Mechanical self-locking type die clamping device

Abstract

The utility model relates to a mechanical self-locking type die clamping device which comprises a die clamping device body, a pressing plate, a power device, a locking plug and a spring, a sliding channel is formed in the die clamping device body, the pressing plate is in sliding fit with the sliding channel, the power device is arranged on the die clamping device body, and the power output end of the power device penetrates into the sliding channel to be connected with the pressing plate. A mounting cavity is formed in the die clamping device body and communicates with the sliding channel, the locking plug and the spring are both arranged in the mounting cavity, and the spring is located at the lower end of the locking plug and abuts against the locking plug. According to the technical scheme, interference caused when the die is assembled and disassembled can be avoided, meanwhile, self-locking can be achieved when power is lost, the self-locking structure cannot lose efficacy, and therefore the self-locking effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of clamping devices, and more specifically, to a mechanical self-locking clamping device. Background Art

[0002] Injection molds need to be precisely aligned and fixed with the clamping unit of an injection molding machine to ensure that the cavities of the molds can be accurately closed, so as to produce products with precise dimensions. At the same time, during the injection process, when molten plastic is injected into the mold cavity or when the mold is opened and closed, the mold will withstand relatively high pressures. Fixing the mold can ensure that the mold does not deform or shift under high pressure, and further ensure the stability of the shape and dimensions of the product.

[0003] In traditional technologies, molds are generally fixed to the injection molding machine through screws. This requires manual use of tools such as wrenches to separately install the stationary mold and the moving mold of the mold on the stationary mold platen and the moving mold platen of the clamping unit of the injection molding machine. When removing, it still relies on manual removal one by one, which is not only laborious, but also has a low disassembly and assembly efficiency. At the same time, there are differences in the tightening force of bolts by different operators, which may cause the mold to not be firmly fixed to the injection molding machine. In addition, the large demolding force during mold opening is likely to cause the bolts to loosen, affecting the fixing stability, and even causing the mold to loosen and fall, posing safety risks to operators and equipment.

[0004] However, using a clamping device to fix the mold can significantly improve the efficiency, safety, and consistency of injection molding production, while reducing labor costs and maintenance costs. Chinese Patent with Publication No. CN215620236U discloses a clamping device for quickly fixing the mold. When using this clamping device to fix the mold, it is necessary to first unscrew the bolts, then place the mold between two support frames on the upper surface of the placement plate. Subsequently, under the joint cooperation of the slide rail and the slider, the right-angle plate is adjusted, and the upper wall of the right-angle plate is adjusted to a position higher than the mold. After tightening the bolts, the mold is initially fixed. Finally, two hydraulic cylinders are started, and the two hydraulic cylinders drive two clamping plates to move downward to clamp and fix the mold. In this technical solution, the pressure plate connected to the hydraulic cylinder always remains above the placement plate for fixing the mold, resulting in interference from the pressure plate when fixing the mold, making it difficult to directly install and remove the mold vertically, especially for molds with a relatively large thickness.

[0005] In response to this, a clamping die holder with a large hydraulic stroke is disclosed in Chinese Patent No. CN218018043U. It includes a fixture body, a base is provided at the bottom of the fixture body, axles are provided at the front and rear ends of the fixture body, a connecting shaft is connected to the inner cavity of the axle, a pressing plate is connected to the outer wall of the connecting shaft, an oil cylinder is connected to the rear end of the top of the fixture body, a piston is provided at the top of the oil cylinder, and an oil inlet hole is provided at the rear end of the fixture body; another clamping die holder disclosed in Chinese Patent No. CN214395210U with the patent name of "an arc-shaped pressing plate clamping die holder" includes an oil cylinder piston body, a screw rod, a base and an arc-shaped pressing plate one. Groove plates are respectively installed at the bottom of the base. A slide rod is installed in the groove body two through a linear slide rail two. An arc-shaped pressing plate one and an arc-shaped pressing plate two are installed through the slide rod in a matching manner. Pressure surface blocks are provided between one sides of the arc-shaped pressing plate one and the arc-shaped pressing plate two. The oil cylinder piston body is installed through the screw rod in a matching manner. Although the pressing plates of the clamping die holders in the above technical solutions can avoid interference during the installation and removal of the mold, there are other problems. That is, when a failure occurs in the power source, such as all the oil pipes are broken or the oil pressure is completely lost, the positioning function of the pressing plate fails, and the mold cannot be correctly clamped, resulting in the mold being prone to move or even fall during the injection molding process, thus there are huge safety hazards.

[0006] In order to address the problem that the pressing plate cannot self-lock when the power source suddenly fails, a self-locking clamping die holder disclosed in Chinese Patent No. CN215661465U includes a clamping die holder body and a pressure maintaining valve. The pressure maintaining valve is communicated with the clamping die holder body. The pressure maintaining valve includes a pressure maintaining block. The pressure maintaining block is provided with an oil inlet and an oil outlet, and the oil outlet of the pressure maintaining block is communicated with the hydraulic oil inlet on the clamping die holder body. A cavity is provided between the oil inlet and the oil outlet, and the oil inlet, the cavity and the oil outlet are communicated in sequence. A pressure relief rod, a check valve seat and a plug are provided in the cavity. The pressure relief rod is arranged in the cavity and is movably connected with the pressure maintaining block. The pressure relief rod is used to push the check valve seat to move, and the check valve seat and the plug are connected by a spring.

[0007] The hydraulic oil of the above self-locking clamping die holder enters the pressure maintaining block from the oil inlet of the pressure maintaining valve. When the oil pressure is relatively high, the hydraulic oil pushes the pressure relief rod upwards. The hydraulic oil enters the cavity and pushes open the check valve seat, so that the check valve seat is compressed. At this time, the oil inlet, the cavity and the oil outlet are communicated, and the hydraulic oil enters the hydraulic oil inlet on the clamping die holder body through the oil outlet. When the oil pressure is relatively low, the hydraulic oil entering the oil inlet is not enough to move the check valve seat. The pressure relief rod drops and its bottom end pushes down the check valve seat, so that the hydraulic oil enters the clamping die holder. However, when a fault occurs on the oil supply side during the clamping of the mold, the hydraulic pressure near the oil supply side in the oil circuit drops first. At this time, the hydraulic oil in the clamping die holder body will flow back, resulting in a decrease in the hydraulic pressure in the clamping die holder body. That is to say, the pressure relief rod only drops and contacts the check valve seat when the oil circuit pressure drops to a certain level. This will cause the self-locking of the pressing plate to have the possibility of instantaneous failure, affecting the self-locking effect. Summary of the Invention

[0008] In view of the above situation, in order to overcome the problems that some of the existing clamping die platen are prone to interfere with the loading and unloading of the die and cannot be self-locked, and the self-locking of the self-locking clamping die platen may have instantaneous failure, resulting in the problem of affecting the self-locking effect, the purpose of the present utility model is to provide a mechanical self-locking clamping die platen that can avoid interference during the loading and unloading of the die, can be self-locked at the same time, and the self-locking structure will not fail, so as to have a good self-locking effect.

[0009] In order to achieve the above purpose, the technical solution of the present invention is:

[0010] In view of the above situation, in order to overcome the problems that some of the existing clamping die platen are prone to interfere with the loading and unloading of the die and cannot be self-locked, and the self-locking of the self-locking clamping die platen may have instantaneous failure, resulting in the problem of affecting the self-locking effect, the purpose of the present utility model is to provide a mechanical self-locking clamping die platen that can avoid interference during the loading and unloading of the die, can be self-locked when the power is lost, and the self-locking structure will not fail, so as to have a good self-locking effect.

[0011] A mechanical self-locking clamping die platen, which includes a clamping die platen body, a platen, a power device, a locking plug and a spring. A sliding channel is provided in the clamping die platen body, and the platen is slidably matched with the sliding channel. The power device is arranged on the clamping die platen body, and its power output end penetrates into the sliding channel to be connected with the platen. An installation cavity is provided in the clamping die platen body, and the installation cavity is communicated with the sliding channel. The locking plug and the spring are both arranged in the installation cavity, and the spring is located at the lower end of the locking plug and abuts against each other.

[0012] Preferably, an oil storage groove is provided on the inner wall of the installation cavity, the oil storage groove is close to the upper end of the locking plug, and the oil storage groove is communicated with an oil supply channel.

[0013] Preferably, a fitting groove is provided on the platen, and the locking plug prevents the platen from moving by being embedded in the fitting groove.

[0014] Preferably, the outer shape of the platen is arc-shaped, and the sliding channel is an arc-shaped channel adapted to the platen.

[0015] Preferably, the power output end of the power device is hinged to the platen.

[0016] Preferably, a guide rod is provided on the platen, and a guide groove is provided on the power output end of the power device, and the guide groove is slidably matched with the guide rod.

[0017] Preferably, the power device is an oil cylinder, and the oil cylinder includes a cylinder body, a cylinder head and a piston rod. The cylinder head is covered on the cylinder body, the piston rod is slidably matched with the inner cavity of the cylinder body, passes through the cylinder head and extends outward, and is connected with the platen. The cylinder body is provided with a first oil injection port and a second oil injection port for pushing its power output end to reciprocate when oil is supplied.

[0018] Preferably, a spring seat is further provided in the installation cavity, and the spring is installed on the spring seat.

[0019] Preferably, the clamping die 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 respectively opened on the upper shell and the lower shell, and the installation cavity is opened on the lower shell.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] (1) The pressing plate is arranged in the sliding channel and is slidably matched with the sliding channel. The pressing plate can reciprocate along the sliding channel, so as to move to the external space or retract into the clamping die body. When the pressing plate moves to the external space, a step position is formed between the pressing plate and the outer wall of the clamping die body. Through this step position, a step fit is formed with the fixed die or moving die of the mold, so that the fixed die or moving die is clamped between the pressing plate and the fixed die table or moving die table, so that the mold does not need to be fixed to the fixed die table and the moving die table by means of screws, thereby improving the efficiency, safety and consistency of mold installation and injection molding production. At the same time, this step position disappears when the pressing plate retracts into the clamping die body, so that the fixed die and moving die of the fixed mold can move in a direction perpendicular to the fixed die table and the moving die table, realizing the direct loading and unloading of the mold, and enabling a mold with a larger thickness to be installed on the injection molding machine.

[0022] (2) The locking plug and the spring form a mechanical self-locking structure that restricts the movement of the pressing plate. The spring enables the locking plug to be in the sliding channel without additional energy input, and the state of the spring is not affected by the power of the power device, thereby preventing the locking plug from disengaging from the sliding channel under unexpected circumstances. When the fixed die and moving die of the mold are fixed on the fixed die table and moving die table of the injection molding machine, if the power device fails and causes power loss, the pressing plate can still remain in the extended state relative to the clamping die body, solving the problem of instantaneous failure of self-locking in the prior art and ensuring the stability and reliability of the connection between the mold and the injection molding machine when the power device fails. Description of the Drawings

[0023] Figure 1 is the overall structural schematic diagram when the pressing plate of the clamping die of the present utility model moves to the external space;

[0024] Figure 2 is the overall structural schematic diagram when the pressing plate of the clamping die of the present utility model retracts into the clamping die body;

[0025] Figure 3 is the structural schematic diagram when the clamping die of the present utility model is connected to the table (fixed die table or moving die table) and its pressing plate retracts into the clamping die body;

[0026] Figure 4 is the present utility model Figure 3 is the enlarged structural schematic diagram of part A;

[0027] Figure 5 It is a schematic structural diagram when the clamping device of the present utility model is connected to the table (fixed mold table or moving mold table) and its pressing plate moves into the external space;

[0028] Figure 6 is the present utility model Figure 5 Schematic enlarged structural diagram of part B;

[0029] Figure 7 It is a schematic exploded structural diagram of the clamping device body of the present utility model;

[0030] Figure 8 It is a schematic structural diagram when the upper shell and the lower shell of the clamping device body of the present utility model are separated;

[0031] Figure 9 is the present utility model Figure 8 Schematic enlarged structural diagram of part C;

[0032] Figure 10 It is a schematic exploded structural diagram of the clamping device body of the clamping device of the present utility model;

[0033] Figure 11 It is a schematic sectional structural diagram when the pressing plate of the clamping device of the present utility model moves into the external space;

[0034] Figure 12 It is a schematic sectional structural diagram when the pressing plate of the clamping device of the present utility model retracts into the clamping device body.

[0035] As shown in the figure:

[0036] 1. Clamping device body; 1a. Sliding channel; 101. Upper shell; 101a. Upper channel groove; 102. Lower shell; 102a. Installation cavity; 102b. Oil storage tank; 102c. Oil supply channel; 102d. Lower channel groove; 103. Bolt; 2. Pressing plate; 201. Fitting groove; 3. Power device; 301. Oil cylinder; 301a. Cylinder body; 301b. Cylinder head; 301c. Piston rod; 301d. First oil injection port; 301e. Second oil injection port; 301f. Guide groove; 4. Locking plug; 5. Spring; 6. Guide rod; 7. Spring seat; 8. Table; 9. Mold. Specific embodiments

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use. It is only for the convenience of simplified description, rather than indicating or implying that this orientation is a specific orientation that must be had, as well as a specific orientation structure and operation. Therefore, it should not be construed as a limitation to the present invention.

[0039] As Figure 1 , Figure 2 , Figure 7 , Figure 11 and Figure 12 shown, the present utility model relates to a mechanical self-locking mold clamping device, which comprises a mold clamping device body 1, a pressure plate 2, a power device 3, a locking plug 4 and a spring 5;

[0040] As Figures 3 to 6 shown, the mold clamping device body 1 is used for being installed on the fixed mold platen and the moving mold platen of the clamping unit of an injection molding machine. A sliding channel 1a is formed in the mold clamping device body 1, and the sliding channel 1a runs through the front and rear ends of the mold clamping device body 1, so as to communicate with the external space;

[0041] As Figure 7 , Figure 11 and Figure 12 shown, the pressure plate 2 is arranged in the sliding channel 1a and is in sliding fit with the sliding channel 1a. The pressure plate 2 can reciprocate along the sliding channel 1a, so as to move to the external space or retract into the mold clamping device body 1. When the pressure plate 2 moves to the external space, a step position is formed between the pressure plate 2 and the outer wall of the mold clamping device body 1. Through this step position, a step fit is formed with the fixed mold or the moving mold of the mold, so that the fixed mold or the moving mold is clamped between the pressure plate 2 and the fixed mold platen or the moving mold platen, enabling the mold to be fixed to the fixed mold platen and the moving mold platen without the aid of a screw, thereby improving the efficiency, safety and consistency of mold installation and injection molding production. At the same time, this step position disappears when the pressure plate 2 retracts into the mold clamping device body 1, enabling the fixed mold and the moving mold of the mold to move in a direction perpendicular to the fixed mold platen and the moving mold platen, realizing straight-up-and-down mold loading and unloading, and enabling molds with a larger thickness to be installed on the injection molding machine;

[0042] As Figure 11 and Figure 12 shown, the power device 3 is arranged on the mold clamping device body 1, and its power output end penetrates into the sliding channel 1a to be connected with 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 reciprocate along the sliding channel 1a, further improving the efficiency of mold installation and injection molding production;

[0043] As Figures 1 to 5 , Figure 7 , Figure 11 andFigure 12 As shown, a mounting cavity 102a is provided in the clamp body 1, and the mounting cavity 102a is a through cavity, which is communicated with the sliding channel 1a. The locking plug 4 and the spring 5 are both arranged in the mounting cavity 102a. The spring 5 is located at the lower end of the locking plug 4 and abuts against each other, so that the locking plug 4 is supported by the spring 5. In other words, the spring 5 supports the locking plug 4 so that it is embedded in the sliding channel 1a, thereby blocking the pressure plate 2 from restricting its movement, and the locking plug 4 and the spring 5 are elastically connected. The position of the locking plug 4 is affected by the state of the spring 5. When the spring 5 is compressed, the position of the locking plug 4 will change. For example, when the spring 5 is compressed, the locking plug 4 will move downward and disengage from the sliding channel 1a, thereby releasing the restriction on the movement of the pressure plate 2, and the power device 3 can work normally. In order to avoid the reciprocating movement of the pressure plate 2 being affected, the utility model forms a mechanical self-locking structure for limiting the movement of the pressure plate 2 through the locking plug 4 and the spring 5. The spring 5 allows the locking plug 4 to be in the sliding channel 1a without additional energy input, and the state of the spring 5 is not affected by the power of the power device 3, thereby preventing the locking plug 4 from accidentally escaping from the sliding channel 1a. When the fixed mold and the movable mold of the mold are fixed on the fixed mold platen and the movable mold platen of the injection molding machine, if the power device 3 fails and causes power loss, the pressure plate 2 can still remain extended relative to the clamp body 1, which solves the problem of instantaneous failure of self-locking in the prior art and ensures the stable and reliable connection between the mold and the injection molding machine when the power device 3 fails.

[0044] like Figure 7 , Figure 11 and Figure 12 As shown, an oil storage tank 102b is provided on the inner wall of the installation cavity 102a, the oil storage tank 102b is close to the upper end of the locking plug 4, and the oil storage tank 102b is connected to the oil supply channel 102c, and the oil supply channel 102c is connected to the hydraulic oil input end. The movable locking plug 4 divides the installation cavity 102a into two upper and lower cavities, and the volumes of the two cavities change with the movement of the locking plug 4. The spring 5 is located in the lower cavity, and the oil storage tank 102b is located in the upper cavity. The hydraulic oil is input into the oil supply channel 102c, and the hydraulic oil passes through the oil supply channel 102c enters the top of the installation cavity 102a, and under the action of oil pressure, the locking plug 4 can be pushed down and the spring 5 can be compressed, so that it can overcome the influence of the supporting force of the spring 5 and realize the separation from the sliding channel 1a. Correspondingly, when the hydraulic oil in the oil storage cavity is gradually emptied, the spring 5 can drive the locking plug 4 to reset and enter the sliding channel 1a again. This can be regarded as a situation where the oil pressure is lost due to a failure of the hydraulic oil input end or a burst of the oil supply pipeline. At this time, the mechanical self-locking structure composed of the spring 5 and the locking plug 4 can still achieve the locking of the pressure plate 2.

[0045] like Figures 7 to 9 , Figure 11 and Figure 12As shown, a fitting groove 201 is formed on the pressing plate 2. When the pressing plate 2 moves, the fitting groove 201 can reach a relative position with the installation cavity 102a. The locking plug 4 is inserted into the fitting groove 201 to form a mating with the inner wall of the fitting groove 201, thereby preventing the pressing plate 2 from moving and realizing the locking of the pressing plate 2.

[0046] As Figure 11 and Figure 12 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. Thus, during the movement, the pressing plate 2 can complete the lifting and pressing actions. More specifically, when the pressing plate 2 moves towards the external space, it presses down to clamp the moving die and the fixed die placed on the fixed die table and the moving die table of the injection molding machine, and lifts up when retracting to release the clamping, preparing for mold loading and unloading.

[0047] As Figures 7 to 9 , Figure 11 and Figure 12 shown, the power output end of the power device 3 is hinged to the pressing plate 2. That is to say, the linear motion of the power output end of the power device 3 can be converted into an arc-shaped motion that enables the pressing plate 2 to move along the sliding channel 1a. Therefore, the power device 3 can select conventional devices such as an oil cylinder 301 and a cylinder, reducing the requirements for the configuration of the power device 3.

[0048] As Figures 7 to 9 , Figure 11 and Figure 12 shown, a guide rod 6 is provided on the pressing plate 2, and a guide groove 301f is formed on the piston rod 301c of the power device 3. The guide groove 301f is in sliding fit with the guide rod 6. When the power output end of the power device 3 moves, the guide rod 6 is pushed by the inner wall of the guide groove 301f. The guide rod 6 transmits the acting force to the pressing plate 2, causing the pressing plate 2 to move along the sliding channel 1a in an arc-shaped motion. During the movement of the pressing plate 2, the orientation angle continuously changes, causing the guide rod 6 to move in the guide groove 301f, forming a linkage. Thus, the linear motion of the power output end of the power device 3 can be smoothly converted into an arc-shaped motion that enables the pressing plate 2 to move along the sliding channel 1a.

[0049] As Figures 7 to 9 , Figure 11 and Figure 12As shown, the power device 3 is an oil cylinder 301, and the oil cylinder 301 is composed of a cylinder body 301a, a cylinder head 301b and a piston rod 301c. The cylinder body 301a has a hollow inner cavity, and the cylinder head 301b is covered on the cylinder body 301a to close the inner cavity of the cylinder body 301a. The piston rod 301c is a power output end, which is slidably matched with the inner cavity of the cylinder body 301a, and extends outward through the cylinder head 301b and is connected to the pressure plate 2. It can be understood that the guide groove 301f is provided on the piston rod 301c, and the piston rod 301c is hinged to the pressure plate 2 through the guide rod 6. The cylinder body 301a is provided with a first oil filling port 301d and a second oil filling port 301e for pushing its power output end to move back and forth when oil is supplied. The first oil filling port 301d and the second oil filling port 301e are connected to the hydraulic oil input end through an oil supply pipeline. The piston rod 301c connects the cylinder body 301a The inner cavity is divided into a front cavity and a rear cavity, and the first oil filling port 301d and the second oil filling port 301e are connected to the front cavity and the rear cavity respectively. When the hydraulic oil is injected through the first oil filling port 301d, the piston rod 301c is pushed to move outside the cylinder body 301a under the action of oil pressure, and the corresponding piston rod 301c drives the pressure plate 2 to move along the sliding channel 1a to the external space. When the hydraulic oil is injected through the second oil filling port 301e, the piston rod 301c is pushed to retract into the cylinder body 301a, and the corresponding piston rod 301c drives the pressure plate 2 to retract along the sliding channel 1a to the clamp body 1. In the above arrangement, 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.

[0050] like Figure 7 , Figure 11 and Figure 12 As shown, a spring seat 7 is further provided in the installation cavity 102a, and the spring 5 is installed on the spring seat 7. The spring 5 is supported from below by the spring seat 7 so that the spring 5 is firmly held in the installation cavity 102a to avoid being separated from the installation cavity 102a.

[0051] like Figure 7 , Figure 8 , Figures 10 to 12 As shown, the clamp body 1 includes an upper shell 101 and a lower shell 102, and the upper shell 101 and the lower shell 102 are fixed by bolts 103. The sliding channel 1a includes an upper channel groove 101a and a lower channel groove 102d respectively opened on the upper shell 101 and the lower shell 102, and the installation cavity 102a is opened on the lower shell 102. The upper shell 101 and the lower shell 102 are opposite to each other at one side where the upper channel groove 101a and the lower channel groove 102d are opened, and are fixed by bolts 103. At this time, the upper channel groove 101a and the lower channel groove 102d remain opposite to each other and are connected, thereby forming the sliding channel 1a, and the installation cavity 102a can be connected with the sliding channel 1a accordingly.

[0052] Combined with Figures 1 to 12 , the mechanical self-locking mold clamping device of the present utility model is fixed on the fixed mold platen and the moving mold platen of the injection molding machine through the mold clamping device body 1. At the same time, the hydraulic oil input end is connected to the oil supply channel 102c communicated with the oil storage cavity on the mold clamping device body 1 through the oil supply pipeline, and is also connected to the first oil injection port 301d and the second oil injection port 301e 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, the hydraulic oil input end injects oil into the oil supply channel 102c. Under the action of the oil pressure, the locking plug 4 is pushed out of the sliding channel 1a, and the spring 5 is compressed, thereby releasing the blockage of the movement of the pressing plate 2. At the same time, the hydraulic oil input end first inputs hydraulic oil into the second oil injection port 301e of the oil cylinder 301, so that the piston rod 301c retracts, thereby driving the pressing plate 2 to move towards the inside of the mold clamping device body 1, ensuring that it completely retracts into the mold clamping device body 1, and making the step position between the pressing plate 2 and the outer wall of the mold clamping device body 1 disappear. At this time, the fixed mold and the moving mold of the mold can be respectively placed on the fixed mold platen and the moving mold platen. Then, the hydraulic oil input end inputs hydraulic oil into the first oil injection port 301d of the oil cylinder 301. Under the action of the oil pressure, the piston rod 301c as the power output end moves towards the outside of the cylinder body 301a, thereby driving the pressing plate 2 to move along the sliding channel 1a of the mold clamping device body 1 towards the external space. During the movement of the pressing plate 2, it gradually presses down, thereby forming a pressing force on the fixed mold and the moving mold on the fixed mold platen and the moving mold platen. During the reciprocating movement of the pressing plate 2, the guide rod 6 moves in the guide groove 301f of the piston rod 301c to form a linkage, so that the linear motion of the power output end of the power device 3 can be smoothly converted into an arc motion of the pressing plate 2 moving along the sliding channel 1a. After the pressing plate 2 moves to the external space in place, the fitting groove 201 reaches the relative position with the installation cavity 102a. At this time, the hydraulic oil in the oil storage tank 102b is emptied. As the oil pressure drops, the spring 5 returns to its deformed state and drives the locking plug 4 to move back into the sliding channel 1a and embed into the fitting groove 201 of the pressing plate 2, thereby restricting the movement of the pressing plate 2 and keeping it in a clamped state. If the hydraulic oil input end fails or the oil supply pipeline bursts, resulting in the loss of power of the power device 3, the mechanical self-locking structure composed of the locking plug 4 and the spring 5 can also be used to lock the pressing plate 2, preventing the pressing plate 2 from moving under the action of accidental forces.

[0053] The above embodiments and the descriptions in the specification only illustrate the principles and the best embodiments of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A mechanical self-locking mold clamp, characterized in that It includes a mold clamping device body (1), a pressure plate (2), a power device (3), a locking plug (4) and a spring (5). A sliding channel (1a) is formed in the mold clamping device body (1). The pressure plate (2) is slidably matched with the sliding channel (1a). The power device (3) is arranged on the mold clamping device body (1), and its power output end penetrates into the sliding channel (1a) to be connected with the pressure plate (2). An installation cavity (102a) is formed in the mold clamping device body (1). The installation cavity (102a) is communicated with the sliding channel (1a). The locking plug (4) and the spring (5) are both arranged in the installation cavity (102a), and the spring (5) is located at the lower end of the locking plug (4) and abuts against each other.

2. The mechanical self-locking mold clamping device according to claim 1, wherein, An oil storage groove (102b) is formed on the inner wall of the installation cavity (102a). The oil storage groove (102b) is close to the upper end of the locking plug (4), and the oil storage groove (102b) is communicated with an oil supply channel (102c).

3. The mechanical self-locking mold clamping device according to claim 2, wherein A fitting groove (201) is formed on the pressure plate (2). The locking plug (4) prevents the pressure plate (2) from moving by being embedded in the fitting groove (201).

4. A mechanical self-locking clamping die holder according to any one of claims 1 to 3, characterized in that, The outer shape of the pressure plate (2) is arc-shaped, and the sliding channel (1a) is an arc-shaped channel adapted to the pressure plate (2).

5. A mechanical self-locking clamping die holder according to claim 4, characterized in that, The power output end of the power device (3) is hinged to the pressure plate (2).

6. The mechanical self-locking mold clamping device according to claim 5, characterized in that, A guide rod (6) is arranged on the pressure plate (2). A guide groove (301f) is formed on the power output end of the power device (3). The guide groove (301f) is slidably matched with the guide rod (6).

7. A mechanical self-locking clamping die device according to claim 1, 2, 3, 5 or 6, characterized in that The power device (3) is an oil cylinder (301). The oil cylinder (301) includes a cylinder body (301a), a cylinder head (301b) and a piston rod (301c). The cylinder head (301b) covers the cylinder body (301a). The piston rod (301c) is slidably matched with the inner cavity of the cylinder body (301a), penetrates through the cylinder head (301b) and extends outwards, and is connected with the pressure plate (2). A first oil injection port (301d) and a second oil injection port (301e) for pushing its power output end to reciprocate during oil supply are formed on the cylinder body (301a).

8. A mechanical self-locking clamping die device according to claim 7, characterized in that, A spring seat (7) is further arranged in the installation cavity (102a). The spring (5) is installed on the spring seat (7).

9. The mechanical self-locking mold clamping device according to claim 8, wherein The mold clamping device body (1) includes an upper shell (101) and a lower shell (102). The upper shell (101) and the lower shell (102) are fixed by bolts (103). The sliding channel (1a) includes an upper channel groove (101a) and a lower channel groove (102d) respectively formed on the upper shell (101) and the lower shell (102). The installation cavity (102a) is formed on the lower shell (102).

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