Cross top lock

Abstract

The utility model provides a cross-shaped top lock which comprises a locking block, and the upper face and the lower face of the locking block are a locking face and a reference face respectively. The locking surface is provided with a positioning groove which is formed from left to right and is lower than the locking surface and a positioning tenon which is formed from front to back and is higher than the locking surface; the axis of the positioning groove and the axis of the positioning tenon are arranged in a crossed mode when projected to the locking face or the reference face. The locking block is further provided with a mounting hole penetrating through the locking face and the reference face, and the center of the mounting hole coincides with the axis of the positioning groove and the axis of the positioning tenon which are arranged in a crossed mode. The number of the locking blocks is two, and the locking faces of the two locking blocks are buckled with each other so that the positioning groove and the positioning tenon of one locking block can be matched with the positioning tenon and the positioning groove of the other locking block in a concave-convex mode respectively. The four-direction freedom degree limiting mechanism has the advantages of being compact in structure and capable of achieving four-direction freedom degree limiting.

Description

Technical Field

[0001] The utility model relates to the field of mold accessories, in particular to a cross top lock. Background Art

[0002] The main function of the mold top lock is to fix and prevent the mold center from deviating. It is an important part in mold design. Its main functions include:

[0003] Fixing function: The mold top lock can fix the mold core in the mold through its design, preventing the mold core from shifting during processing or use; if the mold core shifts, it may cause quality problems such as burrs on the product.

[0004] Improved precision: Ultra-thin top locks not only reduce processing costs by reducing thickness and simplifying the appearance design, but also provide designers with more usage space and design flexibility; at the same time, its one-time processing characteristics improve the precision of the mold and reduce the need for secondary clamping and processing.

[0005] Save space and time: Compared with traditional side locks, the ultra-thin top lock takes up less space, which makes it possible to install and use it in small and medium-sized molds with more intensive processing; in addition, it also saves processing time and improves work efficiency.

[0006] Easy to install and process: The mold top lock is designed with a square positioning block (side lock), which is installed on the side surface of the mold, making it easy to load and unload, and the mounting holes (grooves) on the template are easy to process, further simplifying the installation and maintenance process of the mold.

[0007] In summary, the mold top lock not only improves the precision and efficiency of the mold, but also reduces the cost through its design and function. It is an indispensable and important component in mold design.

[0008] However, the current top locks can only constrain the freedom of the mold in two directions, that is, the cooperation between a single groove and a slider. Therefore, multiple sets of top locks are needed to limit the freedom in four directions on the two-dimensional plane, which means that enough mounting holes need to be processed in the mold to fix the top locks during installation and processing. At the same time, the more top locks there are, the more difficult it is to adjust the cooperation between them. Utility Model Content

[0009] Based on the above problems, the utility model aims to provide a cross top lock with a compact structure and capable of achieving four-way freedom restriction.

[0010] In view of the above problems, the following technical solutions are provided: a cross top lock, comprising a locking block, wherein the upper and lower surfaces of the locking block are respectively a locking surface and a reference surface; the locking surface is provided with a positioning groove opened from left to right and lower than the locking surface, and a positioning convex falcon opened from front to back and higher than the locking surface; the opening axis of the positioning groove and the opening axis of the positioning convex falcon are cross-arranged when projected onto the locking surface or the reference surface; the locking block is also provided with a mounting hole opened through the locking surface and the reference surface, and the center of the mounting hole coincides with the opening axis of the positioning groove and the opening axis of the positioning convex falcon arranged crosswise; the locking block consists of two pieces, and the locking surfaces of the two pieces are buckled with each other so that the positioning groove and the positioning convex falcon of one locking block are respectively matched with the positioning convex falcon and the positioning groove of the other locking block.

[0011] In the above structure, the reference surface serves as the installation surface and contacts the mold; by arranging a positioning groove and a positioning cam on the locking surface of the same locking block and making the two cross each other, when the two locking blocks are engaged with each other, the four degrees of freedom on the two-dimensional plane can be constrained and locked at the same time. Compared with the existing top lock structure, it is simpler and more convenient to install, which ensures accuracy while greatly simplifying the installation process.

[0012] The utility model is further configured such that the depth of the positioning groove is greater than the height of the positioning protrusion.

[0013] In the above structure, the positioning projection is prevented from abutting against the positioning groove, so that the locking surfaces of the two locking blocks cannot contact each other.

[0014] The utility model is further configured that a countersunk hole with an inner diameter larger than that of the mounting hole is provided at the opening of one end of the mounting hole facing the locking surface.

[0015] In the above structure, the countersunk hole is used to accommodate the screw head of the mounting bolt.

[0016] The utility model is further configured to include a mounting bolt, which includes a screw rod arranged through the mounting hole and a screw head connected to the screw rod and located in the countersunk hole, and the height from the top surface of the screw head to the bottom of the countersunk hole is less than the distance from the bottom of the countersunk hole to the locking surface.

[0017] In the above structure, the height from the screw head to the bottom of the countersunk hole is smaller than the distance from the bottom of the countersunk hole to the locking surface, which can avoid the situation where the screw heads of the two mounting bolts abut against each other when the two locking blocks are buckled, causing the locking surfaces of the two locking blocks to be unable to contact each other.

[0018] The utility model is further configured that the screw head is a hexagonal screw head.

[0019] In the above structure, the screw head is preferably a hexagonal screw head, which has the advantage of small size.

[0020] The utility model is further configured such that when the positioning grooves of the two locking blocks are matched with the positioning cams, the side walls of the positioning grooves and the side walls of the positioning cams are in transitional fit or clearance fit.

[0021] In the above structure, the side wall of the positioning groove and the side wall of the positioning projection are preferably clearance-fitted.

[0022] The utility model is further configured that the junction between the side wall of the positioning groove and the locking surface is transitioned through a first chamfer / rounding; the junction between the top surface of the positioning projection and the side wall is transitioned through a second chamfer / rounding.

[0023] The above structure is helpful to guide the positioning groove and the positioning projection to align and engage with each other.

[0024] The utility model is further configured that the junction between the side wall of the positioning groove and the groove bottom is transitioned through a third chamfer / rounding; the junction between the side wall of the positioning projection and the locking surface is transitioned through a fourth chamfer / rounding.

[0025] In the above structure, stress concentration can be effectively reduced.

[0026] The utility model is further configured that the junction between the top surface of the positioning convex falcon and the outer side wall of the locking block is transitioned through a fifth chamfer / rounding.

[0027] In the above structure, since the junction between the top surface of the positioning cam and the outer side wall of the locking block is prone to bumps and scratches, providing a fifth chamfer / rounded transition can effectively improve durability.

[0028] The utility model is further configured that the junction between the reference surface and the outer side wall of the locking block is transitioned through a sixth chamfer / rounding.

[0029] In the above structure, deformation caused by collision due to right-angle docking can be avoided to affect the installation accuracy of the reference surface.

[0030] The beneficial effects of the utility model are as follows: the reference surface is used as the installation surface to contact the mold; by arranging the positioning groove and the positioning cam on the locking surface of the same locking block, and making the two present a cross, when the two locking blocks are buckled with each other, the four degrees of freedom on the two-dimensional plane can be constrained and locked at the same time. Compared with the existing top lock structure, it is simpler and more convenient to install, and the installation process is greatly simplified while ensuring accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a three-dimensional structural schematic diagram of the utility model in which two locking blocks are locked together.

[0032] Figure 2 It is a schematic diagram of the three-dimensional structure of the two locking blocks of the utility model in the separated state.

[0033] Figure 3It is a schematic diagram of the structure of the two locking blocks of the utility model in the explosion state.

[0034] Figure 4 For this utility model Figure 1 Schematic diagram of the full cross-section structure.

[0035] Figure 5 For this utility model Figure 2 Schematic diagram of the full cross-section structure.

[0036] Meaning of the numbers in the figure: 10-locking block; 101-fifth chamfer / rounding; 102-sixth chamfer / rounding transition; 11-locking surface; 12-reference surface; 13-positioning groove; 14-positioning cam; 15-mounting hole; 151-countersunk hole; 16-first chamfer / rounding; 17-second chamfer / rounding; 18-third chamfer / rounding; 19-fourth chamfer / rounding; 20-mounting bolt; 21-screw; 22-screw head. DETAILED DESCRIPTION

[0037] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0038] refer to Figures 1 to 5 ,like Figures 1 to 5 A cross top lock shown in the figure comprises a locking block 10, wherein the upper and lower surfaces of the locking block 10 are respectively a locking surface 11 and a reference surface 12; the locking surface 11 is provided with a positioning groove 13 which is provided from left to right and lower than the locking surface 11, and a positioning convex falcon 14 which is provided from front to back and higher than the locking surface 11; the opening axis of the positioning groove 13 and the opening axis of the positioning convex falcon 14 are arranged crosswise when projected onto the locking surface 11 or the reference surface 12; the locking block 10 is also provided with a mounting hole 15 which passes through the locking surface 11 and the reference surface 12, and the center of the mounting hole 15 coincides with the opening axis of the positioning groove 13 and the opening axis of the positioning convex falcon 14 which are arranged crosswise; the locking block 10 is composed of two pieces, and the locking surfaces 11 of the two pieces are buckled with each other so that the positioning groove 13 and the positioning convex falcon 14 of one locking block 10 are respectively matched with the positioning convex falcon 14 and the positioning groove 13 of the other locking block 10.

[0039] In the above structure, the reference surface 12 serves as the installation surface and contacts the mold; by providing a positioning groove 13 and a positioning cam 14 on the locking surface 11 of the same locking block 10, and making the two cross each other, when the two locking blocks 10 are engaged with each other, the four degrees of freedom on the two-dimensional plane can be constrained and locked at the same time. Compared with the existing top lock structure, it is simpler and more convenient to install, which ensures accuracy while greatly simplifying the installation process.

[0040] In this embodiment, the depth T1 of the positioning groove 13 is greater than the height L1 of the positioning protrusion 14 .

[0041] In the above structure, the positioning protrusion 14 is prevented from abutting against the positioning groove 13 so that the locking surfaces 11 of the two locking blocks 10 cannot contact each other.

[0042] In this embodiment, a countersunk hole 151 having an inner diameter larger than that of the mounting hole 15 is provided at the opening of the mounting hole 15 at one end of the mounting hole 15 facing the locking surface 11 .

[0043] In the above structure, the counterbore 151 is used to accommodate the screw head 22 of the mounting bolt 20 .

[0044] In this embodiment, a mounting bolt 20 is also included, and the mounting bolt 20 includes a screw rod 21 set through the mounting hole 15 and a screw head 22 connected to the screw rod 21 and located in the countersunk hole 151. The height L2 from the top surface of the screw head 22 to the bottom of the countersunk hole 151 is less than the distance L3 between the bottom of the countersunk hole 151 and the locking surface 11.

[0045] In the above structure, the height L2 from the screw head 22 to the bottom of the counterbore 151 is less than the distance L3 from the bottom of the counterbore 151 to the locking surface 11, which can avoid the situation where the screw heads 22 of the two mounting bolts 20 abut against each other when the two locking blocks 10 are engaged, causing the locking surfaces 11 of the two locking blocks 10 to be unable to contact each other (the threads of the screw 21 are not shown in the figure).

[0046] In this embodiment, the screw head 22 is a hexagonal screw head 22 .

[0047] In the above structure, the screw head 22 is preferably a hexagonal screw head 22, which has the advantage of being small in size.

[0048] In this embodiment, when the positioning grooves 13 and the positioning protrusions 14 of the two locking blocks 10 are adapted to each other, the side walls of the positioning grooves 13 and the side walls of the positioning protrusions 14 are in transition fit or clearance fit.

[0049] In the above structure, the side wall of the positioning groove 13 and the side wall of the positioning protrusion 14 are preferably clearance-fitted.

[0050] In this embodiment, the junction between the side wall of the positioning groove 13 and the locking surface 11 is transitioned through a first chamfer / rounding 16 ; the junction between the top surface of the positioning projection 14 and the side wall is transitioned through a second chamfer / rounding 17 .

[0051] The above structure is helpful to guide the positioning groove 13 and the positioning protrusion 14 to align and engage with each other.

[0052] In this embodiment, the junction between the side wall of the positioning groove 13 and the groove bottom is transitioned through a third chamfer / rounding 18 ; the junction between the side wall of the positioning projection 14 and the locking surface 11 is transitioned through a fourth chamfer / rounding 19 .

[0053] In the above structure, stress concentration can be effectively reduced.

[0054] In this embodiment, the junction between the top surface of the positioning projection 14 and the outer side wall of the locking block 10 is transitioned through a fifth chamfer / rounding 101 .

[0055] In the above structure, since the junction between the top surface of the positioning dovetail 14 and the outer wall of the locking block 10 is easily bumped and scratched, providing a fifth chamfer / rounded transition 101 can effectively improve durability.

[0056] In this embodiment, the junction between the reference surface 12 and the outer side wall of the locking block 10 passes through a sixth chamfer / rounded transition 102 .

[0057] In the above structure, the deformation caused by right-angle docking and the influence on the installation accuracy of the reference surface 12 can be avoided.

[0058] The beneficial effects of the utility model are as follows: the reference surface 12 is used as the installation surface and contacts the mold; by arranging the positioning groove 13 and the positioning cam 14 on the locking surface 11 of the same locking block 10, and making the two present a cross, when the two locking blocks 10 are buckled with each other, the four degrees of freedom on the two-dimensional plane can be constrained and locked at the same time. Compared with the existing top lock structure, it is simpler and more convenient to install, and the installation process is greatly simplified while ensuring accuracy.

[0059] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications of the above assumptions should also be regarded as the protection scope of the present invention.

Claims

1. A cross top lock, comprising a locking block, characterized in that: The upper and lower surfaces of the locking block are respectively a locking surface and a reference surface; the locking surface is provided with a positioning groove opened from left to right and lower than the locking surface, and a positioning convex falcon opened from front to back and higher than the locking surface; the opening axis of the positioning groove and the opening axis of the positioning convex falcon are cross-arranged when projected onto the locking surface or the reference surface; the locking block is also provided with a mounting hole opened through the locking surface and the reference surface, and the center of the mounting hole coincides with the opening axis of the positioning groove and the opening axis of the positioning convex falcon arranged crosswise; the locking block consists of two pieces, and the locking surfaces of the two pieces are buckled with each other so that the positioning groove and the positioning convex falcon of one locking block are respectively matched with the positioning convex falcon and the positioning groove of the other locking block.

2. A cross top lock according to claim 1, characterized in that: The depth of the positioning groove is greater than the height of the positioning protrusion.

3. A cross top lock according to claim 1, characterized in that: A countersunk hole with an inner diameter larger than that of the mounting hole is arranged at the opening of one end of the mounting hole facing the locking surface.

4. A cross top lock according to claim 3, characterized in that: It also includes a mounting bolt, which includes a screw rod set through the mounting hole and a screw head connected to the screw rod and located in the countersunk hole. The height from the top surface of the screw head to the bottom of the countersunk hole is less than the distance from the bottom of the countersunk hole to the locking surface.

5. A cross top lock according to claim 4, characterized in that: The screw head is a hexagonal screw head.

6. A cross top lock according to claim 1, characterized in that: When the positioning grooves of the two locking blocks are matched with the positioning cams, the side walls of the positioning grooves and the side walls of the positioning cams are in transitional fit or clearance fit.

7. A cross top lock according to claim 1, characterized in that: The junction between the side wall of the positioning groove and the locking surface is transitioned through a first chamfer / rounding; the junction between the top surface of the positioning projection and the side wall is transitioned through a second chamfer / rounding.

8. A cross top lock according to claim 1 or 7, characterized in that: The junction between the side wall of the positioning groove and the groove bottom is transitioned through the third chamfer / rounding; the junction between the side wall of the positioning projection and the locking surface is transitioned through the fourth chamfer / rounding.

9. A cross top lock according to claim 8, characterized in that: The junction between the top surface of the positioning projection and the outer side wall of the locking block is transitioned through a fifth chamfer / rounding.

10. A cross top lock according to claim 1, characterized in that: The junction between the reference surface and the outer side wall of the locking block is transitioned through a sixth chamfer / rounding.

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