Hydraulic tong cylinder assembly

Abstract

The utility model provides a kind of hydraulic tong oil cylinder assembly, including cylinder body, oil bladder and pumping device, oil bladder is installed in the rear end of cylinder body, the front end of cylinder body has piston cavity, power piston is provided in piston cavity;Piston cavity is communicated with oil bladder by being set in the oil inlet channel and oil return channel of cylinder body same;Pumping device is used to pump hydraulic oil from oil bladder into piston cavity along oil inlet channel;Cylinder body is provided with pressure regulating chamber being communicated with oil return channel, pressure regulating valve is installed in pressure regulating chamber, and pressure regulating valve is used to control the opening and closing of oil return channel according to the oil pressure of oil return channel;Its characteristics are, cylinder body is also provided with pressure relief chamber for being communicated with pressure regulating chamber and oil inlet channel to form pressure relief channel;Pressure relief valve is installed in pressure relief chamber, and pressure relief valve is used to control the opening and closing of pressure relief channel according to the pressure difference of oil inlet channel and pressure regulating chamber.The utility model can speed up the needle reset of pressure regulating valve, so that electric hydraulic tong can work normally and continuously.

Description

Technical Field

[0001] This utility model relates to hydraulic clamp accessories, and in particular, to a hydraulic clamp cylinder assembly. Background Technology

[0002] Electric hydraulic pliers offer significant convenience for electrical system installation and maintenance due to their small size, light weight (one-handed operation), high output force, and built-in battery. Currently available electric hydraulic pliers typically feature a pressure regulating valve. During oil return, the hydraulic oil must first lift the valve's pin to open the return oil path, allowing the cylinder piston to reset. However, actual testing has shown that after the pin is lifted, relying solely on the pressure regulating spring's thrust often results in a slow reset, requiring the power piston to fully retract. When the electric hydraulic pliers are in continuous operation, waiting for the power piston to fully retract leads to decreased work efficiency. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a hydraulic clamp cylinder assembly that can accelerate the reset of the pressure regulating valve pin, so that the electric hydraulic clamp can work normally and continuously.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A hydraulic clamp cylinder assembly includes a cylinder body, an oil bladder, and a pumping device. The oil bladder is installed at the rear end of the cylinder body, and the front end of the cylinder body has a piston chamber containing a power piston. The piston chamber and the oil bladder are connected via an inlet channel and a return channel located on the same side of the cylinder body. The pumping device pumps hydraulic oil from the oil bladder into the piston chamber along the inlet channel. The cylinder body has a pressure regulating chamber connected to the return channel, and a pressure regulating valve is installed in the pressure regulating chamber. The pressure regulating valve controls the opening and closing of the return channel based on the oil pressure. The cylinder body also has a pressure relief chamber connecting the pressure regulating chamber and the inlet channel to form a pressure relief channel. A pressure relief valve is installed in the pressure relief chamber, and the pressure relief valve controls the opening and closing of the pressure relief channel based on the pressure difference between the inlet channel and the pressure regulating chamber.

[0005] Preferably, the pressure relief valve adopts a one-way valve structure, and the pressure relief valve opens when the pressure difference between the oil inlet channel and the pressure regulating chamber reaches a preset value.

[0006] Preferably, the pressure regulating valve includes a pressure regulating piston, a valve seat, a ejector pin, a pressure regulating cap, and a pressure regulating spring; the pressure regulating cap is threadedly connected to the upper end of the pressure regulating chamber; the ejector pin is movably inserted through the pressure regulating cap; the pressure regulating piston is located below the pressure regulating cap, and a gap is left between the pressure regulating piston and the inner wall of the pressure regulating chamber, dividing the pressure regulating chamber into a first upper chamber and a first lower chamber; one end of the pressure regulating spring abuts against the pressure regulating cap, and the other end abuts against the pressure regulating piston; the valve seat is installed at the lower end of the first lower chamber, and the valve seat has a pressure regulating hole.

[0007] Preferably, the pressure relief chamber is penetrated by the oil inlet channel.

[0008] Preferably, the pressure relief chamber is connected to the first lower chamber.

[0009] Preferably, the valve seat divides the first lower chamber into an upper chamber and a lower chamber, and an oil passage connecting the upper chamber and the lower chamber is provided between the valve seat and the side wall of the first lower chamber; the pressure relief chamber is connected to the lower chamber.

[0010] Preferably, the oil return channel includes channel one, channel two and channel three. One end of channel one is connected to the piston chamber and the other end is connected to the lower end of the pressure regulating chamber. One end of channel two is connected to the first upper chamber and the other end is connected to the oil bladder. One end of channel three is connected to the first lower chamber and the other end is connected to the oil bladder.

[0011] Preferably, the pressure relief chamber includes a second upper chamber and a second lower chamber, the inner diameter of the second lower chamber being smaller than that of the second upper chamber; the oil inlet channel is connected to the second upper chamber; the pressure relief valve includes a steel ball, a pressure relief spring, and a valve block; the valve block is threadedly connected to the opening of the pressure relief chamber; the steel ball is located at the lower end of the second upper chamber, one end of the pressure relief spring abuts against the valve block, and the other end abuts against the steel ball.

[0012] Preferably, the cylinder block is provided with a plunger chamber communicating with the oil inlet channel; The oil pumping device includes a plunger assembly and a drive motor. The drive motor is installed on the outside of the cylinder block. The plunger assembly is installed inside the plunger cavity. The drive motor is connected to the plunger assembly to drive the plunger assembly to work, thereby pumping hydraulic oil into the piston cavity.

[0013] Preferably, a first check valve is installed at the connection between the oil inlet channel and the piston chamber; a second check valve is installed at the connection between the oil inlet channel and the oil sac.

[0014] The main technical effects of this utility model are reflected in the following aspects: By installing a pressure relief valve between the oil inlet channel and the pressure regulating chamber, and opening the pressure relief valve when the oil inlet channel is in the oil supply state (the oil pressure is lower than that of the pressure regulating chamber), the hydraulic oil below the pressure regulating chamber can enter the oil inlet channel through the pressure relief chamber; thus enabling the electric hydraulic clamp to continue working without needing to be fully reset. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall hydraulic clamp cylinder assembly in the embodiment; Figure 2 This is a cross-sectional view of the hydraulic clamp cylinder assembly in the embodiment; Figure 3This is a schematic diagram showing the connection between the pressure relief chamber and the pressure regulating chamber in the embodiment; Figure 4 This is an exploded schematic diagram of the pressure regulating valve in the embodiment; Figure 5 This is a schematic diagram showing the connection between the pressure regulating chamber and the oil return channel in the embodiment.

[0016] Reference numerals: 1. Cylinder block; 11. Oil inlet channel; 121. Channel 1; 122. Channel 2; 123. Channel 3; 13. Plunger chamber; 14. Pressure regulating chamber; 151. Second upper chamber; 152. Second lower chamber; 2. Oil bladder; 3. Drive motor; 4. Bracket; 5. Pressure regulating valve; 51. Pressure regulating cap; 52. Pin; 53. Pressure regulating piston; 54. Valve seat; 541. Pressure regulating hole; 542. Flat surface; 55. Pressure regulating spring; 56. Upper sealing ring; 57. Lower sealing ring; 58. Sealing gasket; 61. Valve block; 62. Pressure relief spring; 63. Steel ball; 6. Pressure relief valve; 7. Power piston; 8. Second check valve; 9. First check valve; 10. Plunger assembly. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0018] like Figure 1-2 The hydraulic clamp cylinder assembly shown includes a cylinder body 1, an oil bladder 2, and an oil pumping device. The oil bladder 2 is installed at the rear end of the cylinder body 1, and the front end of the cylinder body 1 has a piston chamber, in which a power piston 7 is disposed. The piston chamber and the oil bladder 2 are connected through an oil inlet channel 11 and an oil return channel disposed in the same part of the cylinder body 1.

[0019] A first check valve 9 is installed at the connection between the oil inlet channel 11 and the piston chamber; a second check valve 8 is installed at the connection between the oil inlet channel 11 and the oil sac 2. In this way, the hydraulic oil can circulate in a predetermined direction.

[0020] The oil pumping device is used to pump hydraulic oil from the oil sac 2 into the piston chamber through the oil inlet channel 11. Specifically, the oil pumping device includes a plunger assembly 10 and a drive motor 3. The drive motor 3 is mounted on the outside of the cylinder body 1 via a bracket 4. The cylinder body 1 is provided with a plunger chamber 13 communicating with the oil inlet channel 11. The plunger assembly 10 is installed in the plunger chamber 13. The drive motor 3 is connected to the plunger assembly 10 to drive the plunger assembly 10 to work, thereby pumping hydraulic oil into the piston chamber. The working principle of the oil pumping device is prior art and will not be described in detail in this embodiment.

[0021] like Figure 3-4 As shown, the cylinder body 1 is provided with a pressure regulating chamber 14 that communicates with the oil return channel. A pressure regulating valve 5 is installed in the pressure regulating chamber 14. The pressure regulating valve 5 is used to control the opening and closing of the oil return channel according to the oil pressure of the oil return channel.

[0022] The pressure regulating valve 5 includes a pressure regulating piston 53, a valve seat 54, a ejector pin 52, a pressure regulating cap 51, and a pressure regulating spring 55. The pressure regulating cap 51 is threadedly connected to the upper end of the pressure regulating chamber 14. The ejector pin 52 is movably inserted through the pressure regulating cap 51. The pressure regulating piston 53 is located below the pressure regulating cap 51 and is fixedly sleeved with the ejector pin 52. A gap is left between the pressure regulating piston 53 and the inner wall of the pressure regulating chamber 14, dividing the pressure regulating chamber 14 into a first upper chamber and a first lower chamber. One end of the pressure regulating spring 55 abuts against the pressure regulating cap 51, and the other end abuts against the pressure regulating piston 53.

[0023] An upper sealing ring 56 is provided between the pressure regulating cap 51 and the pressure regulating spring 55, and a lower sealing ring 57 is provided between the pressure regulating cap 51 and the side wall of the pressure regulating chamber 14 to achieve a better sealing effect.

[0024] The valve seat 54 is installed at the lower end of the first lower chamber via a threaded connection. A sealing gasket 58 is provided at the bottom of the valve seat 54 to achieve a good sealing effect. The valve seat 54 has a pressure regulating hole 541. The valve seat 54 divides the first lower chamber into an upper chamber and a lower chamber, and an oil passage connecting the upper and lower chambers is provided between the valve seat 54 and the side wall of the first lower chamber. Specifically, at least one straight surface 542 is provided on the side of the valve seat 54, and an oil passage is formed between this straight surface 542 and the side wall of the first lower chamber.

[0025] like Figure 5 As shown, the oil return channel includes channel 121, channel 22 and channel 323. One end of channel 121 is connected to the piston chamber and the other end is connected to the lower end of the pressure regulating chamber 14. One end of channel 22 is connected to the first upper chamber and the other end is connected to the oil sac 2. One end of channel 3123 is connected to the first lower chamber and the other end is connected to the oil sac 2.

[0026] When the power piston 7 retracts, the ejector pin 52 is pushed open, the pressure regulating port 541 opens, and hydraulic oil enters the pressure regulating chamber 14, then returns to the oil bladder 2 through the return oil channel. Afterwards, the ejector pin 52 gradually descends under the pushing action of the pressure regulating spring 55, and the hydraulic oil in the first lower chamber flows back to the oil bladder 2, finally closing the pressure regulating port 541. When the oil pumping device operates, hydraulic oil enters the piston chamber, propelling the power piston 7 forward.

[0027] The cylinder block 1 is also provided with a pressure relief chamber for connecting the pressure regulating chamber 14 and the oil inlet channel 11 to form a pressure relief channel. The pressure relief chamber includes a second upper chamber 151 and a second lower chamber 152. The inner diameter of the second lower chamber 152 is smaller than that of the second upper chamber 151. The second upper chamber 151 is penetrated by the oil inlet channel 11, that is, the oil inlet channel 11 is connected to the second upper chamber 151. The second lower chamber 152 is connected to the upper chamber or the lower chamber, as shown in the figure, which is connected to the lower chamber.

[0028] A pressure relief valve 6 is installed inside the pressure relief chamber, and the pressure relief valve 6 preferably adopts a one-way valve structure. The pressure relief valve 6 includes a steel ball 63, a pressure relief spring 62, and a valve block 61; the valve block 61 is threadedly connected to the opening of the pressure relief chamber; the steel ball 63 is located at the lower end of the second upper chamber 151, and one end of the pressure relief spring 62 abuts against the valve block 61, and the other end abuts against the steel ball 63. When the oil pumping device is working, hydraulic oil enters the piston chamber from the oil inlet channel 11. At this time, the pressure difference between the oil pressure in the oil inlet channel 11 and the first lower chamber reaches a preset value (depending on the pressure relief spring 62), the steel ball 63 is pushed up, that is, the pressure relief valve 6 opens, and the hydraulic oil in the first lower chamber enters the oil inlet channel 11 through the pressure relief chamber, thereby enabling the oil in the first lower chamber to be discharged quickly.

[0029] Of course, the above are just typical examples of this utility model. In addition, this utility model may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A hydraulic clamp cylinder assembly, comprising a cylinder body (1), an oil bladder (2), and a pumping device, wherein the oil bladder (2) is installed at the rear end of the cylinder body (1), and the front end of the cylinder body (1) has a piston chamber, wherein a power piston (7) is disposed in the piston chamber; the piston chamber and the oil bladder (2) are connected through an oil inlet channel (11) and a return channel disposed in the same part of the cylinder body (1); the pumping device is used to pump hydraulic oil from the oil bladder (2) into the piston chamber along the oil inlet channel (11); the cylinder body (1) is provided with a pressure regulating chamber (14) connected to the return channel, wherein a pressure regulating valve (5) is installed in the pressure regulating chamber (14), and the pressure regulating valve (5) is used to control the opening and closing of the return channel according to the oil pressure of the return channel; characterized in that, The cylinder body (1) is also provided with a pressure relief chamber for connecting the pressure regulating chamber (14) and the oil inlet channel (11) to form a pressure relief channel; a pressure relief valve (6) is installed in the pressure relief chamber, and the pressure relief valve (6) is used to control the opening and closing of the pressure relief channel according to the pressure difference between the oil inlet channel (11) and the pressure regulating chamber (14).

2. The hydraulic clamp cylinder assembly according to claim 1, characterized in that, The pressure relief valve (6) adopts a one-way valve structure. When the pressure difference between the oil inlet channel (11) and the pressure regulating chamber (14) reaches a preset value, the pressure relief valve (6) opens.

3. The hydraulic clamp cylinder assembly according to claim 1, characterized in that, The pressure regulating valve (5) includes a pressure regulating piston (53), a valve seat (54), a pin (52), a pressure regulating cap (51), and a pressure regulating spring (55); the pressure regulating cap (51) is threaded to the upper end of the pressure regulating chamber (14); the pin (52) is movably inserted through the pressure regulating cap (51); the pressure regulating piston (53) is located below the pressure regulating cap (51), and there is a gap between the pressure regulating piston (53) and the inner wall of the pressure regulating chamber (14), dividing the pressure regulating chamber (14) into a first upper chamber and a first lower chamber; one end of the pressure regulating spring (55) abuts against the pressure regulating cap (51), and the other end abuts against the pressure regulating piston (53); the valve seat (54) is installed at the lower end of the first lower chamber, and the valve seat (54) has a pressure regulating hole (541).

4. The hydraulic clamp cylinder assembly according to claim 1, characterized in that, The pressure relief chamber is penetrated by the oil inlet channel (11).

5. The hydraulic clamp cylinder assembly according to claim 3, characterized in that, The pressure relief chamber is connected to the first lower chamber.

6. The hydraulic clamp cylinder assembly according to claim 5, characterized in that, The valve seat (54) divides the first lower chamber into an upper chamber and a lower chamber. An oil passage connecting the upper chamber and the lower chamber is provided between the valve seat (54) and the side wall of the first lower chamber. The pressure relief chamber is connected to the lower chamber.

7. The hydraulic clamp cylinder assembly according to claim 3, characterized in that, The return oil passage includes passage one (121), passage two (122) and passage three (123). One end of passage one (121) is connected to the piston chamber and the other end is connected to the lower end of the pressure regulating chamber (14). One end of passage two (122) is connected to the first upper chamber and the other end is connected to the oil sac (2). One end of passage three (123) is connected to the first lower chamber and the other end is connected to the oil sac (2).

8. The hydraulic clamp cylinder assembly according to any one of claims 1-7, characterized in that, The pressure relief chamber includes a second upper chamber (151) and a second lower chamber (152), the inner diameter of the second lower chamber (152) being smaller than that of the second upper chamber (151); the oil inlet channel (11) is connected to the second upper chamber (151); the pressure relief valve (6) includes a steel ball (63), a pressure relief spring (62), and a valve block (61); the valve block (61) is threadedly connected to the opening of the pressure relief chamber; the steel ball (63) is located at the lower end of the second upper chamber (151), one end of the pressure relief spring (62) abuts against the valve block (61), and the other end abuts against the steel ball (63).

9. The hydraulic clamp cylinder assembly according to claim 1, characterized in that, The cylinder body (1) is provided with a plunger cavity (13) that communicates with the oil inlet channel (11); The oil pumping device includes a plunger assembly (10) and a drive motor (3). The drive motor (3) is installed on the outside of the cylinder (1). The plunger assembly (10) is installed in the plunger cavity (13). The drive motor (3) is connected to the plunger assembly (10) to drive the plunger assembly (10) to work, thereby pumping hydraulic oil into the piston cavity.

10. The hydraulic clamp cylinder assembly according to claim 1, characterized in that, A first check valve (9) is installed at the connection between the oil inlet channel (11) and the piston chamber; a second check valve (8) is installed at the connection between the oil inlet channel (11) and the oil sac (2).

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