installed between the ends, close to each other, of the two sliding rods; a triangular first abutting block is fixedly mounted on the surface of the mounting frame, a fixing plate is fixedly mounted at one end of one sliding rod, a trapezoidal second abutting block is fixedly mounted on the surface of the fixing plate through a second spring rod, and a rectangular block is fixedly mounted at the top end of a first sleeving plate; a first abutting rod is fixedly installed on the lower surface of the supporting plate, and a V-shaped opening is formed in the upper surface of the rectangular block. According to the glass fiber laminating device disclosed by the invention, under the cooperation of a first pressing block, a second pressing block, a first spring rod, a second spring rod, a rectangular block and a first pressing rod, a rubber barrel only performs laminating work on glass fibers in one direction, so that the situation that air between the glass fibers and an original board surface cannot be completely extruded out can be avoided, and the laminating effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to surfboard production, and in particular to a surfboard compounding machine. Background Art

[0002] A surfboard is a piece of sports equipment used for surfing. The production process includes material selection and cutting, grinding and polishing, laying glass fiber, adding coating, and curing glue. In order to increase the coefficient of friction between the surfboard and the human body, a waxy outer film is also required on the board surface. When laying glass fiber on the surface of the board material, in order to make the glass fiber with a glue surface on one side fit the original board surface better and squeeze out the air between the glass fiber and the original board surface, a composite machine is required to press the glass fiber so that the glass fiber adheres more closely to the board surface.

[0003] The invention patent with Chinese patent number CN115972740A discloses a surfboard laminating machine, including a placing table, a bracket connected to the placing table, a sliding frame installed on the bracket, a sliding frame installed on the sliding frame, and a roller mechanism provided on the sliding frame, which solves the problem that most existing surfboard laminating machines cannot be fully laminated along the surface of the surfboard, and need to operate the laminating machine to perform reciprocating operation and multiple angle adjustments to laminate the surfboard, resulting in low efficiency.

[0004] The rubber cylinder used for pressing in the above patent document reciprocates in the horizontal direction, thereby performing reciprocating pressing on the glass fiber. When the rubber cylinder is pressed in one direction, the air between the glass fiber and the original board surface can be squeezed out in the same direction as itself. However, since the rubber cylinder is in contact with the glass fiber at all times, when the rubber cylinder moves in the opposite direction to that just moved, some of the air that is not completely squeezed out will remain between the glass fiber and the original board surface as the rubber cylinder is squeezed, affecting the composite effect. Summary of the invention

[0005] The purpose of the present invention is to solve the following shortcomings in the prior art. In the existing surfboard laminating machine, the rubber cylinder used for laminating is to reciprocate in the horizontal direction, so as to perform reciprocating laminating work on the glass fiber. When the rubber cylinder is pressed in one direction, the air between the glass fiber and the original board surface can be squeezed out in the direction consistent with itself. However, since the rubber cylinder is in contact with the glass fiber at all times, when the rubber cylinder moves in the opposite direction to the direction just moved, part of the air that is not completely squeezed out will remain between the glass fiber and the original board surface with the squeezing of the rubber cylinder, affecting the laminating effect, thereby proposing a surfboard laminating machine.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A surfboard compound machine, comprising a machine body, a mounting plate symmetrically and vertically fixedly mounted on the upper surface of the machine body, a reciprocating screw rod being horizontally and rotatably mounted between two of the mounting plates, a U-shaped mounting frame being threadedly sleeved on the reciprocating screw rod, a driving motor being fixedly mounted on the surface of one of the mounting plates, an output shaft of the driving motor being fixedly connected to the reciprocating screw rod, sliding openings being vertically opened on the front and rear surfaces of the mounting frame, a sliding rod being vertically slidably arranged in the sliding opening, a rubber cylinder being rotatably mounted between the ends of the two sliding rods close to each other, a mounting ring being fixedly sleeved on one of the sliding rods, an outer ring wall of the mounting ring being fixedly connected to the inner top wall of the mounting frame through a first spring rod;

[0008] A triangular first pressure block is fixedly installed on the surface of the mounting frame, a fixing plate is fixedly installed on one end of one of the sliding rods, a trapezoidal second pressure block is fixedly installed on the surface of the fixing plate via a second spring rod, the inclined surface of the second pressure block is arranged face to face with the inclined surface of the first pressure block, a first set plate is fixedly sleeved on the second spring rod, a rectangular block is fixedly installed on the top of the first set plate, an L-shaped support plate is fixedly installed on the surface of one of the mounting plates, a first push rod is fixedly installed on the lower surface of the support plate, and a V-shaped opening is opened on the upper surface of the rectangular block for the bottom end of the first push rod to enter.

[0009] As a preferred solution, two pairs of placement plates are vertically symmetrically fixedly installed on the upper surface of the body, a rotating rod is horizontally rotatably installed between one pair of the placement plates, and a load-bearing plate is horizontally fixedly installed between the other pair of the placement plates, a placement plate is fixedly sleeved on the rotating rod, the lower surface of the placement plate is in contact with the upper surface of the load-bearing plate, and a plurality of suction cups are fixedly installed on the upper surface.

[0010] As a preferred solution, limiting rods are symmetrically and horizontally arranged between the two mounting plates, and the mounting frame is slidably sleeved on the two limiting rods.

[0011] As a preferred solution, a gear is fixedly sleeved on the rotating rod, a rack rod meshing with the gear is fixedly mounted on the surface of one of the mounting plates via a third spring rod, a contact rod corresponding to the position of the rack rod is vertically fixedly mounted on the lower surface of the mounting frame, and the rack rod is locked by a locking assembly.

[0012] As a preferred solution, the locking assembly includes a moving rod, a telescopic spring sleeved on the moving rod and two triangular clamping blocks, a mounting groove is horizontally opened on the upper surface of the body, a through hole connected to the mounting groove is opened on the surface of the body, the moving rod is slidably inserted in the through hole, a moving plate is fixedly installed on one end of the moving rod outside the mounting groove, two ends of the telescopic spring are respectively fixedly connected to the body and the moving plate, an L-shaped second set plate is fixedly sleeved on the third spring rod, the two clamping blocks are respectively fixedly installed on the surface of the second set plate located in the mounting groove and one end of the moving rod located in the mounting groove, and the inclined surfaces are arranged face to face, and the moving plate is controlled to move by a pressing component.

[0013] As a preferred embodiment, the pressing component includes a triangular block and a second push rod fixedly mounted on the surface of the movable plate, one of the sliding rods is fixedly sleeved with a fixing ring, and the second push rod is vertically fixedly mounted on the outer ring wall of the fixing ring and corresponds to the position of the triangular block.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. With the cooperation between the first pressing block, the second pressing block, the first spring rod, the second spring rod, the rectangular block and the first pressing rod, when the rubber cylinder moves to one end, it will move upward and be locked. At this time, when the rubber cylinder moves and resets, it will no longer contact the glass fiber. When the rubber cylinder moves and resets, the lock on the rubber cylinder will be released, so that the rubber cylinder will quickly move and reset and contact the glass fiber again. That is, the rubber cylinder will only press the glass fiber in one direction, thereby preventing the air between the glass fiber and the original board surface from being completely squeezed out, thereby improving the composite effect;

[0016] 2. Both ends of the original board surface of the existing surfboard are slightly tilted. When the rubber cylinder moves and resets, the placement plate used to place the original board surface will rotate under the cooperation between the gear, the rack rod, the third spring rod and the locking assembly, so that the end of the original board surface away from the rubber cylinder will be lifted upward, and the end close to the rubber cylinder will sink and be in a horizontal state. In this way, when the rubber cylinder moves down and resets and contacts the glass fiber, the tangent surface of the glass fiber and the rubber cylinder is in a horizontal state, avoiding the generation of component forces in other directions, so that the glass fiber will be wrinkled during the process of the rubber cylinder and the glass fiber being against and moving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front perspective structural diagram of a surfboard compounding machine proposed by the present invention;

[0018] Figure 2 A schematic top view of a three-dimensional structure of a surfboard compounding machine proposed by the present invention;

[0019] Figure 3A schematic diagram of the back three-dimensional structure of a surfboard compounding machine proposed by the present invention;

[0020] Figure 4 A partial three-dimensional top view of the structure of a surfboard compounding machine proposed by the present invention;

[0021] Figure 5 A schematic diagram of the front structure of a surfboard compounding machine proposed by the present invention when a board is placed and tilted

[0022] Figure 6 for Figure 1 The enlarged structural diagram at A in the middle;

[0023] Figure 7 for Figure 2 The enlarged structural diagram at B in the middle;

[0024] Figure 8 for Figure 2 The enlarged structural diagram at C in the middle;

[0025] Fig. 9 for Figure 3 The enlarged structural diagram at D in the middle;

[0026] Fig.10 for Figure 3 Enlarged structural diagram at E in the middle.

[0027] In the figure: 1 body, 2 placement plate, 3 rotating rod, 4 load-bearing plate, 5 placement plate, 6 suction cup, 7 mounting plate, 8 reciprocating screw rod, 9 mounting frame, 10 driving motor, 11 sliding mouth, 12 sliding rod, 13 rubber cylinder, 14 first spring rod, 15 first pressing block, 16 second spring rod, 17 second pressing block, 18 first set plate, 19 rectangular block, 20 support plate, 21 first pressing rod, 22 V-shaped mouth, 23 limiting rod, 24 gear, 25 third spring rod, 26 moving rod, 27 telescopic spring, 28 clamping block, 29 moving plate, 30 second set plate, 31 contact rod, 32 triangular block, 33 second pressing rod, 34 rack rod. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] Reference Figure 1-Figure 10A surfboard compound machine comprises a machine body 1, a mounting plate 7 is symmetrically and vertically fixedly mounted on the upper surface of the machine body 1, a reciprocating screw 8 is horizontally and rotatably mounted between two mounting plates 7, a U-shaped mounting frame 9 is threadedly sleeved on the reciprocating screw 8, a driving motor 10 is fixedly mounted on the surface of one of the mounting plates 7, an output shaft of the driving motor 10 is fixedly connected to the reciprocating screw 8, a sliding opening 11 is vertically opened on the front and rear surfaces of the mounting frame 9, a sliding rod 12 is vertically slidably arranged in the sliding opening 11, a rubber cylinder 13 is rotatably mounted between the ends of the two sliding rods 12 close to each other, a mounting ring is fixedly sleeved on one of the sliding rods 12, and an outer ring wall of the mounting ring is fixedly connected to the inner top wall of the mounting frame 9 through a first spring rod 14;

[0030] A triangular first pressing block 15 is fixedly mounted on the surface of the mounting frame 9, one end of one of the slide bars 12 is fixedly mounted with a fixing plate, a trapezoidal second pressing block 17 is fixedly mounted on the surface of the fixing plate through a second spring bar 16, the inclined surface of the second pressing block 17 is arranged face to face with the inclined surface of the first pressing block 15, a first set plate 18 is fixedly sleeved on the second spring bar 16, a rectangular block 19 is fixedly mounted on the top of the first set plate 18, an L-shaped support plate 20 is fixedly mounted on the surface of one of the mounting plates 7, a first push rod 21 is fixedly mounted on the lower surface of the support plate 20, a V-shaped opening 22 for the bottom end of the first push rod 21 to enter is opened on the upper surface of the rectangular block 19, a limiting rod 23 is symmetrically and horizontally arranged between the two mounting plates 7, and the mounting frame 9 is slidably sleeved on the two limiting rods 23;

[0031] Two pairs of placement plates 2 are vertically and symmetrically fixedly installed on the upper surface of the machine body 1, a rotating rod 3 is horizontally rotatably installed between one pair of placement plates 2, and a bearing plate 4 is horizontally fixedly installed between the other pair of placement plates 2, a placement plate 5 is fixedly sleeved on the rotating rod 3, the lower surface of the placement plate 5 is in contact with the upper surface of the bearing plate 4, and a plurality of suction cups 6 are fixedly installed on the upper surface;

[0032] First, the original board to be pressed is placed on the placement plate 5, and its lower surface is tightly attracted to the multiple suction cups 6. At this time, the reciprocating screw 8 is controlled to rotate by starting the driving motor 10, and the mounting frame 9 threadedly sleeved on the reciprocating screw 8 will move the rubber cylinder 13 in the horizontal direction. During the movement, the rubber cylinder 13 will contact the glass fiber on the upper surface of the original board and press it. In this process, the gas between the glass fiber and the original board will move along with the squeezing of the rubber cylinder 13 and be squeezed out between the glass fiber and the original board.

[0033] Since both ends of the surfboard are slightly tilted upward, when the rubber cylinder 13 moves to the farthest distance, that is, to the end of the surfboard away from the rotating rod 3, the end of the surfboard is blocked by the load-bearing plate 4 and cannot move downward, so the rubber cylinder 13 is pressed upward by the end of the surfboard, the first spring rod 14 is contracted, and the inclined surface of the first pressing block 15 is in sliding contact with the inclined surface of the second pressing block 17. Under the action of the inclined surface pressure, the second spring rod 16 is contracted until the rubber cylinder 13 moves up with the second pressing block 17 to the point where the inclined surface no longer contacts the inclined surface of the first pressing block 15. At this time, the pressing force exerted by the first pressing block 15 on the second pressing block 17 disappears, and the second pressing block 17 is quickly moved and reset under the elastic potential energy of the second spring rod 16, and its lower surface contacts the upper surface of the first pressing block 15. The rubber cylinder 13 is locked, so that when the rubber cylinder 13 is in the process of moving and resetting, the rubber cylinder 13 will not contact the glass fiber until the rubber cylinder 13 is moved and reset. At this time, the bottom end of the first push rod 21 will enter the V-shaped opening 22, and the bottom end surface of the first push rod 21 will abut against the wall of the V-shaped opening 22. Under the effect of the pressing, the rectangular block 19 will shrink with the second spring rod 16, so that the lower surface of the second pressing block 17 will no longer contact the upper surface of the first pressing block 15, thereby releasing the lock of the rubber cylinder 13, and the rubber cylinder 13 will quickly move and reset under the elastic potential energy of the first spring rod 14, and contact the glass fiber again, that is, the rubber cylinder 13 will only press the glass fiber in one direction, thereby preventing the air between the glass fiber and the original board surface from being completely squeezed out, thereby improving the composite effect;

[0034] During the pressing process of the rubber cylinder 13, the glass fiber is pressed by the rubber cylinder 13, and there is a tendency for the rubber cylinder 13 to stretch in the direction of movement. The rubber cylinder 13 only presses the glass fiber in one direction. Compared with the existing rubber cylinder 13 that presses in two opposite directions in a reciprocating manner, the fiber structure inside the glass fiber is avoided from intermittently stretching and deforming in different directions, which can effectively reduce the degree of stretching of the glass fiber, thereby protecting the glass fiber.

[0035] A gear 24 is fixedly sleeved on the rotating rod 3, a rack rod 34 meshing with the gear 24 is fixedly installed on the surface of one of the mounting plates 7 through a third spring rod 25, a contact rod 31 corresponding to the position of the rack rod 34 is vertically fixedly installed on the lower surface of the mounting frame 9, and the rack rod 34 is locked by a locking assembly, which includes a moving rod 26, a telescopic spring 27 sleeved on the moving rod 26, and two triangular clamping blocks 28, a mounting groove is horizontally opened on the upper surface of the body 1, and a through opening connected to the mounting groove is opened on the surface of the body 1, the moving rod 26 is slidably inserted in the through opening, and a moving rod 26 is fixedly installed at one end outside the mounting groove The plate 29, the two ends of the telescopic spring 27 are fixedly connected to the body 1 and the moving plate 29 respectively, the third spring rod 25 is fixedly sleeved with an L-shaped second set plate 30, and the two clamping blocks 28 are respectively fixedly installed on the surface of the second set plate 30 located in the installation groove and one end of the moving rod 26 located in the installation groove, and the inclined surfaces are arranged face to face. The moving plate 29 is controlled to move by a pressing component, and the pressing component includes a triangular block 32 and a second push rod 33 fixedly installed on the surface of the moving plate 29, one of the sliding rods 12 is fixedly sleeved with a fixing ring, and the second push rod 33 is vertically fixedly installed on the outer ring wall of the fixing ring and corresponds to the position of the triangular block 32;

[0036] When the rubber cylinder 13 is in the process of moving and resetting, since the rubber cylinder 13 is located at the upper part, it will not contact the glass fiber, so the second push rod 33 will not contact the triangular block 32, and the contact rod 31 will contact the rack rod 34 and push it to move. In the process of moving, the third spring rod 25 will shrink, and the inclined surfaces of the two clamping blocks 28 will slide and contact. Under the action of the inclined surface, the moving rod 26 will move, and then quickly move and reset under the elastic potential energy of the telescopic spring 27, so as to complete the clamping between the two clamping blocks 28, and enter The position of the rack rod 34 is locked. When the rack rod 34 is moving, the gear 24 meshing with the rack rod 34 will drive the rotating rod 3 and the placing plate 5 to rotate. The end of the original plate surface on the upper surface of the placing plate 5 away from the rubber cylinder 13 will be lifted up, while the end close to the rubber cylinder 13 will sink. In this way, when the rubber cylinder 13 moves down and resets and contacts the glass fiber, the tangent surface of the glass fiber and the rubber cylinder 13 is in a horizontal state, avoiding the generation of component forces in other directions, so that the rubber cylinder 13 and the glass fiber are against each other and move, causing the glass fiber to wrinkle.

[0037] Then, as the rubber cylinder 13 moves, since the rubber cylinder 13 has been moved down and reset, the bottom end surface of the second push rod 33 will slide in contact with the inclined surface of the triangular block 32 during the movement of the rubber cylinder 13. Then, under the action of the inclined surface, the moving plate 29 will move with the moving rod 26 in the direction away from the machine body 1, and the two clamping blocks 28 will separate, thereby releasing the lock on the rack rod 34. The rack rod 34 will quickly move and reset under the elastic potential energy of the third spring rod 25, and then the rotating rod 3 will quickly move and reset with the placement plate 5 and the original plate surface. The lower surface of the placement plate 5 will again be against the upper surface of the load-bearing plate 4 and be in a horizontal state with the upper surface of the machine body 1.

[0038] In the present invention, when the rubber cylinder 13 moves to the farthest distance, that is, is located at the end of the surfboard away from the rotating rod 3, the rubber cylinder 13 will move upward due to the pressure from the end of the surfboard, the first spring rod 14 will shrink, and the inclined surface of the first pressing block 15 will slide in contact with the inclined surface of the second pressing block 17. Under the pressure of the inclined surface, the second spring rod 16 will shrink until the rubber cylinder 13 moves up with the second pressing block 17 to the point where the inclined surface no longer contacts the inclined surface of the first pressing block 15. At this time, the pressing force exerted by the first pressing block 15 on the second pressing block 17 disappears, and the second pressing block 17 will quickly move and reset under the elastic potential energy of the second spring rod 16, and its lower surface will contact with the upper surface of the first pressing block 15, thereby completing the locking of the rubber cylinder 13. In this way, when the rubber cylinder 13 is in the process of moving and resetting, the rubber cylinder 13 The cylinder 13 will not contact the glass fiber until the rubber cylinder 13 moves and resets. At this time, the bottom end of the first push rod 21 will enter the V-shaped groove 22, and the bottom end surface of the first push rod 21 will abut against the wall of the V-shaped groove 22. Under the pressure of the wall of the V-shaped groove 22, the rectangular block 19 will shrink with the second spring rod 16, so that the lower surface of the second pressing block 17 is no longer in contact with the upper surface of the first pressing block 15, thereby releasing the lock of the rubber cylinder 13. The rubber cylinder 13 will quickly move and reset under the elastic potential energy of the first spring rod 14, and contact the glass fiber again, that is, the rubber cylinder 13 will only press the glass fiber in one direction, thereby avoiding the air between the glass fiber and the original board surface from being completely squeezed out by the reciprocating squeezing of the rubber cylinder 13 in the horizontal direction, thereby improving the composite effect.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A surfboard compounding machine, comprising a machine body (1), characterized in that: The upper surface of the machine body (1) is symmetrically and vertically fixedly installed with a mounting plate (7), a reciprocating screw (8) is horizontally and rotatably installed between the two mounting plates (7), a U-shaped mounting frame (9) is threadedly sleeved on the reciprocating screw (8), a driving motor (10) is fixedly installed on the surface of one of the mounting plates (7), the output shaft of the driving motor (10) is fixedly connected to the reciprocating screw (8), the front and rear surfaces of the mounting frame (9) are vertically opened with a sliding opening (11), a sliding rod (12) is vertically slidably arranged in the sliding opening (11), a rubber cylinder (13) is rotatably installed between the ends of the two sliding rods (12) that are close to each other, a mounting ring is fixedly sleeved on one of the sliding rods (12), and the outer ring wall of the mounting ring is fixedly connected to the inner top wall of the mounting frame (9) through a first spring rod (14); A triangular first pressure block (15) is fixedly mounted on the surface of the installation frame (9), a fixed plate is fixedly mounted on one end of one of the sliding rods (12), a trapezoidal second pressure block (17) is fixedly mounted on the surface of the fixed plate via a second spring rod (16), the inclined surface of the second pressure block (17) is arranged face to face with the inclined surface of the first pressure block (15), a first sleeve plate (18) is fixedly sleeved on the second spring rod (16), a rectangular block (19) is fixedly mounted on the top of the first sleeve plate (18), an L-shaped support plate (20) is fixedly mounted on the surface of one of the installation plates (7), a first pressure rod (21) is fixedly mounted on the lower surface of the support plate (20), and a V-shaped opening (22) is provided on the upper surface of the rectangular block (19) for the bottom end of the first pressure rod (21) to enter.

2. A surfboard compounding machine according to claim 1, characterized in that: Two pairs of placement plates (2) are vertically symmetrically fixedly installed on the upper surface of the machine body (1), a rotating rod (3) is horizontally rotatably installed between one pair of the placement plates (2), and a load-bearing plate (4) is horizontally fixedly installed between the other pair of the placement plates (2), a placement plate (5) is fixedly sleeved on the rotating rod (3), the lower surface of the placement plate (5) is in contact with the upper surface of the load-bearing plate (4), and a plurality of suction cups (6) are fixedly installed on the upper surface.

3. A surfboard compounding machine according to claim 1, characterized in that: Limiting rods (23) are symmetrically arranged horizontally between the two installation plates (7), and the installation frame (9) is slidably sleeved on the two limiting rods (23).

4. A surfboard compounding machine according to claim 2, characterized in that: A gear (24) is fixedly sleeved on the rotating rod (3); a rack rod (34) meshingly connected to the gear (24) is fixedly mounted on the surface of one of the mounting plates (7) via a third spring rod (25); a contact rod (31) corresponding to the position of the rack rod (34) is vertically fixedly mounted on the lower surface of the mounting frame (9); and the rack rod (34) is locked by a locking assembly.

5. A surfboard compounding machine according to claim 4, characterized in that: The locking assembly comprises a moving rod (26), a telescopic spring (27) sleeved on the moving rod (26) and two triangular clamping blocks (28); a mounting groove is horizontally provided on the upper surface of the machine body (1); a through hole connected to the mounting groove is provided on the surface of the machine body (1); the moving rod (26) is slidably inserted in the through hole; a moving plate (29) is fixedly installed on one end of the moving rod (26) located outside the mounting groove; two ends of the telescopic spring (27) are respectively fixedly connected to the machine body (1) and the moving plate (29); an L-shaped second sleeve plate (30) is fixedly sleeved on the third spring rod (25); the two clamping blocks (28) are respectively fixedly installed on the surface of the second sleeve plate (30) located in the mounting groove and on one end of the moving rod (26) located in the mounting groove, and the inclined surfaces are arranged face to face; the moving plate (29) is controlled to move by a pressing component.

6. A surfboard compounding machine according to claim 5, characterized in that: The pressing component comprises a triangular block (32) fixedly mounted on the surface of the moving plate (29) and a second push rod (33), wherein a fixing ring is fixedly sleeved on one of the sliding rods (12), and the second push rod (33) is vertically fixedly mounted on the outer ring wall of the fixing ring and corresponds to the position of the triangular block (32).

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