Elastic material blocking mechanism of buckling die

Abstract

The utility model relates to the technical field of buckling dies, in particular to an elastic material blocking mechanism of a buckling die, which comprises a base, an elastically telescopic supporting assembly and a material blocking plate assembly, the supporting assembly is provided with a fixed end and a telescopic end, the fixed end is elastically and telescopically connected with the telescopic end, the fixed end is arranged on the base, and the material blocking plate assembly is arranged on the base. And the striker plate assembly is mounted on the telescopic end. The buckling die elastic material blocking mechanism can limit the positions of the car door assembly parts, and the problem that the positions of the car door assembly parts are changed disorderly after the car door assembly parts enter a die working area is solved. The supporting assembly can drive the striker plate assembly to descend under the acting force of the upper die pressing block, after the acting force acting on the supporting assembly disappears, the supporting assembly can drive the striker plate assembly to reset, and therefore the conveying and stopping problems of the automobile door assembly parts can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of snap-fit ​​moulds, in particular to an elastic material blocking mechanism for a snap-fit ​​mould. Background Art

[0002] Belt transmission buckle mold closing is still the main way of door assembly closing. This method requires the door assembly parts to be sent from the feeding side to the cavity, and then sent from the cavity to the discharge side. Since the feeding height of the door assembly parts is relatively high and the position may change disorderly after entering the mold working area, a lifting material blocking mechanism is required to block the parts in the working state and exit the upper mold interference area in the retracting state. Utility Model Content

[0003] One of the purposes of the utility model is to provide an elastic material blocking mechanism for a buckle mold to solve the problem that in the belt transmission buckle mold hemming process of the prior art, the feeding height of the door assembly parts is relatively high, and after the door assembly parts enter the working area of ​​the mold, the positions of the door assembly parts on both sides of the mold may change disorderly.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A snap-fit ​​mold elastic material blocking mechanism comprises a base, an elastically retractable support component and a material blocking plate component, wherein the support component has a fixed end and a retractable end, the fixed end is elastically and telescopically connected to the retractable end, the fixed end is mounted on the base, and the material blocking plate component is mounted on the retractable end.

[0006] According to the above technical means, when in use, a set of elastic material blocking mechanisms of the locking mold are installed on both sides of the mold. When the stamping starts, the material blocking plate assembly is in a jacking state, and the material blocking plate assembly rises to limit the positions of the door assembly parts on both sides. At this time, the upper mold block moves downward, and the telescopic end of the support assembly contracts after receiving the pressure of the upper mold block. The telescopic end drives the material blocking plate assembly to descend during the contraction process. When the upper mold block moves to the dead point position, the telescopic end drives the material blocking plate assembly to move to the lowest position. When the upper mold block moves upward, due to the elastic telescopic connection between the fixed end and the telescopic end, the telescopic end drives the material blocking plate assembly to move upward to complete a stamping action. In this technical solution, the elastic material blocking mechanism of the locking mold can limit the position of the door assembly parts, solving the problem that the position of the door assembly parts will change disorderly after entering the working area of ​​the mold. Under the action of the upper mold block, the telescopic end can drive the material blocking plate assembly to descend, and after the force acting on the support assembly disappears, the telescopic end can drive the material blocking plate assembly to reset.

[0007] Furthermore, the supporting assembly includes a sleeve, an elastic member and a guide rod, the sleeve is mounted on the base, the elastic member is accommodated in the sleeve, one end of the guide rod is accommodated in the sleeve and in contact with the elastic member, and the other end of the guide rod is exposed outside the sleeve and connected to the baffle plate assembly; the fixed end is formed at the end of the sleeve connected to the base, and the telescopic end is formed at the end of the guide rod exposed outside the sleeve.

[0008] According to the above technical means, when stamping starts, the baffle plate assembly is in a jacking state, and the telescopic end of the baffle plate assembly rises to limit the positions of the door assembly parts on both sides. At this time, the upper mold block moves downward, and the guide rod contracts into the sleeve after being subjected to the pressure of the upper mold block. The guide rod drives the baffle plate assembly down during the contraction process. When the upper mold block moves to the dead point position, the guide rod drives the baffle plate assembly to move to the lowest position, and the elastic member is compressed to the maximum position. When the upper mold block moves upward, the elastic member restores the deformation, and the elastic member pushes the guide rod to drive the baffle plate assembly to move upward, completing a stamping action. In this technical solution, the elastic member can be used to realize automatic resetting of the guide rod.

[0009] Furthermore, a guide pin is installed in the sleeve, and the elastic member is a spring, and the spring is sleeved on the guide pin.

[0010] According to the above technical means, since a guide pin is installed in the sleeve and the spring is sleeved on the guide pin, the spring can still be sleeved on the guide pin during the contraction of the spring, thereby ensuring that the deformation of the spring is more stable during the compression process.

[0011] Furthermore, one end of the guide rod located at the sleeve is connected to a support block, and the support block is in contact with the upper end of the elastic member.

[0012] According to the above technical means, during the downward movement of the upper mold block, the pressure of the upper mold block is transmitted to the support block and the elastic part through the guide rod. Due to the large contact area between the support block and the elastic part, the elastic part is subjected to a more balanced force and the deformation of the elastic part is also stable.

[0013] Furthermore, the support block includes a guide surface that can slide along the inner wall of the sleeve and a groove arranged on the longitudinal geometric center line of the support block, the bottom of the guide rod is inserted into the groove, the elastic member is a spring, and the outer convex surface of the bottom of the groove extends into the cavity where the inner diameter of the spring is located.

[0014] According to the above technical means, since the support block is provided with a groove, one end of the guide rod located in the sleeve can be plugged into the groove, thereby realizing the connection between the guide rod and the support block. Since the outer convex surface extends into the cavity where the inner diameter of the spring is located, the bottom surface located at the outer periphery of the outer convex surface contacts the spring, and during the downward movement of the upper mold block, the elastic part can be further guaranteed to be balanced in force and stable in deformation. Since the guide surface is slidably connected to the inner wall of the sleeve, the sliding stability of the guide rod is guaranteed.

[0015] Furthermore, a hollow guide structure is installed at one end of the sleeve away from the base, and the guide rod is installed in the guide structure and slidably connected to the guide structure; a portion of the guide structure located in the sleeve is formed with a limiting surface for contacting the support block.

[0016] According to the above technical means, since the guide rod is slidably connected to the guide structure, the guide rod can be made to operate more stably during the process of extending the sleeve or retracting the sleeve. Since the part of the guide structure located in the sleeve forms a limited position surface, when the elastic member pushes the support block to move upward, the limited position surface can contact the support block, thereby limiting the movement of the support block and the guide rod, and preventing the guide rod and the support block from detaching from the sleeve.

[0017] Furthermore, the material baffle plate assembly includes a material baffle plate and a connecting seat, wherein the connecting seat is connected to the material baffle plate along the length direction of the material baffle plate, and the connecting seat is connected to the telescopic end along the telescopic direction of the telescopic end.

[0018] According to the above technical means, since the material baffle plate is connectable to the connecting seat, and the connecting seat is connectable to the telescopic end, the connecting seat is connected to the material baffle plate and the telescopic end.

[0019] Furthermore, the connecting seat includes a bottom plate, a first waist hole is opened on the bottom plate along the length direction of the baffle plate, and the baffle plate is connected to the bottom plate through a first connecting member passing through the baffle plate and the first waist hole.

[0020] According to the above technical means, since the bottom plate is provided with a first waist hole, the first connecting member passes through the baffle plate and is connected to different positions of the first waist hole, so that the connection position between the bottom plate and the baffle plate can be adjusted along the length direction of the baffle plate.

[0021] Furthermore, the connecting seat also includes a first connecting block installed on the base plate, a second waist hole is opened on the first connecting block in the vertical direction, and a connecting hole is set at the telescopic end of the support assembly. The telescopic end is connected to the first connecting block through a second connecting member passing through the connecting hole and the second waist hole set in the first connecting block.

[0022] According to the above technical means, since a second waist hole is provided on the first connecting block and a connecting hole is provided on the telescopic end, the connecting hole is connected to different positions of the second waist hole through the second connecting member, so that the connection position of the first connecting block and the telescopic end can be adjusted in the vertical direction.

[0023] Furthermore, a second connecting block is provided on the telescopic end, the connecting hole is provided on the second connecting block, and the second connecting block is connected to the first connecting block by the second connecting member passing through the connecting hole and through a second waist hole provided on the first connecting block.

[0024] According to the above technical means, a second connecting block is provided on the telescopic end, and a connecting hole is provided on the second connecting block. The connecting hole is connected to different positions of the second waist hole through a second connecting member, so that the connection position of the first connecting block and the second connecting block can be adjusted in the vertical direction.

[0025] Beneficial effects of the utility model: In the utility model, the elastic material blocking mechanism of the buckling mold can limit the position of the door assembly parts, solving the problem that the positions of the door assembly parts will change disorderly after entering the working area of ​​the mold. The telescopic end of the support assembly can drive the material blocking plate assembly to descend under the force of the upper mold block, and after the force acting on the telescopic end of the support assembly disappears, the support assembly can drive the material blocking plate assembly to reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural schematic diagram of the elastic material retaining mechanism of the buckle mold of the utility model;

[0027] Figure 2 It is a cross-sectional structural diagram of the support assembly in the elastic material retaining mechanism of the buckle mold of the utility model;

[0028] Figure 3 It is a perspective view of the sleeve in the elastic material retaining mechanism of the buckle mold of the utility model;

[0029] Figure 4 It is a structural schematic diagram of the guide rod in the elastic material blocking mechanism of the buckle mold of the utility model;

[0030] Figure 5 It is a structural schematic diagram of the material blocking plate assembly in the elastic material blocking mechanism of the buckle mold of the utility model.

[0031] Among them: 1. base; 2. support assembly; 3. material baffle assembly; 21. fixed end; 22. telescopic end; 23. sleeve; 24. elastic member; 25. guide rod; 4. guide pin; 5. support block; 6. outer convex surface; 7. guide structure; 31. material baffle; 32. connecting seat; 321. bottom plate; 322. first connecting block; 8. first waist hole; 9. second waist hole; 10. second connecting block; 11. connecting hole; 12. groove; 13. guide surface; 14. limiting surface. DETAILED DESCRIPTION

[0032] The following will describe the implementation of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0033] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0034] like Figure 1As shown, a buckle mold elastic material stop mechanism includes a base 1, an elastically retractable support assembly 2 and a material stop plate assembly 3, wherein the fixed end 21 of the support assembly 2 and the retractable end 22 are elastically retractably connected, the fixed end 21 is mounted on the base 1, and the material stop plate assembly 3 is mounted on the retractable end 22. In this embodiment, when in use, a set of buckle mold elastic material stop mechanisms are respectively installed on both sides of the mold. When the stamping starts, the material stop plate assembly 3 is in a jacking state, and the material stop plate assembly 3 rises to limit the positions of the door assembly parts on both sides. At this time, the upper mold block moves downward, and the retractable end 22 of the support assembly 2 contracts after receiving the pressure of the upper mold block, and the retractable end 22 drives the material stop plate assembly 3 to descend during the contraction process. When the upper mold block moves to the dead point position, the retractable end 22 drives the material stop plate assembly 3 to move to the lowest position. When the upper mold block moves upward, due to the elastic retractable connection between the fixed end 21 and the retractable end 22, the retractable end 22 drives the material stop plate assembly 3 to move upward, completing a stamping action. The elastic material retaining mechanism of the snap-fit ​​mold can limit the position of the door assembly parts, solving the problem that the position of the door assembly parts will change disorderly after entering the working area of ​​the mold. Under the force of the upper mold block, the support component 2 can drive the material retaining plate component 3 to descend. After the force acting on the support component 2 disappears, the support component 2 can drive the material retaining plate component 3 to reset. It should be noted that the support component 2 is preferably installed vertically on the base 1, and the fixed end 21 of the support component 2 can be connected to the base 1 by welding. Other methods that can achieve the connection between the fixed end 21 and the base 1 are also within the protection scope of the present utility model. A mounting hole can be opened on the base 1, and a fastener can be installed in the mounting hole. The base 1 can be installed on one side of the mold through the fastener. It should also be pointed out that since the length of the material retaining plate component 3 is relatively long, in order to ensure the stable support of the support component 2 to the material retaining plate component 3, the material retaining plate component 3 on one side of the mold can be connected to two support components 2, and the telescopic ends 22 of the support components 2 are respectively connected to different positions of the material retaining plate component 3, and the fixed ends 21 of each support component 2 are respectively installed on the base 1.

[0035] In this embodiment, if Figures 2 to 4As shown, the support assembly 2 includes a sleeve 23, an elastic member 24 and a guide rod 25. The sleeve 23 is mounted on the base 1, the elastic member 24 is accommodated in the sleeve 23, one end of the guide rod 25 is accommodated in the sleeve 23 and in contact with the elastic member 24, and the other end of the guide rod 25 is exposed outside the sleeve 23 and connected to the baffle plate assembly 3; the fixed end 21 is formed at the end of the sleeve 23 connected to the base 1, and the telescopic end 22 is formed at the end of the guide rod 25 exposed outside the sleeve 23. It should be noted that the bottom end of the sleeve 23 is the end of the sleeve 23 connected to the base 1, and the top end of the guide rod 25 is the end of the guide rod 25 exposed in the sleeve 23. At the beginning of stamping, the baffle plate assembly 3 is in a jacking state, and the baffle plate assembly 3 is raised to limit the positions of the door assembly parts on both sides to avoid the problem of disorderly changes in the positions of the door assembly parts on both sides of the mold. At this time, the upper mold block moves downward, and the guide rod 25 is compressed into the sleeve 23 by the pressure of the upper mold block. The guide rod 25 drives the baffle plate assembly 3 downward during the contraction process. When the upper mold block moves to the dead point, the guide rod 25 drives the baffle plate assembly 3 to move to the lowest position, and the elastic member 24 is compressed to the maximum position. When the upper mold block moves upward, the elastic member 24 recovers its deformation, and the elastic member 24 pushes the guide rod 25 to drive the baffle plate assembly 3 to move upward, completing a stamping action.

[0036] In this embodiment, if Figure 2 , Figure 3 As shown, a guide pin 4 is installed in the sleeve 23, and the elastic member 24 is a spring, and the spring is sleeved on the guide pin 4. Since the guide pin 4 is installed at the bottom of the sleeve 23, the spring is sleeved on the guide pin 4, so that the deformation of the spring during compression can be ensured to be more stable. Specifically, during the compression and deformation of the spring, the compressed spring will still be sleeved on the guide pin 4. It should be noted that the spring sleeved on the guide pin 4 means that the spring is partially sleeved on the guide pin 4 when the spring is not compressed. It should also be pointed out that the guide pin 4 is installed on the inner bottom of the sleeve 23.

[0037] In this embodiment, if Figure 2 , Figure 4 As shown, the guide rod 25 is located at one end of the sleeve 23 and is connected to the support block 5, and the support block 5 is in contact with the upper end of the elastic member 24. During the downward movement of the upper mold block, the pressure of the upper mold block is transmitted to the support block 5 and the elastic member 24 through the guide rod 25. Due to the large contact area between the support block 5 and the elastic member 24, the elastic member 24 is more evenly stressed and the deformation of the elastic member 24 is also stable.

[0038] In this embodiment, if Figure 2 , Figure 4As shown, the support block 5 includes a guide surface 13 that can slide along the inner wall of the sleeve 23 and a groove 12 arranged on the longitudinal geometric center line of the support block 5. The bottom of the guide rod 25 is inserted into the groove 12, and the elastic member 24 is a spring. The convex surface 6 at the bottom of the groove 12 extends into the cavity where the inner diameter of the spring is located. Since the support block 5 is provided with a groove 12, one end of the guide rod 25 located in the sleeve 23 can be plugged into the groove 12, so that the connection between the guide rod 25 and the support block 5 can be achieved. Since the convex surface 6 extends into the cavity where the inner diameter of the spring is located, the peripheral part of the convex surface 6 can contact the spring, and in the process of the upper mold block moving downward, the force balance and deformation stability of the spring can be further guaranteed. Since the guide surface 13 is slidably connected with the inner wall surface of the sleeve 23, the sliding stability of the guide rod 25 is guaranteed.

[0039] In this embodiment, if Figure 3 As shown, a hollow guide structure 7 is installed at one end of the sleeve 23 away from the base 1, and the guide structure 7 is coaxially arranged with the sleeve 23. The guide rod 25 is installed in the guide structure 7 and is slidably connected with the guide structure 7; the part of the guide structure 7 located in the sleeve 23 is formed with a limit surface 14 for contacting the support block 5. Since the guide rod 25 is slidably connected with the guide structure 7, the guide rod 25 can be made to run more stably in the process of extending out of the sleeve 23 or retracting into the sleeve 23. It should be noted that the guide structure 7 can be a flanged linear bearing, which can be installed at the end of the sleeve 23 away from the base 1 through a screw structure. Since the part of the guide structure 7 located in the sleeve 23 forms a limited surface 14, in the process of the elastic member 24 pushing the support block 5 to move upward, the limit surface 14 can contact the support block 5, thereby limiting the movement of the support block 5 and the guide rod 25, and preventing the guide rod 25 and the support block 5 from being separated from the sleeve 23.

[0040] In this embodiment, if Figure 1 , Figure 5 As shown, the baffle plate assembly 3 includes a baffle plate 31 and a connecting seat 32, the connecting seat 32 is connected to the baffle plate 31 along the length direction of the baffle plate 31, and the connecting seat 32 is connected to the telescopic end 22 along the telescopic direction of the telescopic end 22. It should be noted that the baffle plate 31 and the connecting seat 32 are detachably connected, and the connecting seat 32 and the telescopic end 22 are detachably connected, so as to facilitate the installation and disassembly between the connecting seat 32 and the baffle plate 31 and the telescopic end 22.

[0041] In this embodiment, if Figure 5As shown, the connection seat 32 includes a bottom plate 321, and a first waist hole 8 is opened on the bottom plate 321 along the length direction of the baffle plate 31. The baffle plate 31 is connected to the bottom plate 321 through a first connecting member passing through the baffle plate 31 and the first waist hole 8. Since the first waist hole 8 is provided on the bottom plate 321, the first connecting member (not shown in the figure) passes through the baffle plate 31 and is connected to different positions of the first waist hole 8, so that the connection position between the bottom plate 321 and the baffle plate 31 can be adjusted along the length direction of the baffle plate 31. It should be noted that the first connecting member can be a bolt structure or other structures for achieving connection.

[0042] In this embodiment, the connection seat 32 also includes a first connection block 322 installed on the bottom plate 321, and a second waist hole 9 is opened on the first connection block 322 in the vertical direction. The telescopic end 22 of the support assembly 2 is provided with a connection hole, and the telescopic end 22 is connected to the first connection block 322 through a second connection member (not shown in the figure) passing through the connection hole 11 and the second waist hole 9 provided on the first connection block 322. Since the second waist hole 9 is provided on the first connection block 322 and the telescopic end 22 is provided with a connection hole, the connection hole is connected to different positions of the second waist hole 9 through the second connection member, so that the connection position of the first connection block 322 and the telescopic end 22 can be adjusted in the vertical direction. It should be noted that the second connection member can be a bolt structure or other structure for achieving connection.

[0043] In this embodiment, the telescopic end 22 is provided with a second connection block 10, the connection hole 11 is provided on the second connection block 10, and the second connection block 10 is connected to the first connection block 322 through the second connection member passing through the connection hole 11 and the second waist hole 9 provided on the first connection block 322. The telescopic end 22 is provided with a second connection block 10, the connection hole 11 is provided on the second connection block 10, and the connection hole 11 is connected to different positions of the second waist hole 9 through the second connection member, so that the connection position of the first connection block 322 and the second connection block 10 can be adjusted in the vertical direction. It should be noted that the second connection block 10 can be installed on the telescopic end 22 by screws, the connection hole 11 is provided on the second connection block 10, and the second waist hole 9 is connected to the connection hole 11 through the second connection member to achieve indirect connection between the first connection block 322 and the telescopic end 22.

[0044] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A buckle mold elastic material stop mechanism, characterized in that: The invention comprises a base (1), an elastically retractable support component (2) and a material baffle component (3); the support component (2) comprises a fixed end (21) and a retractable end (22); the fixed end (21) is elastically retractably connected to the retractable end (22); the fixed end (21) is mounted on the base (1), and the material baffle component (3) is mounted on the retractable end (22).

2. The elastic material stop mechanism of the snap-fit ​​mold according to claim 1, characterized in that: The support assembly (2) comprises a sleeve (23), an elastic member (24) and a guide rod (25); the sleeve (23) is mounted on the base (1); the elastic member (24) is accommodated in the sleeve (23); one end of the guide rod (25) is accommodated in the sleeve (23) and in contact with the elastic member (24); the other end of the guide rod (25) is exposed outside the sleeve (23) and connected to the baffle plate assembly (3); the fixed end (21) is formed at the end of the sleeve (23) connected to the base (1); the telescopic end (22) is formed at the end of the guide rod (25) exposed outside the sleeve (23).

3. The elastic material stop mechanism of the snap-fit ​​mold according to claim 2, characterized in that: A guide pin (4) is installed in the sleeve (23); the elastic member (24) is a spring, and the spring is sleeved on the guide pin (4).

4. The elastic material retaining mechanism of the snap-fit ​​mold according to claim 2, characterized in that: One end of the guide rod (25) located in the sleeve (23) is connected to a support block (5), and the support block (5) is in contact with the upper end of the elastic member (24).

5. The elastic material retaining mechanism of the snap-fit ​​mold according to claim 4, characterized in that: The support block (5) comprises a guide surface (13) capable of sliding along the inner wall of the sleeve (23) and a groove (12) arranged on the longitudinal geometric center line of the support block (5); the bottom of the guide rod (25) is inserted into the groove (12); the elastic member (24) is a spring; the outer convex surface (6) at the bottom of the groove (12) extends into the cavity where the inner diameter of the spring is located.

6. The elastic material retaining mechanism of the snap-fit ​​mold according to claim 4, characterized in that: A hollow guide structure (7) is installed at one end of the sleeve (23) away from the base (1); the guide rod (25) is installed in the guide structure (7) and is slidably connected to the guide structure (7); a portion of the guide structure (7) located in the sleeve (23) is formed with a limiting surface (14) for contacting the support block (5).

7. The elastic material retaining mechanism of the snap-fit ​​mold according to any one of claims 1 to 6, characterized in that: The material baffle plate assembly (3) comprises a material baffle plate (31) and a connecting seat (32); the connecting seat (32) is connected to the material baffle plate (31) along the length direction of the material baffle plate (31); and the connecting seat (32) is connected to the telescopic end (22) along the telescopic direction of the telescopic end (22).

8. The elastic material retaining mechanism of the snap-fit ​​mold according to claim 7, characterized in that: The connecting seat (32) comprises a bottom plate (321), a first waist hole (8) is provided on the bottom plate (321) along the length direction of the baffle plate (31), and the baffle plate (31) is connected to the bottom plate (321) via a first connecting member passing through the baffle plate (31) and the first waist hole (8).

9. The elastic material retaining mechanism of the snap-fit ​​mold according to claim 8, characterized in that: The connecting seat (32) further comprises a first connecting block (322) mounted on the bottom plate (321), a second waist hole (9) being provided on the first connecting block (322) in a vertical direction, a connecting hole (11) being provided at the telescopic end (22) of the supporting assembly (2), and the telescopic end (22) is connected to the first connecting block (322) via a second connecting member passing through the connecting hole (11) and the second waist hole (9) provided on the first connecting block (322).

10. The elastic material stop mechanism of the snap-fit ​​mold according to claim 9, characterized in that: A second connecting block (10) is provided on the telescopic end (22), the connecting hole (11) is provided on the second connecting block (10), and the second connecting block (10) is connected to the first connecting block (322) by the second connecting member passing through the connecting hole (11) and through a second waist hole (9) provided on the first connecting block (322).

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