Self-adaptive slow oil return jack oil pump

Abstract

The utility model discloses a self-adaption slow oil return jack oil pump which comprises a shell, a valve body, a pump core matched with the valve body and an oil cylinder with a piston rod assembly, the valve body is installed at the end of the shell, and an oil storage cavity of the shell is communicated with an oil outlet channel of the oil cylinder through an unloading loop. The universal joint component is arranged between the oil outlet passage and the oil cavity between the right end of the piston rod component and the inner cavity of the oil cylinder, and the steel ball is arranged between the universal joint component and the oil cavity between the right end of the piston rod component and the inner cavity of the oil cylinder; the inner wall of the oil outlet channel is sleeved with a throttling threaded sleeve, a throttling taper pin capable of moving up and down is arranged in the throttling threaded sleeve, and a throttling gap is formed in the space between the inner wall of the throttling threaded sleeve and the outer wall of the throttling taper pin. And a pressure spring is arranged at the upper end of the throttling taper pin. When the jack unloads, the throttling gap is automatically adjusted, and it is guaranteed that unloading is stable and unloading time is similar when the jack bears different loads.

Description

Technical Field

[0001] The utility model relates to an adaptive slow oil return jack oil pump, belonging to the technical field of jacks. Background Art

[0002] When the oil pump of the existing slow oil return product unloads, there is only one throttling state, and the throttling gap in this throttling state will not change. When the jack bears different loads, the descending speed during unloading will be different, and the difference in the descending speed between light load and heavy load unloading is relatively large, which greatly affects the experience of the jack. Summary of the Utility Model

[0003] In order to solve the above technical problems existing in the prior art, the utility model provides an adaptive slow oil return jack oil pump. When in the unloading state of bearing different loads, the throttling gap will automatically change according to the load size. When the load is large, the throttling gap is small; when the load is small, the throttling gap is large. Thus, when the jack bears different loads, the descending speed during unloading basically remains unchanged, achieving a comfortable experience for the jack.

[0004] The technical solution adopted by the utility model is as follows:

[0005] An adaptive slow oil return jack oil pump includes a housing, a valve body (1), a pump core cooperating with the valve body (1), and an oil cylinder (3) with a piston rod assembly (2). The valve body (1) is installed at the end of the housing. The front end of the pump core is inserted into the pump core installation cavity of the valve body (1) and is in sealed sliding connection therewith. The front end face of the pump core and the pump core installation cavity of the valve body form an oil cavity for filling hydraulic oil. The oil storage cavity (11) of the housing is communicated with the oil outlet passage of the oil cylinder (3) through an unloading circuit. It is characterized in that it further includes a universal joint component, a throttling taper pin, a throttling screw sleeve, and a steel ball, wherein:

[0006] The universal joint component (4) is arranged in the oil cavity between the oil outlet passage and the oil cavity between the right end of the piston rod component (2) and the inner cavity of the oil cylinder (3), and a steel ball (7) is arranged between the universal joint component (4) and the oil cavity between the right end of the piston rod component (2) and the inner cavity of the oil cylinder (3);

[0007] The inner wall of the oil outlet passage is sleeved with the throttling screw sleeve (6). The throttling screw sleeve (6) is provided with a throttling taper pin (5) that can move up and down. The space between the inner wall of the throttling screw sleeve (6) and the outer wall of the throttling taper pin (5) forms a throttling gap (14);

[0008] A compression spring is arranged at the upper end of the throttling taper pin. The lower end of the compression spring is in contact with the throttling taper pin, and the upper end is connected to the inner wall of the throttling screw sleeve.

[0009] Further, the universal joint component (4) includes a universal joint handle, a universal joint sleeve, and a universal shaft. One end of the universal shaft extends into the valve body (1) and contacts the steel ball, and the other end of the universal shaft is arranged in the universal joint sleeve and is used in cooperation with the universal joint handle; a U-shaped groove is formed at the upper end of the universal joint sleeve, and the universal joint handle is hinged in the U-shaped groove. By rotating the universal joint handle, the universal joint handle and the steel ball move together in the P direction.

[0010] Further, the upper end surface of the oil outlet passage is sealed and penetrates through the valve body (1), and a screw (9) is arranged on the upper end surface. A sealing ring (13) is arranged between the screw (9) and the valve body (1).

[0011] Further, the housing includes an outer sleeve (10) and a top cap. One end of the outer sleeve (10) is fixedly installed with the top cap, and the other end is fixedly installed with the valve body (1); the oil cylinder (3) is arranged in the inner cavity of the outer sleeve (10), and both ends of the oil cylinder (3) are fixedly connected to the valve body (1) and the top cap respectively, so that the telescopic end of the piston rod assembly (2) of the oil cylinder (3) is located outside the housing; the gap between the oil cylinder (3) and the outer sleeve (10) is an oil storage cavity (11).

[0012] Further, an O-shaped sealing ring (15) is arranged between the universal joint shaft and the valve body (1).

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. For the jack of the present utility model under various loads, the descending speed during unloading is close, so the use feeling is good.

[0015] 2. When the jack of the present utility model is unloaded, the throttling mechanism automatically adjusts the throttling gap according to the pressure of the hydraulic oil in the oil pump, ensuring the smooth unloading and similar unloading time of the jack under different loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the jack of the present utility model when bearing a small load.

[0017] Figure 2 is Figure 1 the top view (removing the universal joint component).

[0018] Figure 3 is a schematic diagram of the overall structure of the jack of the present utility model when bearing a large load.

[0019] Figure 4 is Figure 3 the top view (removing the universal joint component). DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will describe in detail the specific implementation manners of the embodiments of the present utility model in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described herein are only for explaining and illustrating the embodiments of the present utility model, and are not used to limit the embodiments of the present utility model.

[0021] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0022] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

[0023] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0024] In the present utility model, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model may be understood according to specific circumstances.

[0025] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0026] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0027] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments.

[0028] Reference Figures 1 to 4 , an adaptive slow oil return jack oil pump of the present utility model includes a housing, a valve body 1, a pump core cooperating with the valve body 1, and an oil cylinder 3 with a piston rod assembly 2. The valve body 1 is installed at the end of the housing. The front end of the pump core is inserted into the pump core installation cavity of the valve body 1 and is in sealed sliding connection therewith. The front end face of the pump core and the pump core installation cavity of the valve body form an oil cavity for filling hydraulic oil. The oil storage cavity 11 of the housing is communicated with the oil outlet passage of the oil cylinder 3 through a unloading circuit. It further includes a universal joint component, a throttle taper pin, a throttle sleeve, and a steel ball, wherein:

[0029] The universal joint component 4 is arranged in the oil cavity between the oil outlet passage and the oil cavity between the right end of the piston rod component 2 and the inner cavity of the oil cylinder 3, and a steel ball 7 is arranged between the universal joint component 4 and the oil cavity between the right end of the piston rod component 2 and the inner cavity of the oil cylinder 3;

[0030] The inner wall of the oil outlet passage is sleeved with the throttle sleeve 6. The throttle sleeve 6 is provided with a throttle taper pin 5 that can move up and down. The space between the inner wall of the throttle sleeve 6 and the outer wall of the throttle taper pin 5 forms a throttle gap 14;

[0031] A compression spring is arranged at the upper end of the throttle taper pin. The lower end of the compression spring is in contact with the throttle taper pin, and the upper end is connected to the inner wall of the throttle sleeve.

[0032] In one embodiment, the universal joint component 4 includes a universal joint handle, a universal joint sleeve and a universal shaft. One end of the universal shaft extends into the valve body 1 and is in contact with the steel ball. The other end of the universal shaft is arranged in the universal joint sleeve and is used in cooperation with the universal joint handle. A U-shaped groove is formed at the upper end of the universal joint sleeve, and the universal joint handle is hinged in the U-shaped groove. By rotating the universal joint handle, the universal joint handle and the steel ball move together in the P direction.

[0033] In one embodiment, the upper end surface of the oil outlet passage is sealed and penetrates through the valve body 1, and a screw 9 is arranged on the upper end surface. A sealing ring 13 is arranged between the screw 9 and the valve body 1.

[0034] In one embodiment, the housing includes an outer sleeve 10 and a top cap. One end of the outer sleeve 10 is fixedly installed with the top cap, and the other end is fixedly installed with the valve body 1. The oil cylinder 3 is arranged in the inner cavity of the outer sleeve 10, and both ends of the oil cylinder 3 are fixedly connected to the valve body 1 and the top cap respectively, so that the telescopic end of the piston rod assembly 2 of the oil cylinder 3 is located outside the housing. The gap between the oil cylinder 3 and the outer sleeve 10 is the oil storage cavity 11.

[0035] In one embodiment, an O-shaped sealing ring 15 is arranged between the universal joint shaft and the valve body 1.

[0036] The working principle of the present utility model is as follows:

[0037] 1. When the jack is unloaded or bears a small load, rotate the universal joint component. The steel ball under the universal joint component moves in the P direction together with the universal joint component under the action of oil pressure. At this time, the hydraulic oil in the space between the right end of the piston rod component and the inner cavity of the oil cylinder starts to flow along the direction of the arrow shown in the figure ( Figure 1 ). At this time, the pressure received by the lower end of the throttle taper pin is less than or slightly greater than the initial pressure of the compression spring. At this time, the throttling gap between the throttle taper pin and the throttle sleeve for the hydraulic oil to flow through is relatively large, and only a small throttling effect is exerted on the hydraulic oil. Moreover, the hydraulic oil pressure in the space between the right end of the piston rod component and the inner cavity of the oil cylinder is small, and the jack will descend relatively smoothly.

[0038] 2. When the jack bears a large load, rotate the universal joint component. The steel ball under the universal joint component moves in the P direction together with the universal joint component under the action of oil pressure. At this time, the hydraulic oil in the space between the right end of the piston rod component and the inner cavity of the oil cylinder starts to flow along the direction of the arrow shown in the figure ( Figure 3)Flow. At this time, the pressure of the hydraulic oil on the lower end of the throttle taper pin is much greater than the initial pressure of the compression spring. The throttle taper pin moves upward to a certain position where the pressure of the hydraulic oil on the lower end of the throttle taper pin is equal to the sum of the pressure of the compression spring and the pressure of the hydraulic oil at the upper end. At this time, the throttle gap between the throttle taper pin and the throttle sleeve through which the hydraulic oil flows becomes smaller, which has a great throttling effect on the hydraulic oil. At this time, the pressure of the hydraulic oil in the space between the right end of the piston rod assembly and the inner cavity of the oil cylinder is also very high, so the lowering speed of the jack is relatively stable. At this time, the overall lowering speed of the jack is close to the lowering speed when the jack bears a small load.

[0039] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. An adaptive slow return oil jack oil pump, comprising a housing, a valve body (1), a pump core matched with the valve body (1), and an oil cylinder (3) with a piston rod assembly (2), wherein the valve body (1) is mounted at the end of the housing, the front end of the pump core is inserted into the pump core installation cavity of the valve body (1) and is sealed and slidably connected thereto, the front end surface of the pump core and the pump core installation cavity of the valve body form an oil cavity for filling hydraulic oil; the oil storage cavity (11) of the housing is connected to the oil outlet passage of the oil cylinder (3) through a unloading circuit; characterized in that It also includes universal joint parts, throttling cone pins, throttling screw sleeves and steel balls, among which: The universal joint component (4) is arranged between the oil outlet passage and the oil cavity between the right end of the piston rod assembly (2) and the inner cavity of the oil cylinder (3), and the steel ball (7) is arranged between the universal joint component (4) and the oil cavity between the right end of the piston rod assembly (2) and the inner cavity of the oil cylinder (3); The throttling screw sleeve (6) is sleeved on the inner wall of the oil outlet passage, a throttling cone pin (5) movable up and down is arranged in the throttling screw sleeve (6), and a throttling gap (14) is formed between the inner wall of the throttling screw sleeve (6) and the outer wall of the throttling cone pin (5); A compression spring is arranged at the upper end of the throttling cone pin, the lower end of the compression spring is in contact with the throttling cone pin, and the upper end of the compression spring is connected to the inner wall of the throttling screw sleeve.

2. The adaptive slow return oil jack oil pump according to claim 1, characterized in that: The universal joint component (4) comprises a universal joint handle, a universal joint sleeve and a universal shaft. One end of the universal shaft extends into the valve body (1) and contacts the steel ball. The other end of the universal shaft is arranged in the universal joint sleeve and is used in conjunction with the universal joint handle. A U-shaped groove is formed at the upper end of the universal joint sleeve. The universal joint handle is hinged in the U-shaped groove. When the universal joint handle is rotated, the universal joint handle and the steel ball move together in the P direction.

3. The adaptive slow return oil jack oil pump according to claim 1, characterized in that: The upper end surface of the oil outlet passage is sealed and passes through the valve body (1), and a screw (9) is provided on the upper end surface, and a sealing ring (13) is provided between the screw (9) and the valve body (1).

4. The adaptive slow return oil jack oil pump according to claim 1, characterized in that: The outer shell comprises an outer sleeve (10) and a top cap, one end of the outer sleeve (10) is fixedly mounted with the top cap, and the other end is fixedly mounted with the valve body (1); the oil cylinder (3) is arranged in the inner cavity of the outer sleeve (10), and the two ends of the oil cylinder (3) are respectively fixedly connected to the valve body (1) and the top cap, so that the telescopic end of the piston rod assembly (2) of the oil cylinder (3) is located outside the outer shell; the gap between the oil cylinder (3) and the outer sleeve (10) is an oil storage cavity (11).

5. The adaptive slow return oil jack oil pump according to claim 2, characterized in that: An O-ring (15) is provided between the universal shaft and the valve body (1).

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