CN214732687U - Ear folding self-locking manipulator - Google Patents

Abstract

The utility model relates to a folding lug self-locking mechanical arm for processing double torsional springs, which is used for processing the double torsional springs; the method comprises the following steps: the grabbing mechanism is used for grabbing the middle torsion arm transition part; the pressing mechanism is used for pushing the left torsion arm and the right torsion arm downwards and enabling the right hook head to move downwards from the upper right of the right arm part of the middle torsion arm to the lower right of the right arm part of the middle torsion arm; the lateral pressing mechanism is used for pushing the left torsion arm pushed downwards by the pressing mechanism rightwards and pushing the right torsion arm pushed downwards by the pressing mechanism leftwards. The utility model discloses can realize with the left side gib head back-off of left side torque arm in the middle of on torque arm left side arm to with the right side gib head back-off of right side torque arm in the middle of on torque arm right side arm, borrow this with injecing left side gib head and right side gib head, appear left side gib head and right side gib head and hook on other two torsional springs and lead to warping and be difficult to the phenomenon of separation when avoiding two torsional springs to stack, improve the reliability of product.

Description

Ear folding self-locking manipulator

Technical Field

The utility model relates to a roll over ear auto-lock manipulator for two torsional spring processing.

Background

As shown in fig. 1, the double torsion springs with hook heads are hooked with each other when stacked after being wound, so that the double torsion springs are deformed and difficult to separate, and the quality and subsequent use of the double torsion spring products are affected.

Disclosure of Invention

The utility model aims to provide a folding lug self-locking mechanical arm which is used for processing double torsional springs; the double torsion spring comprises a left torsion arm, a left spiral spring body, a middle torsion arm, a right spiral spring body and a right torsion arm; one end of the left torsion arm is connected to the left side of the left spiral spring body, the other end of the left torsion arm is a free end, and the free end of the left torsion arm is provided with a left hook head bent towards the right side of the left spiral spring body; one end of the right torsion arm is connected with the right side of the right spiral spring body, the other end of the right torsion arm is a free end, and the free end of the right torsion arm is provided with a right hook head bent towards the left side of the right spiral spring body; the middle torque arm is positioned between the right side of the left spiral spring body and the left side of the right spiral spring body and comprises a middle torque arm left arm part, a middle torque arm transition part and a middle torque arm right arm part; one end of the left arm part of the middle torque arm is connected with the right side of the left spiral spring body, and the left torque arm and the left arm part of the middle torque arm both extend to the rear of the left spiral spring body, so that the left torque arm and the left hook head are both positioned above the left arm part of the middle torque arm; one end of the right arm part of the middle torque arm is connected with the left side of the right spiral spring body, and the right torque arm and the right arm part of the middle torque arm both extend towards the rear of the right spiral spring body, so that the right torque arm and the right hook head are both positioned at the upper right part of the right arm part of the middle torque arm; the other end of the left arm part of the middle torque arm and the other end of the right arm part of the middle torque arm are simultaneously connected with the transition part of the middle torque arm;

this book ear auto-lock manipulator includes: the grabbing mechanism is used for grabbing the middle torsion arm transition part; a pressing mechanism for pushing the left torsion arm and the right torsion arm downwards to make the left hook head move downwards from the upper left of the left arm part of the middle torsion arm to the lower left of the left arm part of the middle torsion arm and make the right hook head move downwards from the upper right of the right arm part of the middle torsion arm to the lower right of the right arm part of the middle torsion arm; and the lateral pressing mechanism is used for pushing the left torsion arm pushed downwards by the pressing mechanism rightwards so that the left hook head moves from the left lower part of the left arm part of the middle torsion arm to the right under the left arm part of the middle torsion arm, and pushing the right torsion arm pushed downwards by the pressing mechanism leftwards so that the right hook head moves from the right lower part of the right arm part of the middle torsion arm to the left under the right arm part of the middle torsion arm.

The utility model discloses can realize with the left side gib head back-off of left side torque arm in the middle of on torque arm left side arm to with the right side gib head back-off of right side torque arm in the middle of on torque arm right side arm, borrow this with injecing left side gib head and right side gib head, appear left side gib head and right side gib head and hook on other two torsional springs and lead to warping and be difficult to the phenomenon of separation when avoiding two torsional springs to stack, improve the reliability of product.

Drawings

FIG. 1 illustrates a prior art multiple double torsion spring interlocker;

fig. 2 shows a perspective view of the present invention;

fig. 3 shows an exploded view of the present invention;

FIG. 4 shows a schematic view of the finger cylinder, the hold-down cylinder, the left air cylinder and the right air cylinder separated from each other;

FIG. 5 is a front view of the base of FIG. 2 with the bracket and the finger telescoping cylinder hidden;

FIG. 6 shows a left side view of FIG. 5;

FIG. 7 shows a bottom view of FIG. 5;

FIG. 8 shows an exploded view of the finger cylinder;

fig. 9 to 12 show a schematic view of the double torsion spring grabbing device of the present invention from the double torsion spring forming device, wherein fig. 9 shows a schematic view of the present invention after being installed and adjusted to a position close to the double torsion spring forming device, and the finger cylinder is at a left-hand thread operation position at this time; FIG. 10 is a schematic view of the finger cylinder being driven to extend forward by the finger cylinder; FIG. 11 shows a front view of FIG. 10; FIG. 12 is a schematic view of the finger cylinder grasping the double torsion spring and being actuated by the finger cylinder to retract to the inside out operating position;

FIG. 13 shows a perspective view of the finger cylinder after it has grasped the double torsion spring and returned to the left-hand operating position;

FIG. 14 shows a front view of FIG. 13 with the ball hinge and articulated shaft position shown in partial cross-section;

FIG. 15a is a schematic view of the base of FIG. 13 after the bracket and the finger telescoping cylinder are hidden;

FIG. 15b shows a front view of FIG. 15 a;

FIG. 15c shows a bottom view of FIG. 15 b;

FIG. 16a shows a schematic view of the lower ram being lowered by the lower air cylinder on the basis of FIG. 15 a;

FIG. 16b shows a front view of FIG. 16 a;

FIG. 16c shows a bottom view of FIG. 16 b;

FIG. 17a is the schematic diagram of the situation in which the left air cylinder drives the left pressing block to extend to the right and the right air cylinder drives the right pressing block to extend to the left on the basis of FIG. 16 a;

FIG. 17b shows a front view of FIG. 17 a;

FIG. 17c shows a bottom view of FIG. 17 b;

FIG. 18a shows a schematic view of the lower ram being raised by the upper and lower cylinders on the basis of FIG. 17 a;

FIG. 18b shows a front view of FIG. 18 a;

FIG. 18c shows a bottom view of FIG. 18 b;

FIG. 19 shows a schematic view of the reversed double torsion spring separated from the finger cylinder after completion of the reversing operation;

FIG. 20a shows a perspective view of the double torsion spring before it is reversed;

FIG. 20b shows a front view of FIG. 20 a;

FIG. 20c shows a bottom view of FIG. 20 b;

FIG. 21a shows a perspective view of the left and right torsion arms of the double torsion spring after being pushed down to a predetermined position by the lower push block on the basis of FIG. 20 a;

FIG. 21b shows a front view of FIG. 21 a;

FIG. 21c shows a bottom view of FIG. 21 b;

FIG. 22a is a perspective view of the dual torsion spring after the left torsion arm is pushed to the right to a predetermined position by the left striker and the right torsion arm is pushed to the left to a predetermined position by the right striker on the basis of FIG. 21 a;

FIG. 22b shows a front view of FIG. 22 a;

FIG. 22c shows a bottom view of FIG. 22 b;

FIG. 23a shows a perspective view of the double torsion spring after being reversed;

FIG. 23b shows a front view of FIG. 23 a;

fig. 23c shows a bottom view of fig. 23 b.

Reference numerals:

100 double torsion spring forming equipment

10 double torsion springs, 101 left torsion arms, 102 left spiral spring bodies, 103 right spiral spring bodies, 104 right torsion arms, 105 left hook heads, 106 right hook heads, 107 middle torsion arm left arm parts, 108 middle torsion arm transition parts and 109 middle torsion arm right arm parts;

20 finger cylinders, 201 upper clamping jaws, 202 lower clamping jaws and 203 grooves;

30 finger telescopic cylinders;

40, pressing down a cylinder, 401, pressing down a block and 402 limit stop parts;

50 left air cylinders and 501 left pressing blocks;

60 right pressure cylinders and 601 right pressure blocks;

70 supports, 701 support rods, 702 ball hinges, 703 horizontal brackets and 704 rotating shafts.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

A lug folding self-locking manipulator as shown in fig. 2 to 23c, which is used for processing a double torsion spring;

the double torsion spring 10 includes a left torsion arm 101, a left helical spring body 102, a middle torsion arm, a right helical spring body 103, and a right torsion arm 104;

one end of the left torsion arm 101 is connected to the left side of the left helical spring body 102, the other end of the left torsion arm 101 is a free end, and the free end of the left torsion arm 101 is provided with a left hook head 105 bent towards the right side of the left helical spring body 102;

one end of the right torsion arm 104 is connected with the right side of the right helical spring body 103, the other end of the right torsion arm 104 is a free end, and the free end of the right torsion arm 104 is provided with a right hook head 106 which is bent towards the left side of the right helical spring body 103;

the intermediate torque arm is located between the right side of the left helical spring body 102 and the left side of the right helical spring body 103, and includes an intermediate torque arm left arm portion 107, an intermediate torque arm transition portion 108, and an intermediate torque arm right arm portion 109;

one end of the middle torque arm left arm part 107 is connected with the right side of the left spiral spring body 102, and the left torque arm 101 and the middle torque arm left arm part 107 both extend to the rear of the left spiral spring body 102, so that the left torque arm 101 and the left hook head 105 are both positioned above and to the left of the middle torque arm left arm part 107;

one end of the right arm 109 of the middle torsion arm is connected to the left side of the right coil spring body 103, and the right torsion arm 104 and the right arm 109 of the middle torsion arm both extend rearward of the right coil spring body 103, so that the right torsion arm 104 and the right hook 106 are both located right above the right arm 109 of the middle torsion arm;

the other end of the middle torque arm left arm portion 107 and the other end of the middle torque arm right arm portion 109 are connected to a middle torque arm transition portion 108 to form the middle torque arm, in this embodiment, the middle torque arm transition portion 108 is arc-shaped, and the middle torque arm is substantially V-shaped with rounded corners at the top;

this book ear auto-lock manipulator includes:

a grasping mechanism for grasping the intermediate torque arm transition 108;

a press-down mechanism for pushing down the left-hand torque arm 101 and the right-hand torque arm 104 to move the left-hand hook head 105 from the upper left of the middle-torque-arm left-hand arm 107 to the lower left of the middle-torque-arm left-hand arm 107 and to move the right-hand hook head 106 from the upper right of the middle-torque-arm right-hand arm 109 to the lower right of the middle-torque-arm right-hand arm 109;

a side pressing mechanism for pushing the left torque arm 101 pushed down by the pressing mechanism to the right so that the left hook head 105 is moved from the lower left of the middle torque arm left arm 107 to the right under the middle torque arm left arm 107, and for pushing the right torque arm 104 pushed down by the pressing mechanism to the left so that the right hook head 106 is moved from the lower right of the middle torque arm right arm 109 to the left under the middle torque arm right arm 109. At the moment, after the pressing action force of the pressing mechanism is removed, the left torsion arm moves upwards under the action of elastic force until the left hook head is hooked on the left arm part of the middle torsion arm, and meanwhile, the right torsion arm also moves upwards under the action of elastic force until the right hook head is hooked on the right arm part of the middle torsion arm, so that the left-hand buckling is realized.

This technical scheme can realize with the left side gib head back-off of left side torque arm on middle torque arm left side arm to with the right side gib head back-off of right side torque arm on middle torque arm right side arm, borrow this with injecing left side gib head and right side gib head, appear when avoiding two torsional springs to stack that left side gib head and right side gib head hook hang on other two torsional springs and lead to warping and be difficult to the phenomenon of separation, improve the reliability of product. And the mode of adopting mechanical structure realizes, reduces artifical use, and can improve production efficiency.

The grabbing mechanism comprises a finger cylinder 20 (also called a pneumatic finger or a pneumatic clamping jaw), and in the embodiment, the finger cylinder can adopt the prior art;

the upper jaw 201 and the lower jaw 202 of the finger cylinder grasp the intermediate torque arm transition 108 inserted between the upper jaw 201 and the lower jaw 202 when closed. The grabbing mechanism disclosed by the technical scheme is simple in structure and convenient to implement.

The upper jaw 201 or the lower jaw 202 of the finger cylinder is provided with a groove 203 for accommodating the intermediate torque arm transition 108. This technical scheme accepts middle torque arm transition portion through setting up the recess, and its reasonable in design can improve the stability of torque arm transition portion in the middle of the centre gripping.

In this embodiment, as shown in FIG. 8, the lower jaw 202 is provided with a recess 203, while the upper jaw 201 is not provided with a recess.

The grabbing mechanism further comprises a finger telescopic cylinder 30, the axis of a piston rod of the finger telescopic cylinder 30 is in a front-back direction, and a cylinder body of the finger cylinder 20 is fixedly installed on the piston rod of the finger telescopic cylinder 30, so that the finger telescopic cylinder 30 drives the finger cylinder 20 to extend forwards or retract backwards.

This technical scheme drives the switching of finger cylinder on the front and back position through setting up the flexible cylinder of finger, can realize snatching two torsional springs after on two torsional spring output position, bring back two torsional springs to the left-hand thread operating position on, its reasonable in design can cooperate current two torsional spring former (for example two torsional spring make-up machines, computer spring machine etc.) to use, and the output position of two torsional springs is the station of two torsional spring former output two torsional springs promptly.

The pressing mechanism comprises a pressing cylinder 40 and a pressing block 401, the pressing cylinder 40 is arranged above the grabbing mechanism, the pressing block 401 is fixedly arranged on a piston rod of the pressing cylinder 40, and the pressing cylinder 40 drives the pressing block 401 to descend or ascend to push or separate the left torsion arm 101 and the right torsion arm 104. The pushing mechanism disclosed by the technical scheme is simple in structure and convenient to implement.

In this embodiment, the left and right sides of the lower pressing block 401 respectively extend downwards to form a limiting stop portion 402, and the two limiting stop portions 402 can limit the left torsion arm 101 and the right torsion arm 104 to move outwards, so as to prevent the left torsion arm and the right torsion arm from moving outwards in the process of being pushed downwards by the lower pressing block to drop the lower pressing block, thereby causing the failure of pressing.

The side pressing mechanism comprises a left air pressing cylinder 50, a left pressing block 501, a right air pressing cylinder 60 and a right pressing block 601;

the left air cylinder 50 is arranged at the left side of the grabbing mechanism, the left press block 501 is fixedly arranged on a piston rod of the left air cylinder 50, and the left air cylinder 50 drives the left press block 501 to extend rightward or retract leftward so as to push or separate from the left torsion arm 101;

the right air cylinder 60 is disposed at the right side of the grabbing mechanism, the right press block 601 is fixedly mounted on the piston rod of the right air cylinder 60, and the right air cylinder 60 drives the right press block 601 to extend leftward or retract rightward to push or disengage the right torsion arm 104.

The lateral pressing mechanism disclosed by the technical scheme is simple in structure and convenient to implement.

The lug folding self-locking mechanical arm further comprises a bracket 70;

the cylinder body of the finger extension cylinder 30, the cylinder body of the hold-down cylinder 40, the cylinder body of the left air cylinder 50, and the cylinder body of the right air cylinder 60 are fixedly mounted on the bracket 70.

As shown in fig. 14, the bottom of the bracket 70 is provided with a support rod 701 for supporting the bracket 70, and the upper end of the support rod 701 is connected with the bracket 70 through a ball hinge 702;

the tail end of the bracket 70 is provided with a horizontal bracket 703, the horizontal bracket 703 is hinged with the tail end of the bracket 70 through a rotating shaft 704, and the axis of the rotating shaft 704 runs up and down.

This technical scheme can realize the regulation of the position of support to the position of two torsional spring former in the cooperation, reasonable in design adjusts in a flexible way.

In this embodiment, the support rod and the horizontal bracket are mounted on a third object (not shown).

As shown in fig. 9, the lug self-locking robot may be mounted adjacent to the double torsion spring forming apparatus 100 and adjusted in position to achieve the proper position by the bracket 70.

As shown in fig. 10 and 11, the finger cylinder 30 drives the finger cylinder 20 to extend forward to close the double torsion spring forming apparatus 100, and at this time, the middle torsion arm transition portion 108 of the double torsion spring located at the output position of the double torsion spring forming apparatus 100 is inserted between the upper jaw 201 and the lower jaw 202. The middle torque arm transition 108 is then grasped by the finger cylinder 20 actuating the upper jaw 201 and the lower jaw 202 closed.

As shown in fig. 12, finger retraction cylinder 30 causes finger cylinder 20 to retract rearwardly to retract finger cylinder 20 and the double torsion spring 10 captured by finger cylinder 20 to the left-hand operating position.

As shown in fig. 15a, the finger cylinder 20 grabs the double torsion spring 10 and returns to the left-hand operation position, ready to start the left-hand operation; the state of the double torsion spring 10 at this time is shown in fig. 20a to 20 c;

as shown in fig. 16a, the depressing cylinder 40 drives the depressing block 401 to descend, and the depressing block 401 pushes the left torsion arm 101 and the right torsion arm 104 downward during the descending process, so that the left hook head 105 moves downward from the upper left of the middle torsion arm left arm portion 107 to the lower left of the middle torsion arm left arm portion 107, and the right hook head 106 moves downward from the upper right of the middle torsion arm right arm portion 109 to the lower right of the middle torsion arm right arm portion 109; the state of the double torsion spring 10 at this time is shown in fig. 21a to 21 c;

after the lower pressing block 401 is lowered to the predetermined position, the left pressing cylinder 50 drives the left pressing block 501 to extend rightward to push the left torque arm 101 to move rightward, so that the left hook head 105 moves rightward from the lower left of the middle torque arm left arm portion 107 to the position right below the middle torque arm left arm portion 107; meanwhile, the right pressing cylinder 60 drives the right pressing block 601 to extend leftwards to push the right torque arm 104 to move leftwards, so that the right hook head 106 moves leftwards from the right lower part of the right arm part 109 of the middle torque arm to the right lower part of the right arm part 109 of the middle torque arm; the state of the double torsion spring 10 at this time is shown in fig. 22a to 22 c;

as shown in fig. 18a, after the left press block 501 moves to the right to reach the preset position and the right press block 601 moves to the left to reach the preset position, the lower press cylinder 40 drives the lower press block 401 to ascend, the lower press block 401 is separated from the left torque arm 101 and the right torque arm 104, the left torque arm 101 moves upwards under the action of the elastic force until the left hook head 105 is hooked on the left arm part 107 of the middle torque arm, and the right torque arm 104 also moves upwards under the action of the elastic force until the right hook head 106 is hooked on the right arm part 109 of the middle torque arm, thereby completing the back-buckling operation; the state of the double torsion spring 10 at this time is shown in fig. 23a to 23 c;

thereafter, the left air cylinder 50 drives the left press block 501 to retract leftwards to disengage the left torsion arm 101 from the left press block 501, and the right air cylinder 60 drives the right press block 601 to retract rightwards to disengage the right press block 601 from the right torsion arm 104; the double torsion spring 10 which is reversely buckled can be taken down by the finger cylinder 20 driving the upper clamping jaw 201 and the lower clamping jaw 202 to be opened.

In this embodiment, the left torsion arm 101 and the right torsion arm 104 of the double-torsion spring are equivalent to two ears of the double-torsion spring, and the left torsion arm 101 and the right torsion arm 104 achieve the self-locking effect after being reversely buckled, so that the manipulator is named as a folding-ear self-locking manipulator.

Claims (9)

1. A folding lug self-locking mechanical arm is used for processing a double torsion spring;

the double torsion spring comprises a left torsion arm, a left spiral spring body, a middle torsion arm, a right spiral spring body and a right torsion arm;

one end of the left torsion arm is connected to the left side of the left spiral spring body, the other end of the left torsion arm is a free end, and the free end of the left torsion arm is provided with a left hook head bent towards the right side of the left spiral spring body;

one end of the right torsion arm is connected with the right side of the right spiral spring body, the other end of the right torsion arm is a free end, and the free end of the right torsion arm is provided with a right hook head bent towards the left side of the right spiral spring body;

the middle torque arm is positioned between the right side of the left spiral spring body and the left side of the right spiral spring body and comprises a middle torque arm left arm part, a middle torque arm transition part and a middle torque arm right arm part;

one end of the left arm part of the middle torque arm is connected with the right side of the left spiral spring body, and the left torque arm and the left arm part of the middle torque arm both extend to the rear of the left spiral spring body, so that the left torque arm and the left hook head are both positioned above the left arm part of the middle torque arm;

one end of the right arm part of the middle torque arm is connected with the left side of the right spiral spring body, and the right torque arm and the right arm part of the middle torque arm both extend towards the rear of the right spiral spring body, so that the right torque arm and the right hook head are both positioned at the upper right part of the right arm part of the middle torque arm;

the other end of the left arm part of the middle torque arm and the other end of the right arm part of the middle torque arm are simultaneously connected with the transition part of the middle torque arm;

the transition part of the middle torsion arm is arc-shaped;

its characterized in that, this book ear auto-lock manipulator includes:

the grabbing mechanism is used for grabbing the middle torsion arm transition part;

a pressing mechanism for pushing the left torsion arm and the right torsion arm downwards to make the left hook head move downwards from the upper left of the left arm part of the middle torsion arm to the lower left of the left arm part of the middle torsion arm and make the right hook head move downwards from the upper right of the right arm part of the middle torsion arm to the lower right of the right arm part of the middle torsion arm;

and the lateral pressing mechanism is used for pushing the left torsion arm pushed downwards by the pressing mechanism rightwards so that the left hook head moves from the left lower part of the left arm part of the middle torsion arm to the right under the left arm part of the middle torsion arm, and pushing the right torsion arm pushed downwards by the pressing mechanism leftwards so that the right hook head moves from the right lower part of the right arm part of the middle torsion arm to the left under the right arm part of the middle torsion arm.

2. The knuckle self-locking manipulator according to claim 1, wherein:

the grabbing mechanism comprises a finger cylinder;

the middle torque arm transition part between the upper clamping jaw and the lower clamping jaw is grabbed and inserted when the upper clamping jaw and the lower clamping jaw of the finger cylinder are closed.

3. The knuckle self-locking manipulator according to claim 2, wherein:

the upper clamping jaw or the lower clamping jaw of the finger cylinder is provided with a groove for accommodating the transition part of the middle torsion arm.

4. The knuckle self-locking manipulator according to claim 2, wherein: the grabbing mechanism further comprises a finger telescopic cylinder, and a cylinder body of the finger cylinder is fixedly arranged on a piston rod of the finger telescopic cylinder, so that the finger telescopic cylinder drives the finger cylinder to extend forwards or retract backwards.

5. The knuckle self-locking manipulator according to claim 4, wherein:

this pushing down mechanism includes air cylinder and briquetting down, and this air cylinder locates the top of snatching the mechanism down, and this briquetting is installed on air cylinder's piston rod down fixedly, and this air cylinder orders about briquetting down and descends or rises in order to promote or break away from left side torque arm and right side torque arm down.

6. The knuckle self-locking manipulator according to claim 5, wherein:

the side pressing mechanism comprises a left pressing cylinder, a left pressing block, a right pressing cylinder and a right pressing block;

the left pressure cylinder is arranged on the left side of the grabbing mechanism, the left pressing block is fixedly arranged on a piston rod of the left pressure cylinder, and the left pressing cylinder drives the left pressing block to extend rightward or retract leftward so as to push or separate from the left torsion arm;

the right pressing cylinder is arranged on the right side of the grabbing mechanism, the right pressing block is fixedly arranged on a piston rod of the right pressing cylinder, and the right pressing cylinder drives the right pressing block to extend leftwards or retract rightwards so as to push or separate from the right torsion arm.

7. The knuckle self-locking manipulator according to claim 6, wherein:

the ear folding self-locking manipulator also comprises a bracket;

the cylinder body of the finger telescopic cylinder, the cylinder body of the lower air cylinder, the cylinder body of the left air cylinder and the cylinder body of the right air cylinder are all fixedly arranged on the bracket.

8. The knuckle self-locking manipulator according to claim 7, wherein:

the bottom of the bracket is provided with a supporting rod for supporting the bracket, and the upper end of the supporting rod is connected with the bracket through a ball hinge;

the tail end of the bracket is provided with a horizontal bracket, the horizontal bracket is hinged with the tail end of the bracket through a rotating shaft, and the axis of the rotating shaft moves up and down.

9. The knuckle self-locking manipulator according to claim 5, wherein: the left side and the right side of the lower pressing block respectively extend downwards to form a limiting stop part.

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