Oil drain valve block of hydraulic jack

Abstract

The utility model discloses an oil drain valve block of a hydraulic jack, which is used for being installed on a jack base, an oil drain channel and an oil return channel are arranged in the jack base, the oil drain valve block comprises a valve block body and an oil drain screw, and the valve block body is detachably installed on the jack base. An adjusting cavity, an oil inlet channel and an oil outlet channel are formed in the valve block body, the oil inlet channel and the oil outlet channel are communicated with the adjusting cavity, the oil inlet channel is communicated with the oil drainage channel, the oil outlet channel is communicated with the oil return channel, a screw hole communicated with the adjusting cavity is formed in the side portion of the valve block body, and the oil drainage screw is in threaded connection with the screw hole and is adjusted to make axial displacement. And the oil inlet channel and the oil outlet channel are connected or disconnected. The hydraulic jack not only solves the problem that the whole jack is scrapped due to the fact that an oil drainage screw of an existing jack is damaged, but also solves the problem that the oil drainage screw of the existing jack is too low, the oil drainage screw sinks into the ground after a base sinks in the process of using the jack, and pressure relief cannot be carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of jacks, in particular to an oil drain valve block of a hydraulic jack. Background Art

[0002] A hydraulic jack is a jack that uses a plunger or hydraulic cylinder as a rigid lifting member. It has the characteristics of compact structure, stable operation, large lifting force, and self-locking. The hydraulic jack has a strong lifting capacity, and the heavy-duty hydraulic jack has a lifting force of more than 100t. The working principle of the hydraulic jack is to use oil as the working medium, transmit motion through changes in sealed volume, and transmit power through the internal pressure of the oil. The hydraulic transmission device is essentially an energy conversion device.

[0003] At present, the quality of welded vertical jacks is better than that of threaded vertical jacks. Welded jacks are widely used by the majority of users. However, since the oil drain valve of the welded jack is located at the bottom of the jack base, the oil drain screw will be damaged during use, and the jack will be unusable as a whole, resulting in scrapping and economic losses to users. And because the oil drain valve is located at the bottom of the jack base, the jack is prone to sinking during use, causing the oil drain valve to sink into the ground and unable to release pressure, resulting in the inability of the lifted heavy object to return to its original position, causing great inconvenience to customers and greater economic losses. Utility Model Content

[0004] The utility model aims to provide an oil drain valve block for a hydraulic jack. The utility model not only solves the problem that the existing jack's oil drain screw is damaged and causes the jack to be scrapped as a whole, but also solves the problem that the existing jack's oil drain screw is too low, and when the base sinks during the use of the jack, the oil drain screw sinks into the ground, resulting in failure to release pressure.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an oil drain valve block of a hydraulic jack is used to be installed on a jack base, an oil drain channel and an oil return channel are provided in the jack base, the valve block body is detachably installed on the jack base, an adjusting chamber and an oil inlet channel and an oil outlet channel connected to the adjusting chamber are provided in the valve block body, the oil inlet channel is connected to the oil drain channel, the oil outlet channel is connected to the oil return channel, a screw hole connected to the adjusting chamber is opened on the side of the valve block body, the oil drain screw is threadedly connected to the screw hole, the oil drain screw is adjusted to cause its axial displacement, so as to realize the conduction or closing of the oil inlet channel and the oil outlet channel.

[0006] By adopting the above technical scheme, the part where the original jack base is connected to the oil drain screw is designed to be a detachable structure, that is, the part is set as the valve block body, and the valve block body is provided with a screw hole for connecting the oil drain screw. At the same time, an oil inlet channel and an oil outlet channel are arranged inside for communicating with the oil drain channel and the oil return channel respectively. When the oil drain screw is damaged, it is only necessary to disassemble the pressure relief valve block for replacement, thereby solving the problem that the existing jack oil drain screw is damaged and the jack is scrapped as a whole. At the same time, the oil drain valve block is arranged on the upper part of the jack base, which raises the installation height of the oil drain screw, thereby solving the problem that the existing jack oil drain screw is too low, and the oil drain screw sinks into the ground after the base sinks during the use of the jack, resulting in the inability to release pressure, thereby avoiding causing significant economic losses to users.

[0007] The utility model is further configured to include a ball, which is movably arranged in the adjusting cavity, the diameter of the ball is smaller than the inner diameter of the adjusting cavity, and the diameter of the ball is larger than the inner diameter of the oil inlet channel. When the oil drain screw moves inward, the oil drain screw pushes the ball to move toward the oil inlet channel.

[0008] By adopting the above technical solution, a ball is used instead of the oil drain screw to directly block the oil inlet channel, thereby achieving a better flow-stopping effect.

[0009] The utility model is further configured that an optical axis portion is provided at the inner end of the oil drain screw, the optical axis portion extends into the adjustment cavity, and the outer periphery of the optical axis portion is tightly fitted with the inner periphery of the adjustment cavity.

[0010] By adopting the above technical solution, it is not only easy to install but also has better sealing performance.

[0011] The utility model is further configured that a lever is radially arranged at the outer end of the oil drain screw.

[0012] By adopting the above technical solution, it is more convenient for users to rotate the oil drain screw, and the operation is easier.

[0013] The utility model is further configured such that a first lower hole connected to the oil drain channel and a second lower hole connected to the oil return channel are vertically extended at the upper end of the jack base, a first upper hole connected to the oil inlet channel and a second upper hole connected to the oil outlet channel are provided at the lower end of the valve block body, the first lower hole is butt-connected with the first upper hole, and the second lower hole is butt-connected with the second upper hole.

[0014] By adopting the above technical solution, the conduction between the oil inlet channel and the oil drain channel and the conduction between the oil outlet channel and the oil return channel can be achieved. The structure is simple and reliable and the processing is very convenient.

[0015] The utility model is further configured such that the lower end of the valve block body is provided with a first sealing groove coaxial with the first upper hole and a second sealing groove coaxial with the second upper hole, and the first sealing groove and the second sealing groove are respectively provided with a first sealing ring and a second sealing ring for forming a sealing fit with the upper surface of the jack base.

[0016] By adopting the above technical solution, the sealing performance between the valve block body and the jack base can be improved, thereby preventing the oil in the internal flow channel from leaking from the gap between the valve block body and the jack base.

[0017] The utility model is further configured that the valve block body is mounted on the jack base through a plurality of connecting screws.

[0018] By adopting the above technical solution, the connection structure is simple and reliable, and disassembly and assembly are very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model in cooperation with the jack base;

[0020] Figure 2 for Figure 1 A top view of the structure;

[0021] Figure 3 for Figure 2 AA section view;

[0022] Figure 4 This is a schematic diagram of the bottom structure of the valve block body of the utility model;

[0023] Figure 5 It is a side view of the utility model;

[0024] Figure 6 for Figure 5 BB cross-sectional view.

[0025] In the figure: 1. jack base; 2. oil drain channel; 3. oil return channel; 4. valve block body; 5. oil drain screw; 6. adjusting chamber; 7. oil inlet channel; 8. oil outlet channel; 9. screw hole; 10. ball; 11. optical axis; 12. lever; 13. first lower hole; 14. second lower hole; 15. first upper hole; 16. second upper hole; 17. first sealing groove; 18. second sealing groove; 19. first sealing ring; 20. second sealing ring; 21. connecting screw. DETAILED DESCRIPTION

[0026] 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.

[0027] Example: As shown in the attached Figures 1 to 6 The oil drain valve block of the hydraulic jack shown is used to be installed on the jack base 1. The jack base 1 is provided with an oil drain channel 2 and an oil return channel 3. The oil drain channel 2 is led out from the inner oil tank of the jack, and the oil return channel 3 is connected to the outer oil tank of the jack. The oil drain valve block includes a valve block body 4 and an oil drain screw 5. The valve block body 4 is forged or fine-drawn square steel using a forging die and is formed in one step using advanced equipment. The valve block body 4 is detachably installed on the jack base 1. The valve block body 4 is provided with an adjusting chamber 6 and an oil inlet channel 7 and an oil outlet channel 8 connected to the adjusting chamber 6. The adjusting chamber 6 is cylindrical in shape. The oil inlet channel 7 is connected to the oil drain channel 2, and the oil outlet channel 8 is connected to the oil return channel 3. A screw hole 9 connected to the adjusting chamber 6 is opened on the side of the valve block body 4. The oil drain screw 5 is threadedly connected to the screw hole 9. The oil drain screw 5 is adjusted to cause its axial displacement to realize the conduction or closing of the oil inlet channel 7 and the oil outlet channel 8. The part where the original jack base 1 is connected to the oil discharge screw is designed to be a detachable structure, that is, the part is set as a valve block body 4, and a screw hole 9 is opened on the valve block body 4 for connecting the oil discharge screw 5. At the same time, an oil inlet channel 7 and an oil outlet channel 8 are arranged inside to communicate with the oil discharge channel 2 and the oil return channel 3 respectively. When the oil discharge screw 5 is damaged, it is only necessary to disassemble the pressure relief valve block for replacement, which solves the problem that the existing jack oil discharge screw is damaged and causes the jack to be scrapped as a whole. At the same time, the oil discharge valve block is arranged on the upper part of the jack base 1, which raises the installation height of the oil discharge screw 5, and solves the problem that the existing jack oil discharge screw is too low. After the base sinks during the use of the jack, the oil discharge screw sinks into the ground, resulting in the inability to discharge pressure, thereby avoiding causing significant economic losses to users.

[0028] As attached Figure 6 As shown, a ball 10 is also included, and the ball 10 is movably arranged in the adjusting chamber 6. The diameter of the ball 10 is smaller than the inner diameter of the adjusting chamber 6, and the diameter of the ball 10 is larger than the inner diameter of the oil inlet passage 7. When the oil drain screw 5 moves inward, the oil drain screw 5 pushes the ball 10 to move toward the oil inlet passage 7. The ball 10 is used to replace the oil drain screw 5 to directly block the oil inlet passage 7, and the flow stopping effect is better.

[0029] As attached Figure 6As shown, the inner end of the oil drain screw 5 is provided with an optical axis portion 11, the optical axis portion 11 extends into the adjustment cavity 6, and the outer periphery of the optical axis portion 11 is tightly fitted with the inner periphery of the adjustment cavity 6. This design is not only convenient for installation, but also has better sealing performance.

[0030] As attached Figure 6 As shown, the outer end of the oil drain screw 5 is provided with a lever 12 in the radial direction, and the lever 12 can be an integrated structure with the oil drain screw 5, or a through hole can be provided in the radial direction on the oil drain screw 5, and the lever 12 passes through the through hole, and the two can be interference fit or welded together. Providing the lever 12 at the outer end of the oil drain screw 5 makes it easier for the user to rotate the oil drain screw 5, and the operation is easier.

[0031] As attached Figure 3 As shown, the upper end of the jack base 1 is vertically extended with a first lower hole 13 connected to the oil drain channel 2 and a second lower hole 14 connected to the oil return channel 3, and the lower end of the valve block body 4 is provided with a first upper hole 15 connected to the oil inlet channel 7 and a second upper hole 16 connected to the oil outlet channel 8, the first lower hole 13 is connected to the first upper hole 15, and the second lower hole 14 is connected to the second upper hole 16. This design can realize the conduction between the oil inlet channel 7 and the oil drain channel 2 and the conduction between the oil outlet channel 8 and the oil return channel 3, and the structure is simple and reliable, and the processing is very convenient.

[0032] As attached Figure 3 As shown, the lower end of the valve block body 4 is provided with a first sealing groove 17 coaxial with the first upper hole 15 and a second sealing groove 18 coaxial with the second upper hole 16, and the first sealing groove 17 and the second sealing groove 18 are respectively provided with a first sealing ring 19 and a second sealing ring 20 for forming a sealing match with the upper surface of the jack base 1. This design can improve the sealing performance between the valve block body 4 and the jack base 1, and prevent the oil in the internal flow channel from leaking from the gap between the valve block body 4 and the jack base 1.

[0033] As attached Figure 1 As shown, the valve block body 4 is mounted on the jack base 1 through a plurality of connecting screws 21, the connecting screws 21 are mounted from top to bottom, the valve block body 4 is provided with through holes for the connecting screws 21 to pass through, and the jack base 1 is provided with threaded through holes for the connecting screws 21 to pass through. The connection structure of this design is simple and reliable, and it is very convenient to disassemble and assemble.

Claims

1. An oil drain valve block for a hydraulic jack, for installation on a jack base (1), wherein the jack base (1) is provided with an oil drain channel (2) and an oil return channel (3), characterized in that: The invention comprises a valve block body (4) and an oil drain screw (5), wherein the valve block body (4) is detachably mounted on a jack base (1), wherein an adjusting chamber (6) and an oil inlet channel (7) and an oil outlet channel (8) connected to the adjusting chamber (6) are arranged in the valve block body (4), wherein the oil inlet channel (7) is connected to the oil drain channel (2), and the oil outlet channel (8) is connected to the oil return channel (3), wherein a screw hole (9) connected to the adjusting chamber (6) is opened on the side of the valve block body (4), and the oil drain screw (5) is threadedly connected to the screw hole (9), and the oil drain screw (5) is adjusted to cause its axial displacement, thereby realizing the connection or closing of the oil inlet channel (7) and the oil outlet channel (8).

2. The oil drain valve block of the hydraulic jack according to claim 1, characterized in that: The invention also comprises a ball (10), wherein the ball (10) is movably arranged in the regulating cavity (6), the diameter of the ball (10) is smaller than the inner diameter of the regulating cavity (6), and the diameter of the ball (10) is larger than the inner diameter of the oil inlet passage (7), and when the oil drain screw (5) moves inward, the oil drain screw (5) pushes the ball (10) to move toward the direction of the oil inlet passage (7).

3. The oil drain valve block of the hydraulic jack according to claim 1, characterized in that: An optical axis portion (11) is provided at the inner end of the oil drain screw (5), the optical axis portion (11) extends into the adjustment cavity (6), and the outer periphery of the optical axis portion (11) is tightly fitted with the inner periphery of the adjustment cavity (6).

4. The oil drain valve block of the hydraulic jack according to claim 1, characterized in that: A lever (12) is radially arranged at the outer end of the oil drain screw (5).

5. The oil drain valve block of the hydraulic jack according to claim 1, characterized in that: The upper end of the jack base (1) is provided with a first lower hole (13) connected to the oil drain channel (2) and a second lower hole (14) connected to the oil return channel (3) along a vertical extension, and the lower end of the valve block body (4) is provided with a first upper hole (15) connected to the oil inlet channel (7) and a second upper hole (16) connected to the oil outlet channel (8), the first lower hole (13) is connected to the first upper hole (15) in a butt connection, and the second lower hole (14) is connected to the second upper hole (16) in a butt connection.

6. The oil drain valve block of the hydraulic jack according to claim 5, characterized in that: The lower end of the valve block body (4) is provided with a first sealing groove (17) coaxial with the first upper hole (15) and a second sealing groove (18) coaxial with the second upper hole (16); the first sealing groove (17) and the second sealing groove (18) are respectively provided with a first sealing ring (19) and a second sealing ring (20) for forming a sealing fit with the upper surface of the jack base (1).

7. The oil drain valve block of the hydraulic jack according to claim 1, characterized in that: The valve block body (4) is mounted on the jack base (1) via a plurality of connecting screws (21).

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