Accurate limiting device for automatic thread retreating of mold

Abstract

The utility model relates to the technical field of precise limiting devices, in particular to a precise limiting device for automatic thread retreating of a mold, which comprises a mold bottom plate, the top of the mold bottom plate is connected with a plurality of groups of tooth shaft sleeves in a clamping manner through a locking mechanism, a tooth shaft main body is mounted on each tooth shaft sleeve, and a first rubber pad is mounted at the bottom end of each tooth shaft sleeve in an embedded manner; the locking mechanism comprises a connecting assembly and a clamping assembly, the connecting assembly is used for preliminarily connecting and placing the tooth shaft sleeve and the tooth shaft body on the mold bottom plate, and the clamping assembly is used for locking or unlocking the position relation between the tooth shaft sleeve and the mold bottom plate and between the tooth shaft body and the mold bottom plate. The connecting assembly comprises two butt joint blocks installed at the two ends of the top of the mold bottom plate, and a first inclined face is arranged at the top end of one side of each butt joint block. The device is simple in structure and convenient to operate, workers do not need to rotate all sets of fixing bolts and bolts circle by circle and extrude pins, and the overhauling, dismounting and replacing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of precise limiting devices, and particularly relates to a precise limiting device for automatic thread retraction of a mold. Background Technique

[0002] It is well-known that the limiting block of the current automatic thread retraction mechanism is generally fixed on the tooth shaft through a cylinder. When the product has completed automatic thread retraction and is reset, the limiting block abuts against the moving template. Due to the inertia of the transmission system, whether the transmission system uses an oil cylinder or a motor, there is a clearance fit between the tooth shaft and the tooth sleeve at one end of the tooth shaft, and the tooth shaft will still move forward a certain distance. Although this distance is very small, it will also cause a large error in the rotated angle, resulting in an inaccurate starting position of the product tooth and a decrease in product accuracy. For products with the following two types of threads, there are also the following disadvantages: 1. For products with a notch in the thread that require a sliding block to be withdrawn: To withdraw the sliding block, due to a large angle error, it directly causes the sliding block to be unable to align with the tooth shaft when reset, easily damaging the tooth shaft, and the mold has no mass production property; 2. For products with strict requirements for the starting position of the thread tooth: Not only can the accuracy of the starting position of the product thread tooth not be guaranteed at all, especially when the pitch of the product is relatively small, the accuracy of the starting position of the thread tooth is even more impossible to guarantee. For the case product: When the pitch is 1 mm and the diameter D of the tooth shaft is 25 mm, when the tooth shaft rotates one circle, that is, the tooth shaft moves 1 mm. If the tooth shaft moves a small distance of 0.02 upward due to the inertia of the transmission system and the thread transmission gap between the tooth shaft and the tooth sleeve, the calculated angle of the tooth sleeve rotating more is 360 degrees / (1 / 0.02) = 18 degrees. This error directly causes the sliding block to be unable to align with the groove on the tooth shaft, directly damaging the tooth sleeve and the sliding block, and also causing the starting position of the product tooth in the next molding to differ from the previous one by 18 degrees, seriously affecting the accuracy of the starting position of the product tooth.

[0003] In order to solve the above technical problems, the Chinese patent with the publication number CN205522272U in the prior art discloses a precise limiting device for automatic thread retraction of a mold, including a tooth shaft, an angle positioning disk, a positioning block, and a tooth sleeve. A tooth sleeve is fixed at the lower end of the tooth shaft, and a convex platform is provided in the middle of the tooth shaft.

[0004] Although the above prior art solution ensures the precise molding of the starting position of the thread tooth profile of the product, when the main components of the tooth shaft need to be separated for maintenance or replacement, the staff still needs to turn each group of fixing bolts and bolts one by one and extrude the pins. The disassembly, maintenance, and assembly are relatively cumbersome, affecting the efficiency of maintenance, disassembly, and replacement. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a precise limiting device for automatic thread retraction of a mold to solve the problems raised in the above background technique.

[0006] To achieve the above object, the utility model provides the following technical solutions:

[0007] A precise limiting device for automatic thread withdrawal of a mold, comprising a mold bottom plate. A plurality of tooth shaft sleeves are snap-connected to the top of the mold bottom plate through a locking mechanism. A tooth shaft main body is installed on the tooth shaft sleeve. A first rubber pad is embedded at the bottom end of the tooth shaft sleeve. The locking mechanism includes a connecting component and a clamping component. The connecting component is used to initially connect and place the tooth shaft sleeve together with the tooth shaft main body on the mold bottom plate. The clamping component is used to lock or unlock the positional relationship between the tooth shaft sleeve and the tooth shaft main body and the mold bottom plate.

[0008] As a preferred solution of the utility model, the connecting component includes two docking blocks installed at both ends of the top of the mold bottom plate. A first inclined surface is provided at the top end of one side of the docking block. A second inclined surface is provided at one end of the first inclined surface on one side of the docking block. Docking grooves are provided at both ends of the bottom of the first rubber pad. The docking grooves are snap-connected to the docking blocks.

[0009] As a preferred solution of the utility model, the clamping component includes an installation groove provided inside the tooth shaft sleeve on one side of the docking groove. A first movable rod is rotatably connected to one end of the inner side of the installation groove. A spring pressing block is installed on the outer side of the first movable rod. A third inclined surface is provided at the bottom end of one side of the spring pressing block. A fourth inclined surface is provided at one end of the third inclined surface on one side of the spring pressing block. A fixing groove is provided inside the spring pressing block above the fourth inclined surface. A fixing rod is rotatably connected to the inner side of the fixing groove. A fixing spring is installed on the outer side of the fixing rod. The other end of the fixing spring is fixedly connected to the inner wall of the installation groove. An operation groove is provided on one side of the bottom end of the tooth shaft sleeve. A pull ring is installed at one end of the first movable rod extending into the inner side of the operation groove. A hanging post is installed on the inner wall of the operation groove.

[0010] As a preferred solution of the utility model, a retraction groove is provided at the fourth inclined surface inside the spring pressing block. A retraction rod is rotatably connected to the inner side of the retraction groove. A retraction plate is installed on the outer side of the retraction rod. A fifth inclined surface is provided on one side of the retraction plate. A torsion spring is installed at one end of the retraction rod. A positioning groove is provided at the second inclined surface on the outer wall of the docking block.

[0011] As a preferred solution of the utility model, a limiting plate is installed at the other end of the spring pressing block. A limiting groove for sliding connection with the limiting plate is provided on the inner wall of the installation groove.

[0012] As a preferred solution of the present utility model, a positioning block is clamped on the tooth shaft main body through a positioning component, an angle positioning disk is installed at the top end of the positioning block, the positioning component includes a socket groove opened on one side of the tooth shaft main body, a socket plate is slidably connected inside the socket groove, two groups of socket springs are arranged and installed between the two ends of one side of the socket plate and the inner wall of the socket groove, a socket column is installed on the other side of the socket plate, and a socket hole engaged with the socket column is opened on one side of the tooth shaft main body.

[0013] As a preferred solution of the present utility model, a pull rod slidably connected with the positioning block is installed on one side of the socket plate, and a buckle ring is rotatably connected to the end of the pull rod extending outside the positioning block.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] In the present utility model, the tooth shaft sleeve together with the tooth shaft main body is initially connected and placed on the mold bottom plate through the connection component, and the clamping component locks or unlocks the positional relationship between the tooth shaft sleeve and the tooth shaft main body and the mold bottom plate. The structure is simple and the operation is convenient. There is no need for the staff to rotate each group of fixing bolts and bolts one by one and extrude the pins, which improves the efficiency of maintenance, disassembly and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0017] Figure 2 is a schematic diagram of the partial sectional structure of the locking mechanism of the present utility model;

[0018] Figure 3 is the present utility model Figure 1 partial enlarged structure schematic diagram of part A;

[0019] Figure 4 is a schematic diagram of the socket assembly structure of the present utility model.

[0020] In the figure: 1, mold bottom plate; 2, tooth shaft sleeve; 3, tooth shaft main body; 4, first rubber pad; 5, first inclined surface; 6, second inclined surface; 7, docking block; 8, first movable rod; 9, spring pressing block; 10, third inclined surface; 11, fourth inclined surface; 12, fixed rod; 13, fixed spring; 14, retraction rod; 15, retraction plate; 16, fifth inclined surface; 17, torsion spring; 18, limiting plate; 19, positioning block; 20, angle positioning disk; 21, socket plate; 22, socket spring; 23, socket column; 24, pull rod; 25, pull ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Embodiment:

[0023] Please refer to Figures 1 - 4 , the present utility model provides a technical solution:

[0024] A precise limit device for automatic thread withdrawal of a mold, including a mold bottom plate 1. At the top of the mold bottom plate 1, a plurality of sets of tooth shaft sleeves 2 are snap-connected through a locking mechanism. A tooth shaft main body 3 is installed on the tooth shaft sleeve 2. A first rubber pad 4 is embedded at the bottom end of the tooth shaft sleeve 2. The locking mechanism includes a connection component and a clamping component. The connection component is used to initially connect and place the tooth shaft sleeve 2 together with the tooth shaft main body 3 on the mold bottom plate 1. The clamping component is used to lock or unlock the positional relationship between the tooth shaft sleeve 2 and the tooth shaft main body 3 and the mold bottom plate 1. When the device is in use, the connection component can be used to initially connect and place the tooth shaft sleeve 2 together with the tooth shaft main body 3 on the mold bottom plate 1, and the clamping component locks or unlocks the positional relationship between the tooth shaft sleeve 2 and the tooth shaft main body 3 and the mold bottom plate 1. The structure is simple and the operation is convenient. There is no need for the staff to rotate each set of fixing bolts and bolts one by one and extrude the pins, which improves the efficiency of maintenance, disassembly and replacement.

[0025] In this embodiment, as Figure 1 , Figure 2 and Figure 3 shown, the connection component includes two docking blocks 7 installed at both ends of the top of the mold bottom plate 1. At the top end of one side of the docking block 7, a first inclined surface 5 is provided. At one end of the first inclined surface 5 on one side of the docking block 7, a second inclined surface 6 is provided. Docking grooves are provided at both ends of the bottom of the first rubber pad 4, and the docking grooves are snap-connected with the docking blocks 7. First, align the two docking blocks 7 and snap them into the docking grooves so that the partial opposite ends of the docking blocks 7 and the elastic pressing blocks 9 are in contact, completing the initial connection and placement of the mold bottom plate 1 and the tooth shaft main body 3.

[0026] In this embodiment, as Figure 1 , Figure 2 and Figure 3As shown, the clamping assembly includes an installation groove opened inside the tooth shaft sleeve 2 on one side of the docking groove. One end of the inner side of the installation groove is rotatably connected to a first movable rod 8. A spring pressing block 9 is installed on the outer side of the first movable rod 8. A third inclined surface 10 is opened at the bottom end of one side of the spring pressing block 9. A fourth inclined surface 11 is opened at one end of the third inclined surface 10 on one side of the spring pressing block 9. A fixing groove is opened inside the spring pressing block 9 above the fourth inclined surface 11. A fixing rod 12 is rotatably connected to the inner side of the fixing groove. A fixing spring 13 is installed on the outer side of the fixing rod 12. The other end of the fixing spring 13 is fixedly connected to the inner wall of the installation groove. An operation groove is opened at one side of the bottom end of the tooth shaft sleeve 2. One end of the first movable rod 8 extending to the inner side of the operation groove is installed with a pull ring 25. A hanging post is installed on the inner wall of the operation groove. A retraction groove is opened at the fourth inclined surface 11 inside the spring pressing block 9. A retraction rod 14 is rotatably connected to the inner side of the retraction groove. A retraction plate 15 is installed on the outer side of the retraction rod 14. A fifth inclined surface 16 is opened at one side of the retraction plate 15. A torsion spring 17 is installed at one end of the retraction rod 14. A positioning groove is opened at the second inclined surface 6 on the outer wall of the docking block 7. A limiting plate 18 is installed at the other end of the spring pressing block 9. A limiting groove slidably connected to the limiting plate 18 is opened on the inner wall of the installation groove. Then, continue to press downwards, so that the first inclined surface 5 and the second inclined surface 6 are in contact with the third inclined surface 10 and the fourth inclined surface 11, so that the spring pressing block 9 cooperates with the limiting plate 18 and the limiting groove to unfold around the first movable rod 8, and at the same time the fixing spring 13 is also stretched. Continue to press the docking block 7, and the second inclined surface 6 and the first inclined surface 5 press the fifth inclined surface 16 on the retraction plate 15, forcing it to retract into the inner side of the retraction groove. When it is aligned with the positioning groove, the torsion spring 17 rebounds to drive the retraction plate 15 to unfold inside the positioning groove. At this time, the first rubber pad 4 is in a compressed state. Then release the tooth shaft body 3, and the first rubber pad 4 rebounds a certain distance and the retraction plate 15 abuts against the inner wall of the positioning groove, and the fixing of the tooth shaft body 3 can be completed. When disassembling, rotate the pull ring 25 to drive the first movable rod 8 to rotate, so that the spring pressing block 9 actively stretches the fixing spring 13, and the retraction plate 15 can be disengaged from the positioning groove and temporarily hung on the hanging post. At this time, the tooth shaft body 3 can be removed to complete the disassembly for maintenance and replacement.

[0027] In this embodiment, as Figure 1 and Figure 4As shown, a positioning block 19 is snap-connected to the tooth shaft main body 3 through a positioning component. An angle positioning disc 20 is installed at the top of the positioning block 19. The positioning component includes a socket groove opened on one side of the tooth shaft main body 3. A socket plate 21 is slidably connected to the inner side of the socket groove. Two groups of socket springs 22 are arranged and installed between the two ends of one side of the socket plate 21 and the inner wall of the socket groove. A socket column 23 is installed on the other side of the socket plate 21. A socket hole that is snap-connected to the socket column 23 is opened on one side of the tooth shaft main body 3. A pull rod 24 that is slidably connected to the positioning block 19 is installed on one side of the socket plate 21. One end of the pull rod 24 extending outside the positioning block 19 is rotatably connected to a snap ring. Further, by holding the snap ring and driving the pull rod 24 to move, the socket plate 21 slides inside the socket groove, squeezing the socket spring 22 to retract, so that the socket column 23 disengages from the inside of the socket groove. Then, the positioning block 19 together with the angle positioning disc 20 can be removed for maintenance and replacement.

[0028] The implementation principle of the precise limit device for automatic thread withdrawal of a mold in an embodiment of the present application is as follows: Align the two docking blocks 7 and snap them into the docking grooves, so that partial opposite ends of the docking blocks 7 and the elastic pressing blocks 9 are in contact, completing the preliminary connection and placement of the mold bottom plate 1 and the tooth shaft main body 3. Continue to press downwards, so that the first inclined surface 5 and the second inclined surface 6 are in contact with the third inclined surface 10 and the fourth inclined surface 11, causing the elastic pressing block 9 to unfold around the first movable rod 8 in cooperation with the limiting plate 18 and the limiting groove. At the same time, the fixing spring 13 is also stretched. Continue to press the docking block 7, and the second inclined surface 6 and the first inclined surface 5 press the fifth inclined surface 16 on the retracting plate 15, forcing it to retract into the inside of the retracting groove. After it aligns with the positioning groove, the torsion spring 17 rebounds to drive the retracting plate 15 to unfold inside the positioning groove. At this time, the first rubber pad 4 is in a compressed state. Then, release the tooth shaft main body 3, and the first rubber pad 4 rebounds a certain distance and the retracting plate 15 abuts against the inner wall of the positioning groove, thus completing the fixation of the tooth shaft main body 3. During disassembly, rotate the pull ring 25 to drive the first movable rod 8 to rotate. After temporarily hanging on the hanging post, let the elastic pressing block 9 actively stretch the fixing spring 13, and the retracting plate 15 can disengage from the positioning groove. At this time, the tooth shaft main body 3 can be removed to complete the disassembly for maintenance and replacement. By holding the snap ring and driving the pull rod 24 to move, the socket plate 21 slides inside the socket groove, squeezing the socket spring 22 to retract, so that the socket column 23 disengages from the inside of the socket groove. Then, the positioning block 19 together with the angle positioning disc 20 can be removed for maintenance and replacement.

[0029] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A precise limiting device for automatic thread withdrawal of a mold, comprising a mold bottom plate (1), characterized in that: The top of the mold base plate (1) is connected to a plurality of groups of tooth shaft sleeves (2) through a locking mechanism, a tooth shaft body (3) is installed on the tooth shaft sleeve (2), and a first rubber pad (4) is embedded and installed at the bottom end of the tooth shaft sleeve (2), and the locking mechanism comprises a connecting component and a clamping component, the connecting component is used to initially connect the tooth shaft sleeve (2) and the tooth shaft body (3) and place them on the mold base plate (1), and the clamping component is used to lock or unlock the positional relationship between the tooth shaft sleeve (2) and the tooth shaft body (3) and the mold base plate (1).

2. According to claim 1, a precise limit device for automatic thread withdrawal of a mold, characterized in that: The connection assembly comprises two groups of docking blocks (7) mounted at the two ends of the top of the mold bottom plate (1); a first inclined surface (5) is provided at the top of one side of the docking block (7); a second inclined surface (6) is provided at one end of the first inclined surface (5) on one side of the docking block (7); docking grooves are provided at both ends of the bottom of the first rubber pad (4); and the docking grooves are connected to the docking block (7) by snap-fitting.

3. According to claim 2, a precise limit device for automatic thread withdrawal of a mold, characterized in that: The clamping assembly comprises an installation groove provided inside the tooth shaft sleeve (2) and located on one side of the docking groove, a first movable rod (8) is rotatably connected to one end of the inner side of the installation groove, a spring block (9) is installed on the outer side of the first movable rod (8), a third inclined surface (10) is provided at the bottom end of one side of the spring block (9), a fourth inclined surface (11) is provided at one end of one side of the spring block (9) and located above the fourth inclined surface (11), a fixing groove is provided inside the spring block (9) and rotatably connected to the inner side of the fixing groove, a fixing spring (13) is installed on the outer side of the fixing rod (12), the other end of the fixing spring (13) is fixedly connected to the inner wall of the installation groove, an operating groove is provided on one side of the bottom end of the tooth shaft sleeve (2), a pull ring (25) is installed at one end of the first movable rod (8) extending to the inner side of the operating groove, and a hanging column is installed on the inner wall of the operating groove.

4. According to claim 3, a precise limit device for automatic thread withdrawal of a mold is characterized by: A retraction groove is provided inside the elastic pressure block (9) at the fourth inclined surface (11), a retraction rod (14) is rotatably connected to the inner side of the retraction groove, a retraction plate (15) is installed on the outer side of the retraction rod (14), a fifth inclined surface (16) is provided on one side of the retraction plate (15), a torsion spring (17) is installed on one end of the retraction rod (14), and a positioning groove is provided on the outer wall of the docking block (7) at the second inclined surface (6).

5. According to claim 4, a precise limit device for automatic thread withdrawal of a mold is characterized by: A limiting plate (18) is installed at the other end of the elastic pressure block (9), and a limiting groove slidably connected to the limiting plate (18) is provided on the inner wall of the installation groove.

6. The precise limit device for automatic thread withdrawal of a mold according to claim 5, characterized in that: A positioning block (19) is clamped on the tooth axis body (3) through a positioning assembly, and an angle positioning plate (20) is installed on the top of the positioning block (19). The positioning assembly comprises a sleeve groove opened on one side of the tooth axis body (3), and a sleeve plate (21) is slidably connected to the inner side of the sleeve groove. Two groups of sleeve springs (22) are arranged and installed between the two ends of one side of the sleeve plate (21) and the inner wall of the sleeve groove. A sleeve column (23) is installed on the other side of the sleeve plate (21), and a sleeve hole is opened on one side of the tooth axis body (3) and is clamped and connected to the sleeve column (23).

7. The precise limit device for automatic thread withdrawal of a mold according to claim 6, characterized in that: A pull rod (24) slidably connected to the positioning block (19) is installed on one side of the sleeve plate (21); one end of the pull rod (24) extending to the outside of the positioning block (19) is rotatably connected to a buckle.

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