Clamping self-pressure-maintaining clamp

Abstract

A clamping self-pressure-maintaining clamp comprises an oil cylinder and a pressure maintaining valve, a gland is arranged at the top of the oil cylinder, a shaft rod is arranged on the oil cylinder, one end of the shaft rod is located in the oil cylinder, a first piston is arranged at the end of the shaft rod, the other end of the shaft rod extends out of the oil cylinder, and a sealing ring is arranged at the joint of the shaft rod and the oil cylinder. In conclusion, according to the clamping self-pressure-maintaining clamp, automatic one-key die clamping can be achieved, the stability of die clamping can be effectively guaranteed even if power and gas are cut off in the using process, the production efficiency is improved, and potential safety hazards are eliminated.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic clamps, and in particular relates to a clamping self-pressure-maintaining clamp. Background Art

[0002] When a hydraulic clamp clamps a workpiece, not only does it require a hydraulic cylinder to complete the clamping action, but the clamping force must also always remain constant. Otherwise, the workpiece will loosen due to changes in the clamping force during cutting, causing tool breakage and posing a hidden danger to quality and safety.

[0003] Common hydraulic pressure-holding devices use various pressure control valves to adjust the system's working pressure according to the system load size. The hydraulic self-pressure-holding clamp is suitable for the mold changing platform of the punch press, hydraulic injection molding machine, and die-casting machine. It is mainly used to clamp the mold and protect the internal pressure of the clamp for a long time. The principle of the pressure-holding clamp: the pre-pressed front shell assembly is placed between the upper and lower clamps of the existing pressure-holding clamp. A long-lasting fixed pressure is obtained by locking the upper and lower clamps. After a certain period of pressure holding, the structural adhesive between the face shell and TP is solidified to achieve the optimal bonding force and consistent height size. The current disadvantages of the pressure-holding clamp: it is easy to be damaged if used improperly, it is a wearing part, and its size is relatively large compared to traditional clamps. For this reason, we have proposed a hydraulic self-pressure-holding clamp. Utility Model Content

[0004] The utility model aims to provide a clamping self-pressure-maintaining clamp to solve the technical problems existing in the pressure-maintaining clamps in the prior art.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A clamping self-pressure-maintaining fixture comprises an oil cylinder and a pressure-maintaining valve. A pressure cover is arranged on the top of the oil cylinder, and an axle rod is arranged on the oil cylinder. One end of the axle rod is located in the oil cylinder, and a first piston is arranged at the end of the axle rod. The other end of the axle rod extends out of the oil cylinder, and a sealing ring is arranged at the connection between the axle rod and the oil cylinder; an oil inlet is arranged at the lower part of the oil cylinder, and the pressure-maintaining valve is installed at the oil inlet.

[0007] Furthermore, the pressure-maintaining valve includes a valve cover body and a pressure-maintaining valve body, a second piston is installed inside the valve cover body, a pressure relief rod is connected to the inside of the second piston, a pressure cap is provided on the outer peripheral sleeve of the pressure relief rod, a check seat is installed inside the pressure-maintaining valve body, a guide sleeve is provided on the outside of the check seat, a steel ball seat is provided between the guide sleeve and the pressure cap, a spring seat is provided at the bottom of the guide sleeve, an oil inlet and drain port is provided on the outer wall of the valve cover body, a pressure relief air inlet is provided on the outer wall of the pressure-maintaining valve body, an oil inlet channel is provided at the lower part of the pressure-maintaining valve body, and the oil inlet channel is connected to the oil inlet port.

[0008] Furthermore, the valve upper cover is detachably connected to the upper end of the pressure-maintaining valve body, and the size of the valve upper cover is matched with the size of the pressure-maintaining valve body.

[0009] Furthermore, the second piston is movably connected to the interior of the valve upper cover body, the second piston is disc-shaped, the size of the second piston is smaller than the size of the valve upper cover body, and the pressure relief rod is connected between the valve upper cover body and the pressure maintaining valve body.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model relates to a clamping self-pressure-maintaining fixture, which can realize automatic one-button clamping of the mold, and can effectively ensure the stability of the mold clamping even if the power and air are cut off during use, thereby improving production efficiency and eliminating safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0012] Figure 1 This is an axonometric diagram of a clamping self-pressure-maintaining fixture of the utility model;

[0013] Figure 2 It is a top view of a clamping self-pressure-maintaining clamp of the utility model;

[0014] Figure 3 for Figure 2 Sectional view at AA;

[0015] Figure 4 It is a cross-sectional view of the pressure-maintaining valve;

[0016] Figure 5 This is an exploded view of the pressure retaining valve. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] The present invention is further described in detail below in conjunction with the embodiments.

[0019] like Figure 1-5 As shown, a specific embodiment of a clamping self-pressure-maintaining clamp provided by the utility model is as follows:

[0020] A clamping self-pressure-maintaining fixture comprises an oil cylinder 1 and a pressure-maintaining valve 2. A pressure cover 3 is arranged on the top of the oil cylinder 1, and a shaft rod 4 is arranged on the oil cylinder 1. One end of the shaft rod 4 is located in the oil cylinder 1, and a first piston 5 is arranged at the end of the shaft rod 4. The other end of the shaft rod 4 extends out of the oil cylinder 1, and a sealing ring 6 is arranged at the connection between the shaft rod 4 and the oil cylinder 1; an oil inlet is arranged at the lower part of the oil cylinder 1, and the pressure-maintaining valve 2 is installed at the oil inlet.

[0021] The pressure-maintaining valve 2 comprises a valve upper cover 7 and a pressure-maintaining valve body 8. The valve upper cover 7 is detachably connected to the upper end of the pressure-maintaining valve body 8. The size of the valve upper cover 7 is adapted to the size of the pressure-maintaining valve body 8. A second piston 9 is arranged and installed inside the valve upper cover 7. A pressure relief rod 10 is connected through the inside of the second piston 9. A pressure cap 11 is sleeved on the outer periphery of the pressure relief rod 10. A check seat 12 is installed inside the pressure-maintaining valve body 8. A guide sleeve 13 is arranged on the outside of the check seat 12. A steel ball seat 14 is arranged between the guide sleeve 13 and the pressure cap 11. A spring seat 15 is arranged at the bottom of the guide sleeve 13. An oil inlet and drain port 16 is arranged on the outer wall of the valve upper cover 7. A pressure relief air inlet 17 is arranged on the outer wall of the pressure-maintaining valve body 8. An oil inlet channel 18 is arranged at the lower part of the pressure-maintaining valve body 8, and the oil inlet channel 18 is connected to the oil inlet.

[0022] The second piston 9 is movably connected to the interior of the valve upper cover body 7. The second piston 9 is disc-shaped. The size of the second piston 9 is smaller than that of the valve upper cover body 7. The pressure relief rod 10 is connected between the valve upper cover body 7 and the pressure maintaining valve body 8.

[0023] The size of the pressure relief rod 10 is smaller than that of the second piston 9, the pressure cap 11 is detachably connected to the bottom of the pressure relief rod 10, the size of the pressure cap 11 is larger than that of the pressure relief rod 10, the check seat 12 is installed below the pressure cap 11, the size of the check seat 12 is smaller than that of the pressure cap 11, the second piston 9 and the pressure relief rod 10 are both used for pressure relief, and the pressure relief capacity of the device can be greatly improved by the arrangement of the second piston 9 and the pressure relief rod 10.

[0024] The pressure cap 11 can fix the pressure relief rod 10 and the steel ball seat 14, and can also play a certain sealing role. The check seat 12 can be used for oil pressure inlet and outlet and sealing.

[0025] Furthermore, the steel ball seat 14 is movably connected to the bottom of the pressure cap 11, the size of the steel ball seat 14 is adapted to the size of the pressure cap 11, and the spring base 15 is detachably mounted on the bottom of the guide sleeve 13. The setting of the steel ball seat 14 can improve the ability of the device to seal oil pressure. The function of the steel ball seat 14 is to seal oil pressure. The setting of the spring base 15 can fix the spring and keep it stable during use. The setting of the guide sleeve 13 can install the check seat 12.

[0026] The working principle of the pressure maintaining valve 2 is as follows: the oil pressure of the pressure maintaining valve 2 enters from the entrance of the pressure relief air inlet 17, and flows out from the oil inlet and drain port 16 through the mechanical device of the check seat 12 and the steel ball seat 14, so as to achieve the mechanical pressure maintaining function of only entering but not exiting. When the pressure is released, the air pressure enters the oil inlet channel 18, and the check seat is opened by the pressure relief piston and the pressure relief rod 10, so that the oil circuit returns from the oil inlet and drain port 16 to the pressure relief air inlet 17.

[0027] The present embodiment relates to a clamping self-pressure-maintaining clamp, in which oil pressure enters the oil cylinder 1 and acts on the first piston 5, so that the oil cylinder 1 moves to clamp the mold; in normal use, the oil pressure only enters but does not exit, thereby achieving a non-pressure relief function. The device can effectively prevent safety hazards caused by sudden explosion and breakage during operation, reduce property losses, and protect personnel safety.

[0028] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0029] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clamping self-pressure retaining fixture, characterized in that: It includes an oil cylinder and a pressure-maintaining valve. A pressure cover is provided on the top of the oil cylinder. A shaft rod is provided on the oil cylinder. One end of the shaft rod is located in the oil cylinder. A first piston is provided at the end of the shaft rod. The other end of the shaft rod extends out of the oil cylinder. A sealing ring is provided at the connection between the shaft rod and the oil cylinder. An oil inlet is provided at the lower part of the oil cylinder, and the pressure-maintaining valve is installed at the oil inlet.

2. The clamping self-pressure-maintaining fixture according to claim 1, characterized in that: The pressure-maintaining valve comprises a valve upper cover body and a pressure-maintaining valve body, a second piston is arranged and installed inside the valve upper cover body, a pressure relief rod is connected through the inside of the second piston, a pressure cap is arranged on the outer peripheral sleeve of the pressure relief rod, a check seat is arranged inside the pressure-maintaining valve body, a guide sleeve is arranged on the outer side of the check seat, a steel ball seat is arranged between the guide sleeve and the pressure cap, a spring seat is arranged on the bottom of the guide sleeve, an oil inlet and drain port is arranged on the outer wall of the valve upper cover body, a pressure relief air inlet is arranged on the outer wall of the pressure-maintaining valve body, an oil inlet channel is arranged at the lower part of the pressure-maintaining valve body, and the oil inlet channel is connected with the oil inlet port.

3. The clamping self-pressure-maintaining fixture according to claim 2, characterized in that: The valve upper cover body is detachably connected to the upper end of the pressure-maintaining valve body, and the size of the valve upper cover body is matched with the size of the pressure-maintaining valve body.

4. The clamping self-pressure-maintaining fixture according to claim 3, characterized in that: The second piston is movably connected to the inside of the valve upper cover body. The second piston is disc-shaped. The size of the second piston is smaller than that of the valve upper cover body. The pressure relief rod is connected between the valve upper cover body and the pressure maintaining valve body.

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