Portable pressure relief mechanism of light hydraulic jack

Abstract

The utility model relates to a lifting tool, and aims to provide a portable pressure relief mechanism for a light hydraulic jack, which has the characteristics of rapidness and convenience in operation, safety and reliability. According to the technical scheme, the portable pressure relief mechanism of the light hydraulic jack comprises a pressing hand rotationally positioned on a base and driven by a handle, and an oil drain valve installed on the base. The oil drain valve is characterized in that an oil drain valve rod in the oil drain valve is vertically arranged on the base, a rotatable oil drain valve rotating piece is correspondingly arranged at the top end of the oil drain valve rod, an oil drain valve plate is fixed to the front end of the pressing handle through a rotatable rotating shaft, and the oil drain valve plate exerts pressure on the oil drain valve rod through the oil drain valve rotating piece to drive the oil drain valve rod.

Description

Technical Field

[0001] The utility model relates to a lifting tool, in particular to a portable pressure relief mechanism for a light hydraulic jack. Background Art

[0002] The handle of a conventional light hydraulic jack is used to start the oil pump (pumping oil by moving it up and down to drive the oil pump for oil pumping operation), so that the lifting component can lift a heavy object upward for jacking movement; it is also used to start the oil circuit release device (starting the oil drain valve with the handle), so that the lifting component can slowly descend to complete the jacking operation. Since the oil drain valve is separately designed on the base under the push button, when draining oil, the handle needs to be taken out of the push button, and then the push button needs to be manually rotated forward separately to release the oil drain valve; when locking the oil drain valve, the oil drain valve needs to be rotated backward; at the same time, in order to operate the oil drain valve, the handle and the push button cannot be fixedly connected, and the operation is very inconvenient; in addition, the handle and the jack are constantly connected and separated, and the handle is also easy to lose. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies in the above background art and provide a portable pressure relief mechanism for a light hydraulic jack, which should have the characteristics of quick and convenient operation, safety and reliability.

[0004] The technical solution provided by the utility model is: a portable pressure relief mechanism for a light hydraulic jack, including a push button rotatably positioned on the base and driven by a handle, and an oil drain valve installed on the base; characterized in that: the oil drain valve rod in the oil drain valve is vertically arranged on the base, and a rotatable oil drain valve rotating plate is correspondingly arranged at the top of the oil drain valve rod, the front end of the push button is fixed with an oil drain valve plate through a rotatable rotating shaft, and the oil drain valve plate presses and drives the oil drain valve rod through the oil drain valve rotating plate.

[0005] The rotating shaft is positioned at the front part of the push button and is coaxially arranged with the axis of the handle; the handle is rotatably positioned in the insertion port at the rear end of the push button and is inserted and fitted with the rotating shaft at the front end, so as to realize the rotational drive of the rotating shaft.

[0006] A circumferentially surrounding positioning groove is formed at the front part of the handle, and a fixing bolt matched with the positioning groove is arranged on the push button, so that the handle and the push button can be kept connected while driving the rotating shaft.

[0007] The oil drain valve rotating plate is rotatably positioned on the base through a horizontally arranged rotating shaft, and the axis of the rotating shaft is perpendicular to the axis of the first hinge pin; the push button is rotatably positioned on the base through the first hinge pin.

[0008] The oil drain valve rotating plate is provided with an arm cooperating with the oil drain valve plate and an arm cooperating with the oil drain valve rod; the angle between the two arms is less than or equal to 90 degrees.

[0009] A retraction spring is provided for the steel ball in the oil drain valve to push the steel ball to automatically close the oil drain passage after the oil drain valve rotating piece is separated from the oil drain valve rod.

[0010] The oil drain valve rod is in sliding fit with the oil drain valve body; and the top of the oil drain valve rod also extends vertically upward and exposes outside the oil drain valve body to cooperate with the oil drain valve rotating piece.

[0011] The beneficial effects of the present utility model are as follows:

[0012] 1. During the pressure relief operation, only by rotating the handle can the oil drain valve be released, so as to perform the pressure relief operation.

[0013] 2. The handle is always fixed on the press handle to ensure that it will not be lost.

[0014] 3. A steel ball pressed by a spring is provided in the oil drain valve, so it can be automatically locked without manual operation.

[0015] 4. The operation is fast, convenient, safe and reliable. Description of the Drawings

[0016] Figure 1 is a three-dimensional structural schematic diagram of an embodiment of the present utility model.

[0017] Figure 2 is a front view structural schematic diagram of an embodiment of the present utility model.

[0018] Figure 3 is Figure 2 the enlarged cross-sectional structural schematic diagram taken along the A-A direction in

[0019] Figure 4 is a three-dimensional schematic diagram of the oil drain and pressure relief structure of the existing hydraulic jack.

[0020] Figure 5 is one of the three-dimensional structural schematic diagrams of the existing hydraulic jack (the state where the handle is connected to the press handle).

[0021] Figure 6 is the second three-dimensional structural schematic diagram of the existing hydraulic jack (the state where the handle is separated from the press handle).

[0022] Reference numerals in the drawings: wheel 1, tray 2, lifting arm 3, wall panel 4, handle 5, press handle 6, first hinge pin 6.1, second hinge pin 6.2, oil pump pump core 7, oil drain valve 8, oil drain valve rod 9, oil drain valve rotating piece 10, oil drain valve plate 11, rotating shaft 12, retaining ring groove 12.1, fixing bolt 13, rotating shaft 14, low-pressure oil passage 15, high-pressure oil passage 16, screw 17, return spring 18, steel ball 19. Detailed Embodiments

[0023] The following is further described in conjunction with the embodiments shown in the accompanying drawings.

[0024] Figure 5 The shown light hydraulic jack includes a base composed of a wall panel 4 and equipped with a lifting assembly (the lifting assembly includes a lifting arm 3 rotatably hinged to the wall panel and having a tray 2 at its top) and wheels 1, an oil pump assembly installed on the base and including an oil cylinder and an oil pump, a press handle 6 rotatably positioned on the base through a first hinge pin 6.1 and hinged to the top end of the oil pump core 7 through a second hinge pin 6.2 (the axis of the first hinge pin is parallel to the axis of the second hinge pin), a handle 5 in plug-in cooperation with the press handle and driving the movement of the oil pump core 7, and an oil drain valve 8 installed on the base and driven by the press handle; the above is the structure of a conventional light hydraulic jack.

[0025] As Figures 4 - 6 shown: In the existing oil drain and pressure relief structure of the hydraulic jack, the oil drain valve is located outside the pump core and is arranged staggeredly left and right (shown in the figure: the oil drain valve is set on the left and the pump core is set on the right); the thread connection between the oil drain valve rod and the oil drain valve body, and the oil drain valve rod is also inclined outward so that the flat head at one end of the handle can be engaged with the groove at the top end of the oil drain valve rod and rotated to drive the opening or closing operation of the oil drain valve.

[0026] Due to the many deficiencies in the above oil drain and pressure relief structure, the present utility model is improved as follows (see Figures 1 - 3 ):

[0027] First, the oil drain valve is moved inwards by a certain distance, from the original position outside the pump core (moved parallel to the axis of the handle) to the inside of the pump core and located between the horizontal projections of the first hinge pin 6.1 and the second hinge pin 6.2; the oil drain valve is vertically arranged, and the thread fit between the oil drain valve rod and the oil drain valve body is changed to a sliding (sliding along the axis of the oil drain valve rod) fit; and the top of the oil drain valve rod also extends vertically upwards and exposes outside the oil drain valve body.

[0028] Second, a shaft hole is made in the front part of the press handle ( Figure 2 the left side), and a rotating shaft 12 is rotatably arranged in the shaft hole; the axis of the rotating shaft is coaxial with the axis of the handle (the handle after being inserted and fitted with the press handle), and the front end of the handle and one end of the rotating shaft are rotationally driven through a mortise and tenon structure that can be inserted and fitted with each other; a circumferentially surrounding positioning groove is provided in the front part of the handle, and a fixing bolt 13 cooperating with the positioning groove is provided on the press handle, so that the handle can rotate relative to the press handle to drive the rotating shaft, but cannot move relative to the press handle to ensure the connection between the handle and the rotating shaft. A drain valve plate (the drain valve plate is located directly above the drain valve rod) is also fixed on the rotating shaft, and the drain valve plate is located at the inner end of the shaft sleeve and can prevent the rotating shaft from moving outwards (i.e., Figure 2The outer circumferential surface of the left end of the shaft is provided with a retaining ring groove 12.1 and a spring retaining ring (omitted in the figure) is inserted, and the spring retaining ring is located at the outer end of the sleeve, thereby preventing the shaft from moving inward (i.e. Figure 2 to the right of ).

[0029] Third, an oil drain valve rotor 10 is installed below the rotating shaft through a horizontally arranged rotating shaft 14; the rotating shaft is rotatably installed on the base and the axis of the rotating shaft is perpendicular to the axis of the first hinge pin 6.1, and the oil drain valve rotor is fixed on the rotating shaft.

[0030] The drain valve rotating plate is located below the drain valve plate and has two swing arms (the angles of the two swing arms are preferably 80-90 degrees), one of which extends upward to cooperate with the drain valve plate, and the other extends horizontally ( Figure 3 When the oil drain valve plate rotates, it can push one swing arm of the oil drain valve rotating piece to synchronously drive the other swing arm to press the top of the oil drain valve stem, thereby starting the oil drain operation;

[0031] Fourth, a steel ball 19 is provided at the bottom end of the oil drain valve stem (the steel ball is located in the valve port connected to the high-pressure oil channel 16 in the oil drain valve); a return spring 18 is provided in the valve port, and the lower end of the steel ball is pressed by the return spring and has the potential energy to move upward.

[0032] The working principle of the utility model is:

[0033] When it is necessary to drain the oil and release the pressure, just turn the handle clockwise to drive the drain valve rotor on the shaft to rotate counterclockwise. A swing arm of the drain valve rotor presses the drain valve stem downward, thereby opening the oil drain circuit. The pressure oil in the high-pressure oil channel 16 then enters the low-pressure oil channel 15 through the valve port and returns to the oil storage chamber.

[0034] When you stop draining oil or finish draining oil, just turn the handle counterclockwise and the swing arm of the drain valve rotor will disengage from the drain valve stem. The external force on the drain valve stem will be eliminated, and the return spring will push the steel ball upward and lock the valve port. The high-pressure oil channel and the low-pressure oil channel will be cut off immediately, and the drain valve will be closed.

[0035] It should be noted that the above structure can also be designed as follows: turn the handle counterclockwise to release the oil and release the pressure, and turn the handle clockwise to close the drain valve. This only requires mirroring the drain valve to the right side of the pump core, and mirroring the drain valve plate and the drain valve rotating piece; these changes are obviously easy for those skilled in the art.

Claims

1. A light hydraulic jack portable pressure release mechanism, comprising a handle (6) rotatably positioned on a base and driven by a handle (5), and an oil release valve (8) mounted on the base; characterized in that: The oil drain valve stem (9) in the oil drain valve is arranged vertically on the base and a rotatable oil drain valve rotating plate (10) is correspondingly arranged at the top end of the oil drain valve stem. The front end of the pressing handle is fixed to the oil drain valve plate (11) via a rotatable rotating shaft (12) and the oil drain valve plate applies pressure to drive the oil drain valve stem via the oil drain valve rotating plate.

2. The portable pressure release mechanism of the light hydraulic jack according to claim 1 is characterized in that: The rotating shaft is positioned at the front of the snap handle and is coaxially arranged with the handle axis; the handle is rotatably positioned in the socket at the rear end of the snap handle and the front end is plug-fitted with the rotating shaft, thereby realizing the rotation drive of the rotating shaft.

3. The portable pressure release mechanism of the light hydraulic jack according to claim 2 is characterized in that: A circumferential positioning groove is provided at the front of the handle, and a fixing bolt (13) matching with the positioning groove is arranged on the press handle, so that the handle and the press handle are connected and the rotating shaft can be driven at the same time.

4. The portable pressure release mechanism for a light hydraulic jack according to claim 3 is characterized in that: The oil drain valve rotating plate is rotatably positioned on the base via a horizontally arranged rotating shaft (14), wherein the axis of the rotating shaft is perpendicular to the axis of the first hinge pin (6.1); the push handle (6) is rotatably positioned on the base via the first hinge pin (6.1).

5. The portable pressure release mechanism for a light hydraulic jack according to claim 4, characterized in that: The oil drain valve rotating plate is provided with a swing arm cooperating with the oil drain valve plate and a swing arm cooperating with the oil drain valve stem; the angle between the two swing arms is less than or equal to 90 degrees.

6. The portable pressure release mechanism for a light hydraulic jack according to claim 5, characterized in that: The steel ball in the oil discharge valve is equipped with a retraction spring (18) so as to push the steel ball to automatically close the oil discharge passage after the oil discharge valve rotating piece is separated from the oil discharge valve stem.

7. The portable pressure release mechanism of the light hydraulic jack according to claim 6, characterized in that: The drain valve stem and the drain valve body are in sliding cooperation; and the top of the drain valve stem also extends vertically upward and is exposed outside the drain valve body so as to cooperate with the drain valve rotating piece.

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