Spring machine for producing and machining variable-diameter spring

Abstract

The invention belongs to the technical field of spring manufacturing, and particularly relates to a variable-diameter spring producing and machining spring machine which comprises a supporting plate, a round block and a control mechanism are arranged on the right portion of the supporting plate, two guide rails penetrating front and back are connected to the lower portion of the supporting plate, a row of sliding blocks sliding front and back are arranged between the two guide rails, and a pushing mechanism used for pushing the sliding blocks is arranged on the guide rails. Lifting rods sliding up and down are arranged on the sliding blocks, elastic pieces are arranged between the lifting rods and the sliding blocks, the lifting rods are connected with cutters slidably connected to the sliding blocks, the lower portion of the supporting plate is connected with a second electric push rod, and a telescopic rod of the second electric push rod is connected with an ejector rod used for ejecting the lifting rods. The two pairs of electric rotating wheels and the two straightening blocks all have closing and opening states, the steel wire placing process is more convenient and faster, the steel wire is effectively straightened through the straightening channel with the large left part and the small right part, then a variable-diameter spring is produced through a control mechanism, a sliding block is pushed under the action of a synchronous belt and a separation block, rapid replacement of a cutter is automatically completed, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of spring manufacturing, and particularly relates to a spring machine for the production and processing of variable-diameter springs. Background Art

[0002] In the field of spring production and processing, a spring machine refers to a mechanical device for producing springs. Existing spring machines mainly consist of a straightening mechanism, a variable-diameter mechanism, a pitch-changing mechanism, a cutting mechanism, and a feeding mechanism. For example, a Chinese patent with the publication number CN118080741B discloses a spring machine for the production and processing of variable-diameter springs. However, existing spring machines have the following defects: (1) When placing the steel wire, it is necessary to manually pass the free end of the steel wire between the straightening rollers. There is a lack of a convenient structure to easily place the steel wire in place, and the straightening effect is limited by simply straightening the steel wire through the straightening rollers. (2) When it is necessary to replace the tool, the spring machine often requires manual operation, making it difficult to quickly replace the tool. The tool switching efficiency is low, and there may also be situations of operation errors, affecting the overall production efficiency. Summary of the Invention

[0003] To solve the problems raised in the above background art, the present invention provides a spring machine for the production and processing of variable-diameter springs.

[0004] A spring machine for the production and processing of variable-diameter springs includes a support plate. A round block and a control mechanism are provided on the right part of the support plate. Two guide rails running through front and back are connected to the lower part of the support plate. A row of sliders sliding front and back is provided between the two guide rails. A pushing mechanism for pushing the sliders is provided on the guide rails. Lifting rods sliding up and down are provided on the sliders. An elastic member is provided between the lifting rods and the sliders. Tools slidingly connected to the sliders are connected to the lifting rods. An electric push rod two is connected to the lower part of the support plate. A top rod for jacking up the lifting rods is connected to the telescopic rod of the electric push rod two.

[0005] Optionally, the control mechanism includes an electric push rod one, a pressure head one, a pressure head two, and a pitch head. A pressure head one sliding obliquely upward, a pressure head two sliding left and right, and a pitch head sliding up and down are provided on the front side of the support plate. The pressure head one, the pressure head two, and the pitch head all face the round block. Three electric push rods one are connected to the support plate. The telescopic rods of the three electric push rods one are respectively connected to the pressure head one, the pressure head two, and the pitch head.

[0006] Optionally, the pushing mechanism includes a mounting plate. The mounting plate is connected to one of the guide rails. Synchronous wheels are installed at both ends of the mounting plate. A synchronous belt is wound between the two synchronous wheels. A circle of partition blocks is connected to the synchronous belt at intervals. The sliders are all located between two adjacent partition blocks.

[0007] Optionally, the spring machine for the production and processing of variable-diameter springs further includes a guide bar. The guide bar is connected to the end of the round block.

[0008] Optionally, the spring machine for manufacturing variable-diameter springs further includes a fixed plate. The left part of the support plate is connected to the fixed plate. An elevating plate that slides up and down is provided on the upper part of the support plate. A pair of electric rotating wheels are installed on both the fixed plate and the elevating plate. The electric rotating wheels all have grooves. The upper part of the support plate is connected to an electric push rod three. The telescopic rod of the electric push rod three is connected to the elevating plate.

[0009] Optionally, the spring machine for manufacturing variable-diameter springs further includes straightening blocks. The straightening blocks are connected to both the fixed plate and the elevating plate. Straightening grooves are formed on one side of the two straightening blocks that are close to each other. The width of the straightening groove in the front-rear direction gradually decreases from left to right.

[0010] Optionally, the spring machine for manufacturing variable-diameter springs further includes a guiding platform. The guiding platform is connected to the support plate. A straight groove is formed at the top of the guiding platform. A distance sensor is installed above the left part of the guiding platform. An electric push rod four is installed above the right part of the guiding platform. A pressing plate is connected to the telescopic rod of the electric push rod four.

[0011] Optionally, the spring machine for manufacturing variable-diameter springs further includes a limiting mechanism. The limiting mechanism includes a fixed disk. The left part of the support plate is connected to the fixed disk. Four straight holes distributed in a cross shape are formed on the fixed disk. Sliding limiting slide rods are provided at the straight holes. One ends of the four limiting slide rods that are close to each other are rotatably connected to a first convex block. A rotating shaft is rotatably connected to the center of the fixed disk. A turntable is connected to the front end of the rotating shaft. Four inclined holes are formed on the turntable. The four first convex blocks are respectively located in the four inclined holes.

[0012] Optionally, the limiting mechanism further includes a connecting plate, a rotating block and a second convex block. The connecting plate is connected to the elevating plate. The lower end of the connecting plate is rotatably connected to the second convex block. The rotating block is connected to the rear end of the rotating shaft. A long hole is formed on the rotating block. The second convex block is located in the long hole.

[0013] The beneficial effects of the present invention are as follows: 1. The two pairs of electric rotating wheels and the two straightening blocks are both in a closed state and an open state. The process of placing the steel wire is more convenient. The steel wire is effectively straightened through the left-large-right-small straightening channel, and then a variable-diameter spring is produced through the control mechanism. Under the action of the synchronous belt and the partition block, the slider is pushed, and the rapid replacement of the tool is automatically completed, improving the production efficiency.

[0014] 2. When the two pairs of electric rotating wheels are opened, the four limiting slide rods are retracted, and a coil of steel wire is sleeved on the fixed disk. When the two pairs of electric rotating wheels are closed, the four limiting slide rods are unfolded to limit the steel wire sleeved on the fixed disk, which is beneficial to the smooth progress of the variable-diameter spring production work and has high synchronism.

[0015] 3. After the steel wire continuously passes through the straightening channel, the steel wire enters the straight groove, and the distance sensor detects the distance between it and the steel wire. If the detected distance between the distance sensor and the steel wire decreases, the controller controls the electric push rod four to drive the pressing plate to flatten the bent part of the steel wire, which is beneficial to the subsequent production of the variable-diameter spring. Brief Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a front view after the guide bar of the present invention is hidden.

[0018] Figure 3 For the present invention Figure 2 It is a schematic diagram of the structure from the rear view angle in the present invention.

[0019] Figure 4 It is a schematic diagram of the structure of the round block, guide bar and control mechanism of the present invention.

[0020] Figure 5 It is a schematic diagram of the structure of the guide rail, slider, pushing mechanism, lifting rod, cutter, electric push rod two and ejector rod of the present invention.

[0021] Figure 6 It is a schematic diagram of the connection relationship of the pushing mechanism of the present invention.

[0022] Figure 7 It is a schematic diagram of the structure of the fixing plate, lifting plate, electric rotating wheel, electric push rod three and straightening block of the present invention.

[0023] Figure 8 It is a schematic diagram of the structure of the straightening block of the present invention.

[0024] Figure 9 It is a schematic diagram of the structure of the guide table, distance sensor, electric push rod four and pressing plate of the present invention.

[0025] Figure 10 It is a schematic diagram of the structure of the limiting mechanism, connecting plate and rotating block of the present invention.

[0026] Figure 11 For the present invention Figure 10 The explosion diagram in it.

[0027] Figure 12 For the present invention Figure 11 The enlarged view at position A in it.

[0028] Labels in the attached drawings: 1 - support plate, 2 - round block, 20 - steel wire, 21 - guide bar, 3 - control mechanism, 30 - first electric push rod, 31 - first pressing head, 32 - second pressing head, 33 - pitch head, 4 - guide rail, 5 - slider, 51 - mounting plate, 52 - synchronous pulley, 53 - synchronous belt, 54 - partition block, 6 - lifting rod, 7 - cutting tool, 8 - second electric push rod, 9 - ejector rod, 101 - fixing plate, 102 - lifting plate, 103 - electric rotating wheel, 104 - groove, 105 - third electric push rod, 111 - straightening block, 112 - straightening groove, 121 - guide platform, 122 - straight groove, 123 - distance sensor, 124 - fourth electric push rod, 125 - pressing plate, 131 - fixed disk, 132 - straight hole, 133 - limiting slide bar, 134 - first convex block, 135 - rotating shaft, 136 - turntable, 137 - inclined hole, 141 - connecting plate, 142 - rotating block, 143 - second convex block, 144 - long hole. Detailed implementation manners

[0029] The following describes the implementation manners of the present invention with reference to the attached drawings.

[0030] Example 1: A spring machine for manufacturing variable-diameter springs. Refer to Figures 1-6 , which includes a support plate 1, a round block 2, a control mechanism 3, a guide rail 4, a slider 5, a pushing mechanism, a lifting rod 6, a cutting tool 7, a second electric push rod 8 and an ejector rod 9. The right part of the support plate 1 is connected with a round block 2. The right part of the support plate 1 is provided with a control mechanism 3. The lower part of the support plate 1 is connected with two guide rails 4 that penetrate through from front to back. Between the two guide rails 4, there is a row of sliders 5 that slide back and forth. On the guide rails 4, there is a pushing mechanism for pushing the sliders 5. On each slider 5, there is a lifting rod 6 that slides up and down. Between the lifting rod 6 and the slider 5, there is an elastic member, and the elastic member is a return spring. On each lifting rod 6, there is a cutting tool 7 connected. The cutting tool 7 is slidably connected to the slider 5. At the lower part of the front side of the support plate 1, a second electric push rod 8 is bolted. On the telescopic rod of the second electric push rod 8, there is an ejector rod 9 for jacking up the lifting rod 6.

[0031] Refer to Figure 2 and Figure 4 , the control mechanism 3 includes a first electric push rod 30, a first pressing head 31, a second pressing head 32 and a pitch head 33. On the front side of the support plate 1, there is a first pressing head 31 that slides obliquely upward, a second pressing head 32 that slides left and right, and a pitch head 33 that slides up and down. The first pressing head 31, the second pressing head 32 and the pitch head 33 all face the round block 2. On the front side of the support plate 1, three first electric push rods 30 are bolted. The telescopic rods of the three first electric push rods 30 are respectively connected with the first pressing head 31, the second pressing head 32 and the pitch head 33. The specific principle of the control mechanism 3 is prior art.

[0032] Refer to Figure 5 and Figure 6, the driving mechanism includes a mounting plate 51, a synchronous pulley 52, a synchronous belt 53 and a partition block 54. The mounting plate 51 is fixedly connected to the left guide rail 4. Synchronous pulleys 52 driven by a reduction motor are installed at both ends of the mounting plate 51. A synchronous belt 53 is wound between the two synchronous pulleys 52. A circle of partition blocks 54 are connected to the synchronous belt 53 at intervals. The sliders 5 are all located between two adjacent partition blocks 54. Before producing the variable-diameter spring, control the reduction motor to rotate the synchronous pulley 52 and the synchronous belt 53, and pre-place a row of sliders 5 between two adjacent partition blocks 54 for subsequent rapid tool replacement of the tool 7.

[0033] Reference Figure 1 and Figure 4 , the spring machine for producing and processing variable-diameter springs further includes a guide bar 21, and the front end of the round block 2 is connected to the guide bar 21.

[0034] Reference Figure 1 、 Figure 2 、 Figure 3 and Figure 7 , the spring machine for producing and processing variable-diameter springs further includes a fixed plate 101, a lifting plate 102, an electric rotating wheel 103 and an electric push rod three 105. The fixed plate 101 is fixedly connected to the left part of the front side of the support plate 1. The lifting plate 102 that slides up and down is provided at the upper part of the front side of the support plate 1. A pair of electric rotating wheels 103 driven by a driving motor are installed on the front sides of the fixed plate 101 and the lifting plate 102. The electric rotating wheels 103 all have grooves 104. The electric push rod three 105 is bolted to the upper part of the rear side of the support plate 1, and the telescopic rod of the electric push rod three 105 is connected to the lifting plate 102.

[0035] Reference Figure 2 、 Figure 7 and Figure 8 , the spring machine for producing and processing variable-diameter springs further includes a straightening block 111. The straightening blocks 111 are fixedly connected to the front sides of the fixed plate 101 and the lifting plate 102. Straightening grooves 112 are formed on one side of the two straightening blocks 111 close to each other, and the width of the straightening groove 112 in the front-rear direction gradually decreases from left to right.

[0036] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 10 、 Figure 11 and Figure 12, the spring machine for variable-diameter spring production and processing further includes a limiting mechanism. The limiting mechanism includes a fixed disk 131, a limiting slide bar 133, a first convex block 134, a rotating shaft 135, and a turntable 136. The left part of the support plate 1 is fixedly connected with the fixed disk 131. Four straight holes 132 distributed in a cross shape are formed on the fixed disk 131. Limiting slide bars 133 that slide are provided at the straight holes 132. One ends of the four limiting slide bars 133 close to each other are rotatably connected with the first convex blocks 134. The center of the fixed disk 131 is rotatably connected with the rotating shaft 135. The front end of the rotating shaft 135 is fixedly connected with the turntable 136. Four inclined holes 137 are formed on the turntable 136. The four first convex blocks 134 are respectively located in the four inclined holes 137. The limiting mechanism further includes a connecting plate 141, a rotating block 142, and a second convex block 143. The rear side of the lifting plate 102 is fixedly connected with the connecting plate 141. The lower end of the connecting plate 141 is rotatably connected with the second convex block 143. The rear end of the rotating shaft 135 is fixedly connected with the rotating block 142. A long hole 144 is formed on the rotating block 142. The second convex block 143 is located in the long hole 144.

[0037] First step, control the electric push rod three 105 to drive the lifting plate 102 to rise, driving the connecting plate 141, the second convex block 143, the upper straightening block 111, and the upper pair of electric rotating wheels 103 to move upward synchronously. The two pairs of electric rotating wheels 103 become in an open state, and the two straightening blocks 111 become in an open state. Since the second convex block 143 is located in the long hole 144, the upward-moving second convex block 143 will pull the rotating block 142 to rotate clockwise, driving the rotating shaft 135 and the turntable 136 to rotate clockwise together. Since the first convex block 134 is located at the end of the inclined hole 137 far from the rotating shaft 135, the rotating turntable 136 can make the first convex block 134 move along the straight hole 132 in the direction close to the rotating shaft 135. The first convex block 134 drives the four limiting slide bars 133 to slide in the direction close to the rotating shaft 135, and the four limiting slide bars 133 are retracted.

[0038] Second step, put a coil of steel wire 20 on the fixed disk 131. The free end of the steel wire 20 is placed in the groove 104 of the lower pair of electric rotating wheels 103 and the straightening groove 112 of the lower straightening block 111. Control the electric push rod three 105 to make the lifting plate 102, the connecting plate 141, the second convex block 143, the upper straightening block 111, and the upper pair of electric rotating wheels 103 move downward synchronously to reset. On the contrary, the four limiting slide bars 133 slide in the direction away from the rotating shaft 135 to the initial position, and the four limiting slide bars 133 are unfolded. The steel wire 20 sleeved on the fixed disk 131 is limited by the four limiting slide bars 133. And the upper pair of electric rotating wheels 103 is in contact with the steel wire 20. The two pairs of electric rotating wheels 103 are closed, and the two straightening blocks 111 are closed. The two straightening grooves 112 form a straightening channel with a larger left side and a smaller right side, and the steel wire 20 passes through the straightening channel.

[0039] In the third step, control the drive motor to drive the electric rotating wheel 103 to rotate. The electric rotating wheel 103 conveys the steel wire 20 to the right. Under the cooperative action of the electric rotating wheel 103 and the straightening channel, the steel wire 20 is straightened, the bending deformation of the steel wire 20 is eliminated, and the steel wire 20 is ensured to be straight. Then, the steel wire 20 reaches around the round block 2. Control the first electric push rod 30 to drive the first pressing head 31, the second pressing head 32 and the pitch head 33 to move towards the direction close to the round block 2. The specific positions of the first pressing head 31, the second pressing head 32 and the pitch head 33 are adjusted according to the variable-diameter spring parameters.

[0040] In the fourth step, after a variable-diameter spring is produced, control the second electric push rod 8 to drive the ejector rod 9 to move upward. The ejector rod 9 jacks up the frontmost lifting rod 6, drives the frontmost cutter 7 to move upward, and the return spring deforms. Under the cooperation of the cutter 7 and the round block 2, the cutter 7 cuts off the steel wire 20. The variable-diameter spring is sleeved on the guide bar 21, and the variable-diameter spring falls along the direction of the guide bar 21, effectively preventing the falling variable-diameter spring from bouncing up, thus facilitating the collection of the produced variable-diameter spring.

[0041] In the fifth step, when the cutting edge of the cutter 7 is damaged and the cutting effect is poor, the cutter 7 needs to be replaced. Control the reduction motor to drive the synchronous pulley 52 to rotate clockwise, so that the synchronous belt 53 rotates clockwise. The partition block 54 rotates clockwise around the synchronous belt 53. The partition block 54 pushes the slider 5 to slide forward, drives the lifting rod 6 and the cutter 7 to move forward. The frontmost slider 5 and the cutter 7 are separated from the partition block 54, and the next cutter 7 moves to directly below the round block 2, and the next lifting rod 6 moves directly above the ejector rod 9, thus automatically completing the rapid replacement of the cutter 7.

[0042] In this way, the two pairs of electric rotating wheels 103 and the two straightening blocks 111 both have the closed and open states. The placement process of the steel wire 20 is more convenient, and the steel wire 20 is effectively straightened through the straightening channel. Then, the variable-diameter spring is produced by the control mechanism 3. Under the action of the synchronous belt 53 and the partition block 54, the slider 5 is pushed, and the rapid replacement of the cutter 7 is automatically completed, improving the production efficiency.

[0043] Embodiment 2: On the basis of Embodiment 1, referring to Figure 1 , Figure 2 and Figure 9 , the spring machine for producing variable-diameter springs further includes a guide table 121, a distance sensor 123, a fourth electric push rod 124 and a pressing plate 125. The front side of the support plate 1 is fixedly connected with a guide table 121. A straight groove 122 is opened at the top of the guide table 121. A distance sensor 123 is installed above the left part of the guide table 121. The distance sensor 123 is internally provided with a controller (not shown in the figure). A fourth electric push rod 124 is installed above the right part of the guide table 121. The distance sensor 123 and the fourth electric push rod 124 are both electrically connected to the controller. A pressing plate 125 is connected to the telescopic rod of the fourth electric push rod 124.

[0044] After the steel wire 20 continuously passes through the straightening channel, the steel wire 20 enters the straight groove 122, and the distance between the distance sensor 123 and the steel wire 20 is detected. If the detected distance between the distance sensor 123 and the steel wire 20 decreases, it means that the steel wire 20 has a bent part. At this time, the controller controls the electric push rod four 124 to drive the pressing plate 125 to move downward, and the pressing plate 125 presses the steel wire 20 downward. With the cooperation of the distance sensor 123 and the electric push rod four 124, the pressing plate 125 automatically flattens the bent part of the steel wire 20, which is beneficial to the subsequent production of variable-diameter springs.

[0045] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A spring machine for producing and processing a variable diameter spring, comprising a support plate (1), wherein a round block (2) and a control mechanism (3) are provided on the right side of the support plate (1), wherein: The lower part of the support plate (1) is connected to two guide rails (4) extending forward and backward, a row of sliders (5) sliding forward and backward is provided between the two guide rails (4), a pushing mechanism for pushing the sliders (5) is provided on the guide rails (4), a lifting rod (6) sliding up and down is provided on the sliders (5), an elastic member is provided between the lifting rod (6) and the sliders (5), a tool (7) slidably connected to the sliders (5) is connected to the lifting rods (6), the lower part of the support plate (1) is connected to a second electric push rod (8), and a push rod (9) for lifting the lifting rod (6) is connected to the telescopic rod of the second electric push rod (8).

2. A spring machine for producing and processing variable diameter springs according to claim 1, characterized in that: The control mechanism (3) comprises an electric push rod (30), a pressure head (31), a pressure head (32) and a pitch head (33); the front side of the support plate (1) is provided with a pressure head (31) that slides obliquely upward, a pressure head (32) that slides leftward and rightward, and a pitch head (33) that slides up and down; the pressure head (31), the pressure head (32) and the pitch head (33) are all facing the round block (2); the support plate (1) is connected to three electric push rods (30); and the telescopic rods of the three electric push rods (30) are respectively connected to the pressure head (31), the pressure head (32) and the pitch head (33).

3. A spring machine for producing and processing variable diameter springs according to claim 2, characterized in that: The pushing mechanism comprises a mounting plate (51), wherein one guide rail (4) is connected to the mounting plate (51), both ends of the mounting plate (51) are mounted with synchronous wheels (52), a synchronous belt (53) is wound between the two synchronous wheels (52), a circle of partition blocks (54) are connected to the synchronous belt (53) at intervals, and the sliders (5) are located between two adjacent partition blocks (54).

4. A spring machine for producing and processing variable diameter springs according to claim 3, characterized in that: The spring machine for producing and processing variable diameter springs further comprises a guide bar (21), and the end of the round block (2) is connected to the guide bar (21).

5. A spring machine for producing and processing variable diameter springs according to claim 4, characterized in that: The spring machine for producing and processing variable diameter springs also includes a fixed plate (101), the left part of the support plate (1) is connected to the fixed plate (101), the upper part of the support plate (1) is provided with a lifting plate (102) that slides up and down, the fixed plate (101) and the lifting plate (102) are both mounted with a pair of electric rotating wheels (103), the electric rotating wheels (103) both have grooves (104), the upper part of the support plate (1) is connected to an electric push rod three (105), and the telescopic rod of the electric push rod three (105) is connected to the lifting plate (102).

6. A spring machine for producing and processing variable diameter springs according to claim 5, characterized in that: The spring machine for producing and processing variable diameter springs also includes a straightening block (111), the straightening blocks (111) are connected to the fixed plate (101) and the lifting plate (102), and straightening grooves (112) are formed on the sides of the two straightening blocks (111) close to each other, and the width of the straightening grooves (112) in the front-to-back direction gradually decreases from left to right.

7. A spring machine for producing and processing variable diameter springs according to claim 6, characterized in that: The spring machine for producing and processing variable diameter springs also includes a guide table (121), the guide table (121) is connected to the support plate (1), a straight groove (122) is formed on the top of the guide table (121), a distance sensor (123) is installed on the upper left part of the guide table (121), an electric push rod four (124) is installed on the upper right part of the guide table (121), and a pressing plate (125) is connected to the telescopic rod of the electric push rod four (124).

8. A spring machine for producing and processing variable diameter springs according to claim 7, characterized in that: The spring machine for producing and processing variable diameter springs also includes a limiting mechanism, the limiting mechanism including a fixed disk (131), the left part of the support plate (1) is connected to the fixed disk (131), the fixed disk (131) is provided with four straight holes (132) distributed in a cross shape, the straight holes (132) are each provided with a sliding limiting slide bar (133), the ends of the four limiting slide bars (133) close to each other are rotatably connected to a protrusion 1 (134), the center of the fixed disk (131) is rotatably connected to a rotating shaft (135), the front end of the rotating shaft (135) is connected to a rotating disk (136), the rotating disk (136) is provided with four inclined holes (137), and the four protrusions 1 (134) are respectively located in the four inclined holes (137).

9. A spring machine for producing and processing variable diameter springs according to claim 8, characterized in that: The limiting mechanism further comprises a connecting plate (141), a rotating block (142) and a second protrusion (143); the lifting plate (102) is connected to the connecting plate (141); the lower end of the connecting plate (141) is rotatably connected to the second protrusion (143); the rear end of the rotating shaft (135) is connected to the rotating block (142); a long hole (144) is formed on the rotating block (142); and the second protrusion (143) is located in the long hole (144).

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