Mechanical self-locking type die clamping device with pressing plate capable of being retracted inwards

Abstract

The utility model relates to a mechanical self-locking die clamper with a pressing plate capable of being retracted, which comprises a die clamper body, the pressing plate, a power device and a locking pin, a sliding channel is arranged in the die clamper body, the pressing plate is in sliding fit in the sliding channel, the power device is arranged on the die clamper body, the power output end of the power device penetrates into the sliding channel to be connected with the pressing plate, and the locking pin is arranged on the die clamper body. An inner matching groove is formed in the bottom of the power output end of the power device, the locking pin is arranged in the inner matching groove in a sliding fit mode, and a locking groove allowing the locking pin to be embedded in is formed in the bottom of the sliding channel. According to the technical scheme, the pressing plate of the mold clamping device can be completely retracted into the mold clamping device body, so that the mold is allowed to be assembled and disassembled vertically, the locking force on the mold can be kept when the power of a power source is lost, the stability of the mold is not influenced, and the production safety is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of die clamps, and more particularly to a mechanical self-locking die clamp with an inwardly retractable pressure plate. Background Art

[0002] A clamp is a mechanical device used to secure mold components during mold manufacturing and processing. A clamping plate applies a locking force to ensure a stable and precise position of the mold components during manufacturing and processing. Conventional clamps typically have a clamping plate that is fully retracted into the clamp body and often lacks a self-locking mechanism. In current conventional hydraulic clamps, the clamping plate is rotatably connected to the clamp body, and the locking force is provided by a power source for the hydraulic cylinder. The hydraulic pressure in the hydraulic cylinder maintains the clamping plate in an extended position, restraining the mold components from above and applying a locking force. For example, Chinese Patent Publication No. CN218018043U, entitled "Hydraulic Long-Stroke Clamp," describes a clamp comprising a clamp body with a base at its bottom and an axis at its front and rear ends. A connecting shaft is connected to the inner cavity of the axis, and a clamping plate is connected to the outer wall of the connecting shaft. A hydraulic cylinder is connected to the rear end of the top of the clamp body, and a piston is located at the top of the cylinder. An oil inlet is located at the rear end of the clamp body.

[0003] When the pressure plate of the above-mentioned clamp rotates around the connecting shaft, the presence of the bottom clamp body limits the range of rotation, which makes it impossible for the pressure plate to be completely retracted into the clamp body, making it difficult to install and remove the mold directly, especially for thicker molds. In addition, when the oil cylinder fails, such as when the oil pipe breaks or the oil pressure is completely lost, resulting in power loss, the locking force applied by the pressure plate on the mold will also be invalid. At this time, the mold components cannot remain stable, making them prone to falling, thus posing a huge safety hazard. Summary of the Invention

[0004] In view of the above situation, in order to overcome the problem that the existing mold clamps do not support straight-up and straight-down mold installation and removal, and when the power source fails and the power is lost, the locking force applied by the pressure plate on the mold will also fail, causing the mold components to be unable to remain stable, thus posing a huge safety hazard, the purpose of the utility model is to provide a mold clamp that can fully retract the pressure plate into the mold clamp body, thereby allowing straight-up and straight-down mold installation and removal, and can maintain the locking force on the mold when the power source loses power, so that the stability of the mold is not affected, thereby ensuring production safety.

[0005] In order to achieve the above object, the technical solution of the present invention is:

[0006] A mechanical self-locking clamp with an inwardly retractable pressure plate comprises a clamp body, a pressure plate, a power unit and a locking pin. A sliding channel is provided in the clamp body, and the pressure plate is slidably fitted in the sliding channel. The power unit is provided on the clamp body, and its power output end passes through the sliding channel and is connected to the pressure plate. An inner fitting groove is provided at the bottom of the power output end of the power unit, and the locking pin is slidably fitted in the inner fitting groove. A locking groove for the locking pin to be embedded is provided at the bottom of the sliding channel.

[0007] Preferably, the locking groove is arc-shaped, and its depth is smaller than the diameter of the locking pin.

[0008] Preferably, the outer shape of the pressing plate is arc-shaped, and the sliding channel is an arc-shaped channel adapted to the pressing plate.

[0009] Preferably, the power output end of the power device is hinged to the pressure plate.

[0010] Preferably, an outer matching groove is provided at the bottom of the pressure plate, the outer matching groove is communicated with the inner matching groove, and the locking pin is also slidably fitted in the inner matching groove.

[0011] Preferably, the diameter of the outer fitting groove is larger than the diameter of the inner fitting groove.

[0012] Preferably, the power unit is an oil cylinder, which includes a cylinder body, a cylinder head and a piston rod. The cylinder head is arranged on the cylinder body. The piston rod slides with the inner cavity of the cylinder body, extends outward through the cylinder head, and is connected to the pressure plate. A first oil filling port and a second oil filling port are provided on the cylinder body.

[0013] Preferably, the clamp body includes an upper shell and a lower shell, the upper shell and the lower shell are fixed by bolts, the sliding channel includes an upper channel groove and a lower channel groove, the upper channel groove and the lower channel groove are respectively located on the upper shell and the lower shell, and the locking groove is located on the lower shell.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] The clamping device of the utility model drives the pressure plate to move along the sliding channel through the power output end of its power device, and the power output end of the power device also drives the locking pin located in the inner matching groove at the bottom thereof to move synchronously. When the inner matching groove has not reached the relative position with the locking groove, the lower end of the inner matching groove is closed by the inner wall of the sliding channel, so that the locking pin is restricted in the inner matching groove and cannot move outward. When the inner matching groove is relative to the locking groove, the lower end opening is opened, and a space is provided for the locking pin to allow outward movement. Under the action of gravity, the locking pin will fall into the locking groove, and synchronously cooperate with the inner matching groove and the locking groove. At this time, the inner wall of the locking groove is used to abut against the locking pin to limit its further movement, and the power of the power device is locked to the power output end by the locking pin, so that the pressure plate remains in the extended state. Even if the power device loses power due to a malfunction at this time, the pressure plate can still continue to apply locking force to the mold component, ensuring that the mold is stable and can still be firmly fixed on the injection molding machine plate, thereby providing a strong safety guarantee for production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the clamp when the clamping plate of the utility model moves into the external space;

[0017] Figure 2 This is a schematic diagram of the overall structure of the clamp of the utility model when the clamping plate is retracted into the clamp body;

[0018] Figure 3 This is a schematic diagram of the complete decomposition structure of the mold clamp of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the clamp of the present invention when the clamp pressure plate is retracted into the clamp body and the upper and lower housings of the clamp body are separated;

[0020] Figure 5 This is a schematic cross-sectional view of the clamping plate of the utility model when it moves into the external space;

[0021] Figure 6 This is a schematic cross-sectional view of the clamping plate of the utility model when it is retracted into the clamping body;

[0022] Figure 7 This is a schematic diagram of the overall structure of the utility model when the mold clamp is installed on the table and the pressure plate is moved to the external space to lock the mold parts;

[0023] Figure 8 The utility model is a schematic diagram of the overall structure of the mold clamp installed on the table, and the pressure plate is retracted into the mold clamp body for straight-up and straight-down mold installation and removal.

[0024] As shown in the figure:

[0025] 1. Clamp body; 1a. Sliding channel; 101. Upper shell; 101a. Upper channel groove; 102. Lower shell; 102a. Lower channel groove; 102b. Locking groove; 2. Press plate; 201. External matching groove; 3. Power unit; 301. Cylinder; 301a. Internal matching groove; 301b. Cylinder body; 301c. Cylinder head; 301d. Piston rod; 301e. First oil filling port; 301f. Second oil filling port; 4. Locking pin; 5. Bolt. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of simplifying the description, and do not indicate or imply that the directions are specific directions that must be possessed, specific direction structures and operations, and therefore should not be understood as limiting the present invention.

[0028] like Figure 1 Place, Figure 2 as well as Figures 5 to 8As shown, the utility model relates to a mechanical self-locking clamp with an inwardly retractable pressure plate, which includes a clamp body 1, a pressure plate 2, a power device 3 and a locking pin 4, wherein the clamp body 1 needs to be installed on a table 7 of a mold clamping unit of an injection molding machine, and a sliding channel 1a is provided in the clamp body 1. The sliding channel 1a is an open channel running through the front and rear ends of the clamp body 1, thereby communicating with the external space, and the pressure plate 2 is inserted in the sliding channel 1a and forms a sliding fit with the sliding channel 1a. The pressure plate 2 enters the external space or retracts into the clamp body 1 by reciprocating along the sliding channel 1a. After entering the external space, the pressure plate 2 can form a step position with the outer wall of the clamp body 1, and a step position is formed between the step position and the mold component 6 to be fixed, so that the mold component 6 is clamped between the pressure plate 2 and the table 7, thereby ensuring that the mold can be fixed without the help of a screw. It can be firmly fixed on the table 7, thereby improving the efficiency, safety and consistency of mold installation and injection molding production. The step disappears when the pressure plate 2 is retracted into the clamp body 1. In the present invention, the shape of the sliding channel 1a matches the pressure plate 2, and its length is at least equal to the length of the pressure plate 2. This allows the fixed mold component 6 to move in a direction perpendicular to the table 7 when the pressure plate 2 is retracted into the clamp body 1, realizing straight up and down mold installation and removal, so that molds with larger thicknesses can also be installed on the injection molding machine; the power device 3 is provided on the clamp body 1, and its power output end passes through an opening of the sliding channel 1a to the inside of the sliding channel 1a and is connected to the pressure plate 2. The power device 3 provides power for the movement of the pressure plate 2 through its power output end, driving it to automatically move back and forth along the sliding channel 1a, further improving the efficiency of mold component 6 installation and injection molding production;An inner matching groove 301a is provided at the bottom of the power output end of the power device 3, that is, the inner matching groove 301a is a groove with an opening at the lower end. The locking pin 4 is inserted into the inner matching groove 301a and slides with the inner matching groove 301a. During the movement of the locking pin 4, it can move to the outside through the opening at the lower end of the inner matching groove 301a. The locking pin 4 located in the inner matching groove 301a can also be driven to move back and forth synchronously when the power output end of the power device 3 moves. A locking groove 102b for the locking pin 4 to be embedded in the bottom of the sliding channel 1a is provided. When the power output end of the power device 3 moves, its inner matching groove 301a will pass through the locking groove 102b, so that it can reach the opposite side of the locking groove 102b during the process. At this time, under the action of gravity, the locking pin 4 will fall into the locking groove 102b, realizing synchronous cooperation with the inner matching groove 301a and the locking groove 102b, thereby locking the power output end of the power device 3. It should be mentioned that the locking groove 102b is located on the side of the sliding channel 1a away from the power device 3, ensuring that the pressure plate 2 remains extended in this state. The clamp of the utility model is connected to the power device 3 through its The power output end drives the pressure plate 2 to move along the sliding channel 1a, and the power output end of the power device 3 will also drive the locking pin 4 located in the inner matching groove 301a at its bottom to move synchronously. When the inner matching groove 301a has not reached the relative position with the locking groove 102b, the lower end of the inner matching groove 301a is closed by the inner wall of the sliding channel 1a, which makes the locking pin 4 restricted in the inner matching groove 301a and unable to move to the outside. When the inner matching groove 301a is opposite to the locking groove 102b, the lower end opening is opened, and provides space for the locking pin 4 to move outward. Under the action of force, the locking pin 4 will fall into the locking groove 102b, and synchronize with the inner matching groove 301a and the locking groove 102b. At this time, the inner wall of the locking groove 102b contacts the locking pin 4 to limit its further movement. The locking pin 4 locks the power output of the power device 3, so that the pressure plate 2 remains in the extended state. Even if the power device 3 loses power due to a malfunction at this time, the pressure plate 2 can still continue to apply locking force to the mold component 6, ensuring that the mold is firmly fixed on the injection molding machine plate 7, thereby providing a strong safety guarantee for production.

[0029] like Figure 5 and Figure 6As shown, when the power device 3 does not have a power failure, in order to enable the pressure plate 2 to retract into the interior of the clamp body 1, the utility model sets the shape of the locking groove 102b to an arc, so that when the locking pin 4 is synchronously moved back by the power output end of the power device 3, the locking groove 102b can provide a guide for the locking pin 4, ensuring that the locking pin 4 can move to the outside of the locking groove 102b and the inside of the inner matching groove 301a, thereby smoothly pulling the locking groove 102b, avoiding the power device 3 from causing obstruction to the return movement of the pressure plate 2 when there is no power failure. The depth of the locking groove 102b is less than the diameter of the locking pin 4. When the inner matching groove 301a is opposite to the locking groove 102b, the locking pin 4 can still maintain cooperation with the inner matching groove 301a, avoiding the locking pin 4 completely disengaging from the inner matching groove 301a and causing the locking of the pressure plate 2 to fail.

[0030] like Figures 3 to 6 As shown, the outer shape of the pressing plate 2 is arc-shaped, and the sliding channel 1a is an arc-shaped channel adapted to the pressing plate 2. The pressing plate 2 is guided by the arc-shaped channel, so that the moving path is correspondingly arc-shaped, so that the pressing plate 2 can complete the lifting and pressing actions during the movement. More specifically, when the pressing plate 2 moves toward the external space, it presses down to apply a locking force to the mold component 6 placed on the injection molding machine table 7, and lifts up when retracting to release the force, preparing for straight up and down mold installation and removal.

[0031] Furthermore, the power output end of the power device 3 is hinged to the pressure plate 2, that is, the linear motion of the power output end of the power device 3 can be converted into an arc motion that moves the pressure plate 2 along the sliding channel 1a, so that the power device 3 can use conventional devices such as the oil cylinder 301 and the air cylinder, thereby reducing the requirements for the configuration of the power device 3.

[0032] like Figures 3 to 6 As shown, an outer mating groove 201 is provided at the bottom of the pressure plate 2, and the outer mating groove 201 is connected to the inner mating groove 301a, and the locking pin 4 is also slidably fitted in the inner mating groove 301a, so that the locking pin 4 also has the function of a rotating shaft, and the pressure plate 2 can rotate around the locking pin 4 relative to the power output end of the power device 3, so that it can complete the lifting and pressing actions during the movement. The above-mentioned setting utilizes the dual-purpose function of the locking pin 4 to simplify the structure of the connection between the power output end of the power device 3 and the pressure plate 2, which not only reduces the assembly difficulty of the mold clamp of the present invention but also reduces the manufacturing cost. In addition, when the locking pin 4 slides along the inner mating groove 301a, it also slides in the outer mating groove 201 synchronously, and after the locking pin 4 falls into the locking groove 102b, it can still maintain cooperation with the outer mating groove 201, avoiding the separation of the locking pin 4 and the pressure plate 2, so that the power output end of the power device 3 and the pressure plate 2 maintain a stable connection.

[0033] like Figure 5 and Figure 6As shown, the diameter of the outer mating groove 201 is larger than the diameter of the inner mating groove 301a, so that the outer mating groove 201 provides a certain margin space for the locking pin 4. When the locking pin 4 is mated with the locking groove 102b and the pressure plate 2 needs to be retracted into the interior of the clamp body 1, the locking pin 4 is first driven by the power output end of the power device 3 to disengage from the locking groove 102b. After disengagement, as it moves further, it contacts the outer mating groove 201 to drag the pressure plate 2 to move, thereby reducing the resistance encountered by the locking pin 4 during its movement out of the locking groove 102b.

[0034] like Figures 3 to 6 As shown, the power device 3 is an oil cylinder 301, which consists of a cylinder body 301b, a cylinder head 301c and a piston rod 301d. The cylinder body 301b has a hollow inner cavity, and the cylinder head 301c is provided on the cylinder body 301b to seal the inner cavity of the cylinder body 301b. The piston rod 301d is the power output end. The inner matching groove 301a is provided on the piston rod 301d, which is slidably matched with the inner cavity of the cylinder body 301b, and extends outward through the cylinder head 301c and is connected to the pressure plate 2. The cylinder body 301b is provided with a first oil filling port 301e and a second oil filling port 301f for pushing its power output end to move back and forth when oil is supplied. The first oil filling port 301e and the second oil filling port 301f are connected to the hydraulic oil input end through an oil supply pipeline. The piston rod 301d divides the inner cavity of the cylinder body 301b into a front cavity and a The rear cavity, the first oil filling port 301e and the second oil filling port 301f are connected to the front cavity and the rear cavity respectively. When hydraulic oil is injected through the first oil filling port 301e, the piston rod 301d is pushed to move out of the cylinder body 301b under the action of oil pressure, and the corresponding piston rod 301d drives the pressure plate 2 to move along the sliding channel 1a toward the external space. When hydraulic oil is injected through the second oil filling port 301f, the piston rod 301d is pushed to retract into the cylinder body 301b, and the corresponding piston rod 301d drives the pressure plate 2 to retract along the sliding channel 1a into the clamp body 1. In the above configuration, the hydraulic system composed of the oil cylinder 301, the oil supply pipeline and the hydraulic oil input end can usually provide a strong driving force for the pressure plate 2. Due to the incompressibility of the hydraulic oil, the energy can be more effectively converted into mechanical energy to move the pressure plate 2.

[0035] like Figure 3 and Figure 4As shown, the clamp body 1 includes an upper shell 101 and a lower shell 102, which are fixed by bolts 5. The sliding channel 1a includes an upper channel groove 101a and a lower channel groove 102a, which are respectively located on the upper shell 101 and the lower shell 102. The upper shell 101 and the lower shell 102 are opposite to each other on the sides where the upper channel groove 101a and the lower channel groove 102a are formed, and are fixed by bolts 5. At this time, the upper channel groove 101a and the lower channel groove 102a remain opposite to each other and connected in vertical direction, thereby forming the sliding channel 1a. The locking groove 102b is located on the lower shell 102.

[0036] Combine Figures 1 to 8 , the mold clamp of the present invention is fixed on the table 7 of the injection molding machine through the mold clamp body 1, and the hydraulic oil input end is connected to the first oil filling port 301e and the second oil filling port 301f of the power device 3 of the oil cylinder 301. After the installation is completed, the mold can be installed and removed. When installing the mold, hydraulic oil is input into the first oil filling port 301e of the oil cylinder 301, so that the piston rod 301d moves toward the outside of the cylinder body 301b under the action of oil pressure, thereby pushing the pressure plate 2 to move along the sliding channel 1a of the mold clamp body 1 toward the external space. During the movement of the pressure plate 2, it is gradually pressed down, thereby pressing the fixed mold and movable mold on the fixed mold table 7 and the movable mold table 7. In the process of the movement of the pressure plate 2, its outer matching groove 201 and the inner matching groove 301a at the bottom of the power output end of the power device 3 and the locking groove 102b are opposite to each other. Under the action of gravity, the locking pin 4 will move along the inner matching groove 30 1a and the outer matching groove 201 slide and fall into the locking groove 102b, and cooperate with the locking groove 102b synchronously. The inner wall of the locking groove 102b is used to abut against the locking pin 4 to limit its further movement. The locking pin 4 locks the power output end of the power unit 3, so that the pressure plate 2 remains in the extended state. At this time, the pressure plate 2 can be immune to the influence of power failure of the power unit 3. When the pressure plate 2 is to be retracted into the clamp body 1, the hydraulic oil input end is first directed to the second oil filling port 301f of the oil cylinder 301. Under the action of oil pressure, the power output end of the power unit 3 will first drive the locking pin 4 to disengage from the locking groove 102b. After disengagement, as it moves further, it will abut against the outer matching groove 201 to drag the pressure plate 2 to move until the pressure plate 2 is completely retracted into the clamp body 1, so that the step between the pressure plate 2 and the outer wall of the clamp body 1 disappears. At this time, the mold can be installed and removed directly.

[0037] The above embodiments and descriptions are only for explaining the principles and best embodiments of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, which shall fall within the scope of the invention to be protected.

Claims

1. A mechanical self-locking clamp with an inwardly retractable pressure plate, characterized in that: It comprises a clamp body (1), a pressure plate (2), a power device (3) and a locking pin (4); a sliding channel (1a) is provided in the clamp body (1); the pressure plate (2) is slidably fitted in the sliding channel (1a); the power device (3) is arranged on the clamp body (1); its power output end passes through the sliding channel (1a) and is connected to the pressure plate (2); an inner fitting groove (301a) is provided at the bottom of the power output end of the power device (3); the locking pin (4) is slidably fitted in the inner fitting groove (301a); and a locking groove (102b) for the locking pin (4) to be embedded is provided at the bottom of the sliding channel (1a).

2. A mechanical self-locking clamp with an inwardly retractable pressure plate according to claim 1, characterized in that: The locking groove (102b) is arc-shaped, and its depth is smaller than the diameter of the locking pin (4).

3. A mechanical self-locking clamp with an inwardly retractable pressure plate according to claim 1 or 2, characterized in that: The outer shape of the pressing plate (2) is arc-shaped, and the sliding channel (1a) is an arc-shaped channel adapted to the pressing plate (2).

4. A mechanical self-locking clamp with an inwardly retractable pressure plate according to claim 3, characterized in that: The power output end of the power device (3) is hinged to the pressure plate (2).

5. A mechanical self-locking die clamp with an inwardly retractable pressure plate according to claim 4, characterized in that: An outer matching groove (201) is provided at the bottom of the pressure plate (2), the outer matching groove (201) and the inner matching groove (301a) are connected, and the locking pin (4) is also slidably fitted in the inner matching groove (301a).

6. A mechanical self-locking die clamp with an inwardly retractable pressure plate according to claim 5, characterized in that: The diameter of the outer matching groove (201) is greater than the diameter of the inner matching groove (301a).

7. A mechanical self-locking die clamp with an inwardly retractable pressure plate according to any one of claims 1, 2, 4, 5 or 6, characterized in that: The power device (3) is an oil cylinder (301), and the oil cylinder (301) comprises a cylinder body (301b), a cylinder cover (301c), and a piston rod (301d). The cylinder cover (301c) is mounted on the cylinder body (301b). The piston rod (301d) is slidably engaged with the inner cavity of the cylinder body (301b), extends outward through the cylinder cover (301c), and is connected to the pressure plate (2). The cylinder body (301b) is provided with a first oil filling port (301e) and a second oil filling port (301f).

8. A mechanical self-locking die clamp with an inwardly retractable pressure plate according to claim 7, characterized in that: The clamp body (1) comprises an upper shell (101) and a lower shell (102), wherein the upper shell (101) and the lower shell (102) are fixed by bolts (5), and the sliding channel (1a) comprises an upper channel groove (101a) and a lower channel groove (102a), wherein the upper channel groove (101a) and the lower channel groove (102a) are respectively located on the upper shell (101) and the lower shell (102), and the locking groove (102b) is located on the lower shell (102).

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