Automatic pressure release valve and electric hydraulic tool

Abstract

The utility model belongs to the technical field of hydraulic tools, in particular to an automatic pressure release valve and an electric hydraulic tool, which comprise a valve body, an oil inlet hole and a mounting hole are axially arranged on the valve body, the left end of the oil inlet hole is closed, the right end of the oil inlet hole is open, the mounting hole comprises a small hole and a large hole which are coaxially arranged, the small hole is positioned on the left side of the large hole, and the large hole is positioned on the right side of the small hole. The small hole is communicated with the oil inlet hole through the oil passing hole, the large hole is connected with a lock cap provided with an oil return hole in the axial direction, a valve rod and an oil return spring are arranged in the large hole, the oil return spring enables the valve rod to block the small hole through elastic force, and an oil inlet and outlet hole communicated with the large hole is formed in the valve body. An oil return hole is formed in the valve body, the valve rod blocks the oil return hole, an oil outlet channel is formed in the valve body in the axial direction in a penetrating mode, a first one-way valve is arranged on the oil outlet channel, the right end face of the valve body is concaved inwards to form a groove, and the oil outlet channel and the right end of the oil inlet hole are both communicated with the groove. The oil feeding device is high in oil feeding speed, high in cutter feeding speed and high in working efficiency.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of hydraulic tools, and particularly relates to an automatic pressure relief valve and an electric hydraulic tool. BACKGROUND

[0002] The electric hydraulic tool has the advantages of rapidity, lightness and durability, and is widely welcomed by the market.

[0003] Chinese utility model patent (publication number CN205371736U, application date 2016.02.01, publication date 2016.07.06) discloses an automatic pressure relief valve, which comprises a valve body, an oil inlet hole with an open end at one end and a closed end at the other end is axially formed in the valve body, an installation hole one and an installation hole two which are parallel to and coaxial with the oil inlet hole are further formed in the valve body, the diameter of the installation hole one is smaller than that of the installation hole two, the installation hole one is close to the closed end of the oil inlet hole and is connected with the oil inlet hole through an oil passing hole, the installation hole two is connected with a lock cap which is axially provided with an oil return hole, the valve rod and the spring are arranged in the installation hole two, and the valve rod is blocked in the installation hole one under the elastic force of the spring, an oil outlet hole which is connected with the installation hole two is formed in the valve body, and the valve rod blocks the oil return hole when the hydraulic oil pressure in the installation hole one is greater than the elastic force of the spring. The lock cap has a spring seat which is axially protruded in the installation hole two, a plurality of through holes are uniformly formed in the circumferences of the spring seat, the valve rod is axially arranged through the spring seat, and one end of the spring is abutted on the spring seat, and the other end of the spring is abutted on the stop ring. In use, the hydraulic oil in the oil bag enters from the open end of the oil inlet hole, then flows through the oil passing hole into the installation hole one, the hydraulic oil pressure in the installation hole one is greater than the elastic force of the spring, the valve rod axially moves to block the oil return hole and make the installation hole one and the installation hole two connected, then the hydraulic oil enters the installation hole two, and then flows through the through hole and the oil outlet hole into the oil cylinder, and at this time, the oil inlet process is completed; when the hydraulic oil in the oil cylinder loses pressure, the elastic force of the spring makes the valve rod block the installation hole one again, the hydraulic oil in the oil cylinder flows through the oil outlet hole, the installation hole two, the through hole and the oil return hole in sequence, and then returns to the oil bag, and the oil discharge is fast.

[0004] The automatic pressure relief valve has the following defects: in use, the hydraulic oil enters the oil cylinder through the oil inlet hole, the installation hole one, the installation hole two, the through hole and the oil outlet hole, the route is tortuous, the oil inlet speed is slow, the tool feeding speed is slow, and the working efficiency is low. SUMMARY

[0005] The utility model discloses an automatic pressure relief valve and an electric hydraulic tool, which have the advantages of fast oil inlet speed, fast tool feeding speed and high working efficiency.

[0006] The utility model discloses an automatic pressure relief valve and an electric hydraulic tool, which have the advantages of fast oil inlet speed, fast tool feeding speed and high working efficiency.

[0007] The utility model discloses one of purposes is to provide an automatic pressure relief valve, including the valve body, the valve body is along the axial oil inlet hole and mounting hole are seted up, the oil inlet hole left end is closed, and the right end is open, the mounting hole includes coaxial arrangement's small hole and big hole, the small hole is located big hole left side, and the small hole is connected with the oil inlet hole by the oil hole, the big hole is connected with the axial locking cap that sets up the oil return hole, the big hole is equipped with the valve rod and the oil return spring of the elastic force that makes the valve rod block the small hole, the valve body is seted up with the oil inlet and outlet hole that big hole is linked together along the axial, when the hydraulic oil pressure in the small hole is greater than the elastic force of oil return spring, the valve rod will block the oil return hole, the valve body is seted up with the oil outlet channel along the axial, is equipped with check valve no. 1 on the oil outlet channel, the right end surface of valve body is concave and forms the recess, and the oil outlet channel and oil inlet hole right end all communicate recess.

[0008] In the above-mentioned electric hydraulic tool, the valve rod is circumferentially provided with a protruding blocking ring for blocking the small hole, the valve rod is partially located in the small hole, the locking cap has an axially protruding spring seat located in the big hole, the spring seat is circumferentially uniformly provided with a plurality of through holes, the valve rod axially penetrates the spring seat, and one end of the oil return spring abuts against the spring seat, and the other end of the oil return spring abuts against the blocking ring.

[0009] In the above-mentioned automatic pressure relief valve, the oil outlet channel includes a coaxially arranged assembly hole and an oil outlet hole, the assembly hole is located on the left side of the oil outlet hole, the check valve no. 1 is installed in the assembly hole, and the right end of the oil outlet hole is communicated with the recess.

[0010] In the above-mentioned automatic pressure relief valve, the check valve no. 1 includes a valve seat no. 1 installed in the assembly hole, a valve ball no. 1 arranged in the valve seat no. 1, and a reset spring no. 1 for blocking the oil outlet hole by the valve ball no. 1.

[0011] In the above-mentioned automatic pressure relief valve, the oil inlet hole and the small hole are blind holes.

[0012] In the above-mentioned automatic pressure relief valve, two counterbores are axially set up on the valve body, the number of the oil inlet and outlet holes is two and they are arranged in parallel, the oil inlet hole is arranged in the middle of the valve body, the two counterbores are respectively arranged on the two sides of the oil inlet hole, the oil outlet channel and the mounting hole are arranged on the two sides of the oil inlet hole, and the two oil inlet and outlet holes are respectively arranged on the two sides of the mounting hole.

[0013] The utility model discloses an electric hydraulic tool, including oil bag, cylinder body, pressurizing device and hydraulic working end, the cylinder body includes the cylinder barrel for sliding piston and the cylinder bottom for installing pressurizing device, and piston divides cylinder barrel into left chamber and right chamber, is equipped with piston rod on the piston, and the left end of piston rod projects cylinder barrel and connects hydraulic working end, the left end surface of cylinder bottom is concave and forms the installation groove for installing automatic pressure relief valve, and the left end of oil inlet and outlet hole and oil outlet channel intercommunication right chamber, be equipped with the liquid inlet passage of intercommunication oil bag and recess in the cylinder bottom, and pressurizing device press the liquid in oil bag into recess through liquid inlet passage, be equipped with check valve no.

[0014] In the electric hydraulic tool, the check valve no.

[0015] In the electric hydraulic tool, the oil return passage is a straight hole arranged along the axial direction of the cylinder bottom.

[0016] In the electric hydraulic tool, the left end axis of the liquid inlet passage is not on the same line with the right end axis of the oil outlet channel, and the left end axis of the liquid inlet passage is not on the same line with the right end axis of the oil inlet hole.

[0017] Compared with the prior art, the utility model has the advantages of:

[0018] 1. The oil outlet channel is arranged through the valve body along the axial direction, so that a part of the hydraulic oil can flow out directly through the oil outlet channel, the oil inlet speed is fast, the tool speed is fast, and the working efficiency is high.

[0019] 2. The oil outlet channel comprises an assembly hole and an oil outlet hole arranged coaxially, the assembly hole is located on the left side of the oil outlet hole, the check valve no.

[0020] 3. The oil return passage is a straight hole arranged along the axial direction of the cylinder bottom, and the oil return speed is fast. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the perspective view of the automatic pressure relief valve of the utility model;

[0022] Figure 2 is the right view of the automatic pressure relief valve of the utility model;

[0023] Figure 3 is Figure 2 is a sectional view along line A-A in

[0024] Figure 4 is a perspective view of the automatic pressure relief valve without a one-way valve I of the present application;

[0025] Figure 5 is a left view of the automatic pressure relief valve without a one-way valve I of the present application;

[0026] Figure 6 is a sectional view along line B-B in Figure 5

[0027] Figure 7 is a perspective view of the cylinder body of the present application Figure 1 ;

[0028] Figure 8 is a perspective view of the cylinder body of the present application Figure 2 ;

[0029] Figure 9 is a right view of the automatic pressure relief valve and the cylinder body of the present application;

[0030] Figure 10 is a sectional view along line C-C in Figure 9

[0031] Figure 11 is a sectional view along line D-D in Figure 9

[0032] Reference signs: 1, valve body; 2, oil inlet hole; 3, mounting hole; 3a, small hole; 3b, large hole; 4, oil passing hole; 5, oil return hole; 6, lock cap; 6a, spring seat; 6b, through hole; 7, valve rod; 7a, stop ring; 8, oil return spring; 9, oil inlet and outlet hole; 10, oil outlet passage; 10a, assembly hole; 10b, oil outlet hole; 11, one-way valve I; 11a, valve seat I; 11b, valve ball I; 11c, reset spring I; 12, groove; 13, counterbore; 14, cylinder body; 14a, cylinder barrel; 14b, cylinder bottom; 15, mounting groove; 16, liquid inlet passage; 17, oil return passage; 18, pressure relief passage. DETAILED DESCRIPTION

[0033] The present application will be further described in specific embodiments, with reference to Figure 1 —11

[0034] ​​​One objective of this utility model is to provide an automatic pressure relief valve, comprising a valve body 1. The valve body 1 has an oil inlet 2 and a mounting hole 3 axially formed on it. The oil inlet 2 is closed at its left end and open at its right end. The mounting hole 3 includes a small hole 3a and a large hole 3b coaxially arranged. The small hole 3a is located to the left of the large hole 3b and is connected to the oil inlet 2 via an oil passage 4. The large hole 3b is connected to a locking cap 6 with an axially formed return oil hole 5. A valve stem 7 is disposed within the large hole 3b. The valve stem 7 blocks the return oil spring 8 of the small hole 3a due to the elastic force. The valve body 1 is provided with an inlet and outlet oil hole 9 that is connected to the large hole 3b. When the hydraulic oil pressure in the small hole 3a is greater than the elastic force of the return oil spring 8, the valve stem 7 blocks the return oil hole 5. The valve body 1 is provided with an oil outlet channel 10 that runs through it along the axial direction. The oil outlet channel 10 is provided with a one-way valve 11. The right end face of the valve body 1 is recessed to form a groove 12. The right end of the oil outlet channel 10 and the oil inlet hole 2 are both connected to the groove 12.

[0035] Furthermore, the valve stem 7 has a protruding retaining ring 7a around its circumference for sealing the small hole 3a. The valve stem 7 is partially located in the small hole 3a. The locking cap 6 has a spring seat 6a located inside the large hole 3b and protruding axially. The spring seat 6a has several through holes 6b evenly distributed around its circumference. The valve stem 7 passes axially through the spring seat 6a, and one end of the return spring 8 abuts against the spring seat 6a. The other end of the return spring 8 abuts against the retaining ring 7a.

[0036] The working principle of this utility model is as follows: Figures 1-6 As shown, during operation, hydraulic oil enters the groove 12. The hydraulic oil pressure in the small hole 3a is greater than the elastic force of the return spring 8. The valve stem 7 blocks the return hole 5. The oil pressure causes the one-way valve 11 to open the oil outlet channel 10. Part of the hydraulic oil flows out through the inlet hole 2, the through hole 4, the small hole 3a, the inner cavity of the lock cap 6, the through hole 6b, the large hole 3b, and the inlet and outlet holes 9. The other part of the hydraulic oil flows out through the oil outlet channel 10. During oil return, the elastic force of the return spring 8 causes the valve stem 7 to block the small hole 3a, and the one-way valve 11 to block the oil outlet channel 10. The hydraulic oil returns through the inlet and outlet holes 9, the large hole 3b, the through hole 6b, the inner cavity of the lock cap 6, and the return hole 5.

[0037] This utility model provides an oil outlet channel 10 that runs through the valve body 1 along the axial direction, allowing a portion of the hydraulic oil to flow out directly through the oil outlet channel 10. This results in a fast oil inlet speed, which in turn leads to a fast feed rate and high working efficiency. At the same time, a one-way valve 11 is provided on the oil outlet channel 10 to effectively prevent the hydraulic oil from returning incorrectly.

[0038] The specific structure of the oil outlet channel 10 is as follows: Figures 1-5As shown, the oil outlet channel 10 includes coaxially arranged assembly hole 10a and oil outlet hole 10b, the assembly hole 10a is located at the left side of the oil outlet hole 10b, the one-way valve one 11 is installed in the assembly hole 10a, the right end of the oil outlet hole 10b is communicated with the groove 12.

[0039] The structure of the one-way valve one 11 is as shown in the figure, Figure 3 As shown, the one-way valve one 11 includes valve seat one 11a installed in the assembly hole 10a, valve ball one 11b arranged in the valve seat one 11a and reset spring one 11c for making the valve ball one 11b block the oil outlet hole 10b. Simple structure, easy to install.

[0040] Further, the oil inlet hole 2 and the small hole 3a are blind holes, the number of parts is small, and the assembly steps are reduced. At the same time, the oil inlet hole 2 has no other parts to block the oil inlet area, so the oil inlet speed is fast.

[0041] Further, the valve body 1 is provided with two counterbore holes 13 along the axial direction, the number of the oil inlet and outlet holes 9 is two and they are arranged in parallel, the oil inlet hole 2 is arranged in the middle of the valve body 1, the two counterbore holes 13 are respectively arranged at the two sides of the oil inlet hole 2, the oil outlet channel 10 and the mounting hole 3 are arranged at the two sides of the oil inlet hole 2, and the two oil inlet and outlet holes 9 are respectively arranged at the two sides of the mounting hole 3. The layout is reasonable and the space is reasonably utilized.

[0042] The mounting structure of the valve body 1: the rod part of the screw passes through the counterbore hole 13 and is screwed with the cylinder body 14.

[0043] Another object of the utility model is to provide an electric hydraulic tool, including oil bag, cylinder body 14, pressurizing device and hydraulic working end, the cylinder body 14 includes cylinder barrel 14a for sliding piston and cylinder bottom 14b for installing pressurizing device, piston separates cylinder barrel 14a into left chamber and right chamber, and piston rod is arranged on the piston, and the left end of piston rod extends out of cylinder barrel 14a and is connected with hydraulic working end, the left end surface of cylinder bottom 14b is concave and forms mounting groove 15 for installing automatic pressure relief valve, the left end of oil inlet and outlet hole 9 and oil outlet channel 10 is communicated with right chamber, liquid inlet passage 16 for communicating oil bag and groove 12 is arranged in cylinder bottom 14b, pressurizing device pressurizes liquid in oil bag and pressurizes into groove 12 through liquid inlet passage 16, one-way valve two is arranged on liquid inlet passage 16, and one-way valve two is located at the right side of pressurizing device, oil return passage 17 for communicating oil return hole 5 and oil bag is arranged in cylinder bottom 14b, pressure relief passage 18 for communicating groove 12 and oil bag is arranged in cylinder bottom 14b, and safety valve is arranged on pressure relief passage 18.

[0044] As shown in the figure, Figures 1-11As shown, when the pressurizing device is pressurized, the hydraulic oil in the oil bag enters the groove 12 through the liquid inlet passage 16, and then part of the hydraulic oil flows out into the right chamber through the oil inlet hole 2, the oil passing hole 4, the small hole 3a, the inner cavity of the cap 6, the through hole 6b, the large hole 3b, and the oil inlet and outlet hole 9, and the other part of the hydraulic oil flows out into the right chamber through the oil outlet passage 10; when the oil pressure of the right chamber reaches the set value, the hydraulic oil in the groove 12 enters the pressure relief passage 18 to open the safety valve, the pressurizing device stops working, the hydraulic oil returns to the oil bag through the pressure relief passage 18, and until the oil pressure of the right chamber is less than the set value, the safety valve is closed, and due to the pressure relief of the hydraulic oil in the groove 12, the hydraulic oil pressure in the small hole 3a is less than the elastic force of the oil return spring 8, the elastic force of the oil return spring 8 makes the valve rod 7 block the small hole 3a, and the hydraulic oil in the right chamber returns to the oil bag through the oil inlet and outlet hole 9, the large hole 3b, the through hole 6b, the inner cavity of the cap 6, the oil return hole 5, and the oil return passage 17.

[0045] The structure of the one-way valve two: the one-way valve two comprises a valve seat two installed in the liquid inlet passage 16, a valve ball two arranged in the valve seat two, and a reset spring two for making the valve ball two block the liquid inlet passage.

[0046] In order to quickly return oil, as shown, Figure 10 As shown, the oil return passage 17 is a straight hole arranged in the axial direction of the cylinder bottom 14b.

[0047] Further, the left end axis of the liquid inlet passage 16 and the right end axis of the oil outlet passage 10 are not on the same straight line, and the left end axis of the liquid inlet passage 16 and the right end axis of the oil inlet hole 2 are not on the same straight line.

[0048] The above embodiment is only one of the preferred embodiments of the present application, and does not limit the implementation range of the present application, so that: any equivalent changes made according to the shape, structure, principle of the present application should be covered within the protection scope of the present application.

Claims

1. An automatic pressure relief valve, comprising a valve body (1), wherein an oil inlet (2) and a mounting hole (3) are provided axially on the valve body (1), the oil inlet (2) being closed at the left end and open at the right end, the mounting hole (3) comprising a small hole (3a) and a large hole (3b) coaxially arranged, the small hole (3a) being located to the left of the large hole (3b), and the small hole (3a) being connected to the oil inlet (2) by an oil passage hole (4), the large hole (3b) being... A locking cap (6) with an axially opening return oil hole (5) is connected to the valve body (1). A valve stem (7) and a return oil spring (8) with elastic force causing the valve stem (7) to block the small hole (3a) are provided inside the large hole (3b). An inlet and outlet oil hole (9) communicating with the large hole (3b) is provided on the valve body (1). When the hydraulic oil pressure in the small hole (3a) is greater than the elastic force of the return oil spring (8), the valve stem (7) blocks the return oil hole (5). The valve body (1) is characterized by: The valve body (1) is provided with an oil outlet channel (10) running through it along the axial direction. A one-way valve (11) is provided on the oil outlet channel (10). The right end face of the valve body (1) is recessed to form a groove (12). The right end of the oil outlet channel (10) and the oil inlet hole (2) are both connected to the groove (12).

2. An automatic pressure relief valve according to claim 1, characterized in that: The oil outlet channel (10) includes a coaxially arranged assembly hole (10a) and an oil outlet hole (10b). The assembly hole (10a) is located to the left of the oil outlet hole (10b). The one-way valve (11) is installed in the assembly hole (10a). The right end of the oil outlet hole (10b) is connected to the groove (12).

3. An automatic pressure relief valve according to claim 2, characterized in that: The one-way valve (11) includes a valve seat (11a) installed in the assembly hole (10a), a valve ball (11b) disposed in the valve seat (11a), and a return spring (11c) that springs to block the oil outlet hole (10b).

4. An automatic pressure relief valve according to claim 1, characterized in that: The oil inlet (2) and the small hole (3a) are blind holes.

5. An automatic pressure relief valve according to claim 1, characterized in that: The valve body (1) has two countersunk holes (13) along the axial direction. There are two oil inlet and outlet holes (9) arranged in parallel. The oil inlet hole (2) is located in the middle of the valve body (1). The two countersunk holes (13) are located on both sides of the oil inlet hole (2). The oil outlet channel (10) and the mounting hole (3) are located on both sides of the oil inlet hole (2). The two oil inlet and outlet holes (9) are located on both sides of the mounting hole (3).

6. An electro-hydraulic tool comprising the automatic pressure relief valve according to any one of claims 1-5, characterized in that: The device includes an oil bladder, a cylinder body (14), a pressurizing device, and a hydraulic working end. The cylinder body (14) includes a cylinder barrel (14a) for sliding a piston and a cylinder bottom (14b) for mounting the pressurizing device. The piston divides the cylinder barrel (14a) into a left chamber and a right chamber. A piston rod is provided on the piston, and the left end of the piston rod extends out of the cylinder barrel (14a) and connects to the hydraulic working end. The left end face of the cylinder bottom (14b) is recessed to form a mounting groove (15) for mounting the automatic pressure relief valve. The left end of the oil inlet / outlet port (9) and the oil outlet channel (10) are connected to the right chamber. The cylinder bottom (14b) is provided with a liquid inlet passage (16) that connects the oil bladder and the groove (12). The pressurizing device presses the liquid in the oil bladder into the groove (12) through the liquid inlet passage (16). The liquid inlet passage (16) is provided with a one-way valve II, which is located on the right side of the pressurizing device. The cylinder bottom (14b) is provided with a return oil passage (17) that connects the return oil hole (5) and the oil bladder. The cylinder bottom (14b) is provided with a pressure relief passage (18) that connects the groove (12) and the oil bladder. The pressure relief passage (18) is provided with a safety valve.

7. An electric hydraulic tool according to claim 6, characterized in that: The oil return passage (17) is a straight through hole arranged axially along the bottom of the cylinder (14b).

8. An electric hydraulic tool according to claim 6, characterized in that: The left end axis of the liquid inlet passage (16) and the right end axis of the oil outlet passage (10) are not on the same straight line, and the left end axis of the liquid inlet passage (16) and the right end axis of the oil inlet hole (2) are not on the same straight line.

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