Valve body pulling device

Abstract

The utility model belongs to the field of pump valve pulling tools, and particularly relates to a valve body pulling device. The valve body pulling device comprises a jack and further comprises a lifting support, the lower end of the lifting support is provided with a connecting piece used for being connected with a valve body, and the upper end of the lifting support is provided with a cross beam for the jack to abut upwards and a lifting mechanism for adjusting lifting of the cross beam. When the valve body pulling-out device works, the jack abuts against the cross beam to pull out the valve body outwards by a certain distance, then the height of the cross beam is reduced through the lifting mechanism, and the jack abuts against the cross beam upwards again to pull out the valve body outwards by a larger distance again. In this way, the valve body at a deep position can be taken out through multiple abutting actions of the lifting mechanism and the jack.

Description

Technical Field

[0001] The utility model belongs to the field of pump valve removal tools, and in particular relates to a valve body extraction device. Background Art

[0002] In the process of oilfield water injection development, plunger pumps are usually used as the main water injection equipment. During the reciprocating operation of the plunger pump, the plunger pump's liquid inlet valve, liquid outlet valve, valve spring, valve seat seal and other parts are prone to wear and rust, so the valve body needs to be taken out frequently for maintenance. However, these parts are set in the inner cavity of the pump head, and the operating space is small, so special removal tools are needed to take out the valve body.

[0003] The Chinese utility model patent with the authorization announcement date of April 20, 2016 and the authorization announcement number CN105166814U discloses a plunger pump valve puller, which includes a pull rod, on which an impact retaining ring and a limit retaining ring are installed, and an impact hammer is installed between the impact retaining ring and the limit retaining ring. When in use, the lower end of the pull rod is threadedly connected to the valve stem of the pump valve, and the impact force of the impact hammer is used to drive the pull rod to safely and quickly remove the pump valve. The problems of this removal tool when in use are: first, the reciprocating up and down movement of the impact hammer by a person holding the impact hammer to hit the retaining ring is an arc movement, which cannot ensure that the valve body is vertically force-extracted. Second, the impact of the handheld impact hammer on the retaining ring is easy to cause injuries to the hands and wrists. Third, the impact force of the impact hammer on the retaining ring is an impact force, which is easy to cause deformation and damage to the threaded part connected to the valve body.

[0004] The Chinese invention patent with an application publication date of March 03, 2023 and an application publication number of CN115723092A discloses a tool and method for removing the valve seat of the hydraulic end of a plunger pump. The removal tool includes a pull rod and a hollow jack. The pull rod includes a frustum section, a straight rod and a threaded section. The frustum section cooperates with the claws on the pull rod to clamp the valve seat. The pull rod is passed through the vertical channel of the hollow jack piston, and then the pull rod is fixed on the upper end surface of the piston by the cooperation of the nut and the threaded section. When working, the pull rod is first connected to the valve body, and the hollow jack is placed on the plane of the pump head body of the hydraulic end of the plunger pump. Then, the valve seat and the valve seat sealing ring are removed by the push-up action of the hollow jack. This device can well solve the problems of the above-mentioned impact hammer removal tool, such as not being subjected to vertical force during removal, and the impact force during removal easily causing deformation and damage to the valve body components.

[0005] In many pump equipment, there are some valve bodies located deeper in the pump body cavity, but the stroke height of the hollow jack is limited. The tool for removing the valve seat of the hydraulic end of the plunger pump mentioned above cannot smoothly remove the valve body located deeper from the inner cavity of the pump head. Utility Model Content

[0006] The purpose of the present utility model is to provide a valve body extraction device to solve the problem that existing tools cannot extract a valve body at a relatively deep position from the inner cavity of a pump head.

[0007] To achieve the above object, the technical solution adopted by the present utility model is as follows:

[0008] A valve body extraction device includes a jack and also includes a lifting bracket. A connecting member for connecting with the valve body is provided at the lower end of the lifting bracket, and a cross beam for the jack to abut upward and a lifting mechanism for adjusting the lifting of the cross beam are provided at the upper end of the lifting bracket.

[0009] The present utility model belongs to an improved invention. During operation, the valve body is pulled outwards by a certain distance by the jack abutting against the cross beam, and then the height of the cross beam is reduced by the lifting mechanism. By performing the upward abutting action of the jack again, the valve body can be pulled outwards by a greater distance. In this way, the valve body at a relatively deep position can be taken out through multiple abutting actions of the lifting mechanism and the jack.

[0010] Preferably, the lifting bracket includes vertical struts connected to both ends of the cross beam. Through holes are provided in the vertical struts at intervals in the up and down directions; the cross beam is arranged between the corresponding through holes on the vertical struts at both ends; the through holes on the vertical struts form the lifting mechanism.

[0011] Further preferably, the through holes are round holes, and the cross beam is formed by load-bearing pins inserted into the through holes.

[0012] Further preferably, the lower ends of the vertical struts at both ends of the cross beam are connected together by a cross brace, and the connecting member is provided at the lower end of the cross brace.

[0013] Further preferably, the valve body extraction device includes a cushion cylinder through which the lifting bracket passes. The jack is a scissor jack arranged between the cushion cylinder and the cross beam; the scissor jack is arranged between the vertical struts at both ends of the cross beam.

[0014] More preferably, the inner diameter of the cushion cylinder is greater than the outer diameter of the valve body, and the height of the cushion cylinder is greater than the height of the valve body.

[0015] Preferably, the connecting member includes a connecting rod, and an external thread for cooperating with the internal thread on the valve body is provided at the lower end of the connecting rod. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the valve body extraction device according to Embodiment 1 of the present utility model;

[0017] Figure 2 It is a left view (the jack is omitted) of the valve body extraction device according to Embodiment 1 of the present utility model;

[0018] Figure 3Schematic diagram of the lifting bracket and cushion cylinder structure of Embodiment 1 of the present utility model;

[0019] Figure 4 Left view of the lifting bracket of Embodiment 1 of the present utility model;

[0020] Wherein, 1 - pump body; 2 - valve body; 3 - cushion cylinder; 4 - jack; 5 - lifting bracket; 6 - pin hole; 7 - load-bearing pin. Detailed implementation manners

[0021] The technical concept of the present utility model is to use a beam that can be lifted and adjusted (embodied in the form of a load-bearing pin in the following embodiments) in cooperation with a jack. After the jack reaches the stroke limit when jacking up, the jack and the beam reset, and the jack jacks up again to reach the stroke limit. After repeating this several times, the valve body at a deeper position can be taken out from the inner cavity of the pump head.

[0022] In the design of the technical solution, the prior art generally uses a pull rod to pull out the valve body. The present utility model designs a lifting bracket. The lower end of the lifting bracket is connected to the valve body to achieve the same function as the existing pull rod. The upper end of the lifting bracket is provided with a beam for the jack to jack up against and a lifting mechanism for adjusting the lifting of the beam. This not only simplifies the connection structure between the lifting bracket and the jack (the prior art uses a nut to cooperate with the thread on the pull rod to set the pull rod on the piston of the jack), but also can conveniently pull out the valve body at a deeper position.

[0023] Furthermore, the use of a cushion cylinder and a scissor jack can further optimize the process of pulling out the valve body, ensure time-saving and labor-saving in the pump valve maintenance operation, and improve work efficiency.

[0024] The implementation process of the present utility model will be described in detail below with reference to specific embodiments.

[0025] Embodiment 1

[0026] The valve body extraction device of this embodiment, as Figures 1 to 2 shown, includes a lifting bracket 5, a jack 4 and a cushion cylinder 3.

[0027] The lifting bracket 5 has a frame structure including a crossbeam and can establish a connection with the valve body 2 in the inner cavity of the pump body 1. The lower end of the lifting bracket 5 is provided with a connector for connecting to the valve body 2, and the upper end of the lifting bracket 5 is provided with a crossbeam for the jack 4 to push upward and a lifting mechanism for adjusting the lifting of the crossbeam. Here, the valve body 2 is located in the inner cavity of the pump body 1, and needs to establish a connection relationship with the connector of the lifting bracket 5 before being taken out by the jack 4 or other lifting devices. The connection relationship between the valve body 2 and the connector can refer to the relevant prior art. When the valve body 2 is provided with a thread, the connector is provided with a corresponding thread structure. When the valve body 2 is a valve seat or other structure containing a center hole, the connector can be provided with a mechanism such as a claw to achieve hooking and connection with the valve seat. The setting of the crossbeam can ensure that the jack 4 maintains a vertical force when pushing upward, thereby avoiding deformation and damage to the valve body 2 as much as possible. The lifting structure for adjusting the lifting of the crossbeam can adjust the height of the crossbeam and lock the position of the crossbeam after adjusting the height.

[0028] like Figure 3 and Figure 4 As shown, the lifting bracket 5 includes a U-shaped frame consisting of two parallel vertical supports and a horizontal support connected between the bottoms of the two parallel vertical supports, and the lower end of the horizontal support of the U-shaped frame is connected to a connecting piece for connecting the valve body 2. The vertical supports are provided with through holes at intervals along the height direction thereof, and the through holes on the two vertical supports are symmetrically arranged in the horizontal direction. In the embodiment, the vertical supports are made of flat iron, and the through holes on the vertical supports are circular pin holes 6. The circular pin holes 6 on the two vertical supports are provided for the load-bearing pins 7 to pass through, and the load-bearing pins 7 can act as crossbeams after the passing. The circular pin holes 6 arranged at intervals along the height direction of the vertical supports constitute a lifting mechanism, and the load-bearing pins 7 can be passed through the circular pin holes 6 at different heights to achieve the adjustment and fixation of the crossbeam at different heights.

[0029] The connection piece at the lower end of the lifting bracket 5 includes a connecting rod, and the connecting rod is provided with an external thread that matches the internal thread on the valve body 2. In this way, a reliable connection between the lifting bracket 5 and the valve body 2 can be established through the threaded connection between the connecting rod and the valve body 2. Of course, the valve body 2 can also have other connection structures such as a center hole, and the connection relationship can be established using an adapted connection piece.

[0030] In a preferred embodiment, Figure 1 As shown, the jack 4 uses a scissor jack, that is, an ordinary vehicle-mounted jack, which uses the principles of scissor-type lifting and screw transmission to achieve safe and stable lifting. It has the advantages of being simple and light, not limited in space, safe in lifting force state, and high in work efficiency.

[0031] In addition, the use of the cushion tube 3 in conjunction with the scissor jack can increase the adaptability of the on-site valve body 2 removal operation and further improve work efficiency. Figure 1As shown, during operation, the scissor jack is inserted between two cross braces. The base of the scissor jack is placed on the upper end face of the cushion cylinder 3, and the jacking end of the scissor jack faces the cross beam. Here, the cushion cylinder 3 serves to support the scissor jack. Further, in this embodiment, the inner diameter of the cushion cylinder 3 is greater than the outer diameter of the valve body 2, and the height of the cushion cylinder 3 is greater than the height of the valve body 2. In this way, relying on the feature of high-stroke extraction of the present utility model, the valve body 2 can be completely taken out from the inner cavity of the pump body 1 and enter the cushion cylinder 3. In contrast, in the prior art (such as CN115723092A, CN204868757U, etc.), the jack-type extraction tool can only pull the valve body 2 towards the opening position close to the inner cavity of the pump body 1. After that, it is necessary to move the extraction tool away and extract it a second time to completely take out the valve body 2. By adopting the above cushion cylinder 3 and cooperating with the use of the scissor jack, the present utility model can further simplify the process of taking out the valve body 2 and improve work efficiency.

[0032] In other implementation cases, a conventional hydraulic jack can be used to replace the scissor jack. Its usage state is the same as that of the scissor jack, that is, the hydraulic jack is placed between the cushion cylinder 3 and the load-bearing pin 7. The base of the hydraulic jack contacts the cushion cylinder 3, and the valve body is pulled outwards by relying on the piston of the hydraulic jack. In order to facilitate placing the hydraulic jack between two parallel vertical braces, the interval between the two parallel vertical braces can be appropriately increased. At this time, it is only necessary to ensure that the connecting piece connected to the cross brace can extend into the inner cavity of the pump body 1 and establish a connection with the valve body 2.

[0033] The process of taking out the valve body 2 by the valve body extraction device of the present utility model is as follows: First, connect the external thread on the connecting piece of the lifting bracket 5 with the internal thread of the valve body 2. Then, place the cushion cylinder 3 on the upper part of the pump head and make the lifting bracket 5 located at the center of the cushion cylinder 3. The scissor jack enters from the upper opening of the U-shaped frame and is placed on the upper end face (plane) of the cushion cylinder 3. The load-bearing pin 7 passes through the symmetric pin holes 6 of the lifting bracket 5 and contacts (or has a certain gap) with the top of the scissor jack. After that, use a tool to rotate the lifting screw of the scissor jack, and the scissor jack jacks up the load-bearing pin 7 and drives the lifting bracket 5 and the valve body 2 to move upwards. When the valve body 2 is not completely taken out, reset the scissor jack, adjust the height of the load-bearing pin 7 to a suitable position (convenient for the scissor jack to jack up), and then make the scissor jack jack up the lifting bracket 5 and the valve body 2 again; repeat the above actions of adjusting the height of the load-bearing pin 7 and jacking up the scissor jack until the valve body 2 is completely lifted into the cushion cylinder 3, that is, the valve body 2 is completely taken out.

[0034] Embodiment 2

[0035] The valve body extraction device of this embodiment includes a lifting bracket and a jack.

[0036] Among them, the structure of the lifting bracket is the same as that of the lifting bracket in Embodiment 1. The jack uses a hollow jack. The lifting bracket is passed through the vertical channel of the piston of the hollow jack. A cushion block is added between the top of the piston of the hollow jack and the cross beam of the lifting bracket. The cushion block passes through between the two cross braces, and both ends of the cushion block are placed on the piston of the hollow jack. When extracting the valve body, the hollow jack jacks up the cushion block and the lifting bracket. Then, in combination with the cross beam lifting mechanism of the lifting bracket, the valve body at a deeper position is taken out in the same manner as in Embodiment 1.

Claims

1. A valve body extraction device, comprising a jack, characterized in that: It also includes a lifting bracket, the lower end of which is provided with a connecting piece for connecting with the valve body, and the upper end of which is provided with a crossbeam for the jack to push upward and a lifting mechanism for adjusting the lifting of the crossbeam.

2. The valve body extraction device according to claim 1, characterized in that: The lifting bracket includes vertical supports connected to both ends of the crossbeam, and the vertical supports are provided with through holes spaced apart in the up-and-down direction; the crossbeam passes through the corresponding through holes on the vertical supports at both ends; and the through holes on the vertical supports constitute the lifting mechanism.

3. The valve body extraction device according to claim 2, characterized in that: The through hole is a circular hole, and the crossbeam is formed by a load-bearing pin inserted in the through hole.

4. The valve body extraction device according to claim 2, characterized in that: The lower ends of the vertical supports at both ends of the crossbeam are connected together through a cross support, and the lower end of the cross support is provided with the connecting piece.

5. The valve body extraction device according to claim 2, characterized in that: The valve body extraction device comprises a cushion cylinder for the lifting bracket to pass through, and the jack is a scissor-type jack arranged between the cushion cylinder and the crossbeam; the scissor-type jack is passed between the vertical supports located at both ends of the crossbeam.

6. The valve body extraction device according to claim 5, characterized in that: The inner diameter of the gasket cylinder is larger than the outer diameter of the valve body, and the height of the gasket cylinder is larger than the height of the valve body.

7. The valve body extraction device according to claim 1 or 4, characterized in that: The connecting piece comprises a connecting rod, and the lower end of the connecting rod is provided with an external thread for matching with the internal thread on the valve body.

Images