Valve seat tensioning tool of gate valve

Abstract

The utility model relates to the technical field of gate valve assembly, and discloses a valve seat tensioning tool of a gate valve, which comprises a pull cylinder suitable for being matched with a channel hole of the gate valve, the pull cylinder is provided with an inner circular truncated cone surface and a plurality of mounting holes, and the outer wall of the pull cylinder is provided with a communicating groove; the core sleeve is provided with an outer circular truncated cone surface matched with the inner circular truncated cone surface; one end of the mandrel is connected with the core sleeve, and the other end is in threaded connection with the pull cylinder; the clamping columns are arranged in one-to-one correspondence with the mounting holes, one ends of the clamping columns abut against the outer circular truncated cone face of the core sleeve, the other ends of the clamping columns are provided with containing grooves, the clamping columns can protrude out of the outer wall of the pull cylinder or retract to the mounting holes, and the containing grooves and the communicating grooves form annular grooves; the elastic ring is accommodated in the annular groove; the pressing ring is arranged on the outer side of the other end of the pull cylinder in a sleeving manner; and the tightening nut is arranged on one side, opposite to the core sleeve, of the pressing ring and is in threaded connection with the pull cylinder. The two valve seats are tensioned through the two sets of tools, the two valve seats are opened by a certain distance, an operator only needs to conduct simple operation, and time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of gate valve assembly, and particularly to a valve seat tightening tool for a gate valve. Background Art

[0002] At present, a flat gate valve is a relatively commonly used valve in fields such as petroleum. This kind of valve has good sealing performance and is widely used. Flat gate valves are widely used in various industries such as oil pipelines, liquefied natural gas, gas, and water.

[0003] In order to achieve the initial seal at the inlet and outlet ends of the flat gate valve, a certain initial specific pressure must be maintained between the left and right valve seats of the gate valve and the gate plate, that is, the distance between the two valve seats after they are installed in the valve body is smaller than the size of the gate plate. When the gate plate is installed, the two valve seats will be pressed against the two side surfaces of the gate plate to generate an initial specific pressure. However, this also makes it impossible to directly place the gate plate between the left and right valve seats in the free state during assembly. It is necessary to press the two valve seats to compress and deform the left and right springs, so that the left and right valve seats can axially move along their respective valve seat mounting holes and move away from each other, so that the gate plate can be installed.

[0004] Due to the small space inside the valve body of the small-diameter flat gate valve, when manually assembling the gate plate, it is time-consuming and laborious to open a certain distance between the left and right valve seats, and the operation is relatively difficult. Summary of the Utility Model

[0005] In view of this, the utility model provides a valve seat tightening tool for a gate valve to solve the problems that it is difficult and time-consuming to operate when manually assembling the gate plate and it is necessary to open the two valve seats.

[0006] The utility model provides a valve seat tightening tool for a gate valve, including: a pull cylinder adapted to fit into a channel hole formed by the valve body and the valve seat of the gate valve. The pull cylinder has an inner circular table surface, and a plurality of mounting holes penetrating through its outer wall and the inner circular table surface are provided on the pull cylinder. The plurality of mounting holes are arranged circumferentially along the pull cylinder. A communication groove connecting adjacent two mounting holes is provided on the outer wall of the pull cylinder; a core sleeve is arranged inside the pull cylinder and has an outer circular table surface that cooperates with the inner circular table surface; a core shaft is connected to the core sleeve at one end and is threadedly connected to the pull cylinder at the other end and passes through the pull cylinder to form an operating end; a plurality of clamping columns are provided corresponding to the plurality of mounting holes one by one. One end of the clamping column abuts against the outer circular table surface of the core sleeve, and a receiving groove extending circumferentially along the pull cylinder is provided at the other end. The clamping column can protrude from the outer wall of the pull cylinder or can retract into the mounting hole. The plurality of receiving grooves and the communication groove form an annular groove; an elastic ring is received in the annular groove; a pressure ring is sleeved on the outside of the other end of the pull cylinder and is adapted to cooperate with the end face of the valve body; a tightening nut is arranged on the side of the pressure ring facing away from the core sleeve, and the tightening nut is threadedly connected to the pull cylinder.

[0007] Beneficial effects: After the valve seat is assembled in the valve seat hole of the valve body, insert the valve seat tightening tooling into the channel hole. When the clamping post aligns with the card slot on the valve seat, install a pressure ring at the end flange of the valve body. Then, install a tightening nut on the pulling cylinder, rotate the mandrel to drive the core sleeve to move, and at the same time push the clamping post to move outward along the radial direction of the pulling cylinder. The clamping post protrudes from the outer wall of the pulling cylinder and is stuck into the card slot of the valve seat. Then, rotate the tightening nut. Under the reaction force of the pressure ring, the pulling cylinder drives the valve body to move towards the channel opening of the valve body, and the valve seat compresses the elastic member between the valve seat and the valve body. The elastic member is in a compressed state under force, realizing the tightening of one valve seat. Repeat the above steps to realize the tightening of another valve seat through another set of valve seat tightening tooling. In this way, after the two valve seats are spread apart by a certain distance by the two valve seat tightening tooling, the gate plate can be smoothly placed. After the gate plate is installed, first rotate the tightening nut in the reverse direction. The valve seat fits with the gate plate under the elastic force of the elastic member. At this time, the elastic member is in a working state. Then, rotate the mandrel to drive the core sleeve to move, and the clamping post moves inward through the contraction force of the elastic ring. The clamping post retracts into the installation hole, that is, the clamping post recesses into the tooling, and the tooling on both sides of the valve body is pulled out from the valve body to complete the assembly of the gate plate. In this way, the two valve seats are tightened by the two sets of valve seat tightening tooling, and then the two valve seats are spread apart by a certain distance. The operator only needs simple operations, which are simple, time-saving and labor-saving.

[0008] In an alternative embodiment, the outer diameter of one end of the circular table surface close to the operation end is smaller than that of the other end.

[0009] In an alternative embodiment, a limiting groove is provided on the inner wall of the pulling cylinder. The limiting groove is located on the side of the inner circular table surface facing away from the operation end, and a limiting member is provided in the limiting groove. The limiting member is suitable for limiting the position of the core sleeve.

[0010] Beneficial effects: After the gate plate fits with the valve seat, rotate the mandrel to drive the core sleeve to move. When the core sleeve moves to contact the limiting member, it means that the clamping post has completely retracted into the installation hole. The operator does not need to rotate the mandrel anymore. The setting of the limiting member reminds the operator that the clamping post has reached the position, and then the tooling can be pulled out.

[0011] In an alternative embodiment, there is also a stepped surface on the inner wall of the pulling cylinder between the inner circular table surface and the limiting groove. A limiting space is formed between the stepped surface and the limiting member, and a blocking member is provided in the limiting space.

[0012] Beneficial effects: The position of the core sleeve is limited jointly by the limiting member and the blocking member, and the limiting is more reliable.

[0013] In an alternative embodiment, one end of the clamping post is hemispherical.

[0014] Beneficial effects: The hemispherical end of the clamping post is smoothly mated with the outer circular table surface, which can reduce the friction between the clamping post and the core sleeve, effectively avoid the situation of excessive wear of the clamping post, and thus extend the service life of the clamping post.

[0015] In an alternative embodiment, the mandrel has a first threaded section and a second threaded section arranged at intervals. The first threaded section is threadedly connected to the core sleeve, and the second threaded section is threadedly connected to the drawing cylinder.

[0016] Beneficial effects: The connection method between the mandrel, the core sleeve and the drawing cylinder is simple.

[0017] In an alternative embodiment, the convex teeth of the first threaded section are the same as those of the second threaded section.

[0018] Beneficial effects: It can ensure the coaxiality between the mandrel and the drawing cylinder, ensure that the tooling smoothly enters and exits the channel hole, and thus effectively avoid the situation where the tooling is stuck and cannot be taken out.

[0019] In an alternative embodiment, the drawing cylinder includes a short cylinder, a long cylinder and a nut. The short cylinder and the nut are connected to both ends of the long cylinder. The outer diameter of the long cylinder is smaller than that of the short cylinder, and the outer diameter of the nut is smaller than that of the long cylinder. The mandrel is threadedly connected to the nut, and the short cylinder is provided with a mounting hole.

[0020] Beneficial effects: The outer diameter of the short cylinder is slightly smaller than the aperture of the channel hole, which is convenient for the disassembly and assembly of the tooling. And the drawing cylinder is disassembled into three parts for separate manufacturing and assembly. The outer diameter of the long cylinder is smaller than the aperture of the channel hole, and the external thread on the long cylinder will not contact the channel hole, effectively avoiding the situation of damage to the inner wall surface of the channel hole.

[0021] In an alternative embodiment, the pressure ring has a pressing part and a supporting part. The pressing part is adapted to cooperate with the end face of the valve body. The supporting part is arranged on the side of the pressing part facing the core sleeve and protrudes from the end face of the pressing part. The supporting part is adapted to be inserted into the end of the channel hole and is adapted to the channel hole.

[0022] Beneficial effects: By inserting the supporting part into the end of the channel hole, the outer end of the drawing cylinder can be supported, making the tooling more stable and reliable.

[0023] In an alternative embodiment, the core sleeve further has an outer guiding surface, and the inner wall of the drawing cylinder further has an inner guiding surface. The inner guiding surface is located on the side of the mounting hole facing the operating end.

[0024] Beneficial effects: Through the sliding fit between the outer guiding surface and the inner guiding surface, the movement of the core sleeve can be guided, making the movement of the core sleeve smoother and more stable. Both the outer guiding surface and the inner guiding surface are cylindrical surfaces. Description of the Drawings

[0025] To more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 A cross-sectional view of a seat tightening tooling for a gate valve according to an embodiment of the present utility model;

[0027] Figure 2 For Figure 1 A left view of the left side portion of the seat tightening tooling shown;

[0028] Figure 3 A cross-sectional view of a seat installed on a valve body of a gate valve according to an embodiment of the present utility model;

[0029] Figure 4 For Figure 3 A cross-sectional view of a draw tube assembly installed in the passage holes of the valve body and the seat shown;

[0030] Figure 5 For Figure 4 A cross-sectional view of a pressure ring and a tightening nut installed on the draw tube assembly shown;

[0031] Figure 6 For Figure 5 A cross-sectional view of the other end of the clamping post moving into the card slot shown;

[0032] Figure 7 For Figure 6 A partial cross-sectional view of the seat tightening tooling shown;

[0033] Figure 8 For Figure 7 A structural schematic diagram of the seat tightening tooling shown;

[0034] Figure 9 For Figure 6 A cross-sectional view of the tightening nut being screwed shown;

[0035] Figure 10 For Figure 9 A cross-sectional view of another seat and another seat tightening tooling installed on the valve body shown;

[0036] Figure 11 For Figure 10 A cross-sectional view of a gate plate installed between two seats shown;

[0037] Figure 12 For Figure 11 A cross-sectional view of the seat pressing the gate plate shown;

[0038] Figure 13 For Figure 12 The sectional view of the card post retracted into the mounting hole as shown;

[0039] Figure 14 For Figure 13 The partial sectional view of the valve seat tensioning tooling as shown;

[0040] Figure 15 For Figure 14 The structural schematic diagram of the valve seat tensioning tooling as shown;

[0041] Figure 16 For Figure 13 The sectional view of the gate valve removing the valve seat tensioning tooling as shown.

[0042] Explanation of reference numerals:

[0043] 1. Pulling cylinder; 101. Inner circular table surface; 103. Short cylinder; 104. Long cylinder; 105. Nut; 106. Inner guiding surface;

[0044] 2. Core sleeve; 201. Outer circular table surface;

[0045] 3. Core shaft; 301. First threaded section; 302. Second threaded section;

[0046] 4. Card post; 401. Accommodating groove;

[0047] 5. Elastic ring;

[0048] 6. Limiting part;

[0049] 7. Stopping part;

[0050] 8. Pressing ring; 801. Pressing part; 802. Supporting part;

[0051] 9. Tightening nut;

[0052] 20. Gate valve; 2001. Valve body; 2002. Valve seat; 2003. Gate plate; 2004. Sealing ring; 2005. Channel hole; 2006. Spring. Detailed implementation manners

[0053] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present utility model.

[0054] The following combines with Figures 1 to 16 to describe embodiments of the present utility model.

[0055] According to an embodiment of the present utility model, there is provided a valve seat tightening tool for a gate valve, including: a draw tube 1, a core sleeve 2, a core shaft 3, a plurality of clamping posts 4, an elastic ring 5, a pressure ring 8 and a tightening nut 9.

[0056] Specifically, the draw tube 1 is adapted to be fitted with a through-hole 2005 formed by a valve body 2001 and a valve seat 2002 of the gate valve 20. The draw tube 1 has an inner circular table surface 101. A plurality of mounting holes penetrating through its outer wall and the inner circular table surface 101 are formed on the draw tube 1. The plurality of mounting holes are arranged along the circumferential direction of the draw tube 1. A communication groove connecting two adjacent mounting holes is provided on the outer wall of the draw tube 1; the core sleeve 2 is arranged inside the draw tube 1 and has an outer circular table surface 201 that cooperates with the inner circular table surface 101; one end of the core shaft 3 is connected to the core sleeve 2, and the other end is threadedly connected to the draw tube 1 and then passes through the draw tube 1 to form an operation end; the plurality of clamping posts 4 are arranged in one-to-one correspondence with the plurality of mounting holes. One end of the clamping post 4 abuts against the outer circular table surface 201 of the core sleeve 2, and a receiving groove 401 extending along the circumferential direction of the draw tube 1 is formed at the other end. The clamping post 4 can protrude from the outer wall of the draw tube 1 or can be retracted into the mounting hole. The plurality of receiving grooves 401 and the communication groove form an annular groove; the elastic ring 5 is received in the annular groove; the pressure ring 8 is sleeved on the outer side of the other end of the draw tube 1 and is adapted to cooperate with the end face of the valve body 2001; the tightening nut 9 is arranged on the side of the pressure ring 8 facing away from the core sleeve 2, and the tightening nut 9 is threadedly connected to the draw tube 1.

[0057] Applying the valve seat tightening tooling of this embodiment, after assembling the valve seat 2002 in the valve seat hole of the valve body 2001, insert the valve seat tightening tooling into the channel hole 2005. When the clamping post 4 aligns with the card slot on the valve seat 2002, install the pressure ring 8 at the end flange of the valve body 2001. Then install the tightening nut 9 on the draw tube 1. Rotate the mandrel 3 to drive the core sleeve 2 to move, and at the same time push the clamping post 4 to move outward along the radial direction of the draw tube 1. The clamping post 4 protrudes from the outer wall of the draw tube 1 and is stuck into the card slot of the valve seat 2002. Then rotate the tightening nut 9. Under the reaction force of the pressure ring 8, the draw tube 1 drives the valve body 2001 to move towards the channel opening direction of the valve body 2001. The valve seat 2002 compresses the elastic member between the valve seat 2002 and the valve body 2001, and the elastic member is in a compressed state under force, realizing the tightening of one valve seat 2002. Repeat the above steps to realize the tightening of another valve seat 2002 through another set of valve seat tightening tooling. In this way, after the two valve seats 2002 are spread apart by a certain distance by the two valve seat tightening tooling, the gate plate 2003 can be smoothly placed. After installing the gate plate 2003, first rotate the tightening nut 9 in the reverse direction. The valve seat 2002 fits with the gate plate 2003 under the elastic force of the elastic member. At this time, the elastic member is in the working state. Then rotate the mandrel 3 to drive the core sleeve 2 to move, and the clamping post 4 moves inward under the contraction force of the elastic ring 5. The clamping post 4 retracts into the installation hole, that is, the clamping post 4 recesses into the tooling, and the tooling on both sides of the valve body 2001 is withdrawn from the valve body 2001 to complete the assembly of the gate plate 2003. In this way, the two valve seats 2002 are tightened by the two sets of valve seat tightening tooling, and then the two valve seats 2002 are spread apart by a certain distance. The operator only needs simple operations, which are simple, time-saving and labor-saving.

[0058] In the related art, the valve seat puller includes a housing, a clamping shaft, a cone, a top shaft, etc. At least two through holes are provided at the front end of the housing. A clamping shaft is installed in each through hole. The clamping shaft is composed of a fixed column, a spring, and a top plate. One end of the fixed column is sleeved with a spring and extends into the through hole. The other end of the fixed column is installed with a top plate. The spring abuts between the inner wall of the housing and the top plate. The inner diameter of the spring is larger than the outer diameter of one end of the fixed column. The spring is extremely easy to shift, so that the end of the spring is stuck into the through hole, resulting in the through hole getting stuck with the spring and the spring being stuck, and further resulting in the clamping shaft being unable to reset, thus causing the valve seat puller to be unable to be disassembled.

[0059] To solve the above problems, in this embodiment, as Figure 7 、 Figure 8 、 Figure 14 and Figure 15As shown, a number of clamping posts 4 can be retracted simultaneously under the action of an elastic ring 5. When the clamping posts 4 are retracted into the mounting holes, the elastic ring 5 is accommodated in the annular groove; when the clamping posts 4 protrude from the outer wall of the pulling cylinder 1, part of the elastic ring 5 is located in the accommodating groove 401 and part is located in the clamping groove of the valve seat 2002. The contact surface between the elastic ring 5 and the clamping post 4 is an arc surface, and the direction in which the elastic force of the elastic ring 5 is applied to the clamping post 4 is radial. The elastic ring 5 is annular, not easily entering the mounting hole, and not easily causing the clamping post 4 to be stuck and unable to reset, thereby avoiding the situation in the prior art where the spring is stuck and the clamping shaft cannot be reset, resulting in the inability to disassemble the tensioner.

[0060] Specifically, the clamping post 4 is adapted to be retracted into the mounting hole under the action of the contraction force of the elastic ring 5, and the clamping post 4 is also adapted to move outward in the radial direction of the pulling cylinder 1 against the contraction force of the elastic ring 5 under the pulling force of the mandrel 3, so as to protrude from the outer wall of the pulling cylinder 1 and be clamped into the clamping groove of the valve seat 2002. The mandrel 3 is adapted to rotate relative to the pulling cylinder 1 under the action of an external force and drive the core sleeve 2 to move axially, and the tightening nut 9 is adapted to rotate under the action of an external force and drive the pulling cylinder 1 to move. By screwing the tightening nut 9 and the mandrel 3, the tightening or loosening of the valve seat 2002 and the disassembly and assembly of the tooling can be realized, and the operation is simple and labor-saving.

[0061] In one embodiment, the outer diameter of one end of the conical surface close to the operating end is smaller than that of the other end. When the core sleeve 2 moves forward, the core sleeve 2 pushes the clamping post 4 to move outward in the radial direction of the pulling cylinder 1; under the action of the elastic ring 5, the clamping post 4 moves inward in the radial direction of the pulling cylinder 1 and the core sleeve 2 moves backward.

[0062] It should be noted that the valve seat 2002 has a sealing surface that cooperates with the gate plate 2003. The forward movement of the core sleeve 2 means that the core sleeve 2 moves in a direction away from the sealing surface, and the backward movement of the core sleeve 2 means that the core sleeve 2 moves toward the sealing surface. In Figure 7 and Figure 14 the horizontal arrow indicates the moving direction of the core sleeve 2 and the mandrel 3, and the vertical arrow indicates the moving direction of the clamping post 4.

[0063] In addition, in other embodiments, the outer diameter of one end of the conical surface close to the operating end is larger than that of the other end. When the core sleeve 2 moves backward, the core sleeve 2 pushes the clamping post 4 to move outward in the radial direction of the pulling cylinder 1; under the action of the elastic ring 5, the clamping post 4 moves inward in the radial direction of the pulling cylinder 1 and the core sleeve 2 moves forward.

[0064] In one embodiment, as Figure 1 and Figure 7As shown in the figure, a limiting groove is provided on the inner wall of the draw tube 1. The limiting groove is located on the side of the inner circular table surface 101 facing away from the operating end. A limiting member 6 is provided in the limiting groove, and the limiting member 6 is adapted to limit the position of the core sleeve 2. After the gate 2003 is in contact with the valve seat 2002, the mandrel 3 is rotated to drive the core sleeve 2 to move. When the core sleeve 2 moves to contact the limiting member 6, it indicates that the latch 4 has been completely retracted into the mounting hole, and the operator no longer needs to rotate the mandrel 3. The setting of the limiting member 6 is used to remind the operator that the latch 4 is in place, and then the tooling can be withdrawn.

[0065] Specifically, the limiting member 6 is an elastic retaining ring. The elastic retaining ring can be deformed to a certain extent under the action of the core sleeve 2 without being damaged, thereby prolonging the service life of the limiting member 6.

[0066] In one embodiment, the inner wall of the draw tube 1 further has a stepped surface located between the inner circular table surface 101 and the limiting groove. A limiting space is formed between the stepped surface and the limiting member 6, and a blocking member 7 is provided in the limiting space. The positions of the core sleeve 2 are jointly limited by the limiting member 6 and the blocking member 7, and the limiting is more reliable.

[0067] In addition, in other embodiments, only the limiting member 6 can be provided without providing the blocking member 7.

[0068] In one embodiment, one end of the latch 4 is hemispherical, and the hemispherical end of the latch 4 is smoothly matched with the outer circular table surface 201, which can reduce the friction between the latch 4 and the core sleeve 2, effectively avoid the situation that the latch 4 wears too fast, and further prolong the service life of the latch 4.

[0069] In one embodiment, the mandrel 3 has a first thread section 301 and a second thread section 302 arranged at intervals. The first thread section 301 is threadedly connected to the core sleeve 2, and the second thread section 302 is threadedly connected to the draw tube 1. The connection manner of the mandrel 3 with the core sleeve 2 and the draw tube 1 is simple.

[0070] In one embodiment, the convex teeth of the first thread section 301 are the same as those of the second thread section 302, which can ensure the coaxiality between the mandrel 3 and the draw tube 1, ensure that the tooling smoothly enters and exits the channel hole 2005, and effectively avoid the situation that the tooling is stuck and cannot be taken out.

[0071] In the related art, the outer diameter of the housing is closely fitted with the inner diameter of the channel of the valve body, and the thread of the housing will enter the channel of the valve body. Under the action of external force, there is a risk of damaging the inner wall surface of the channel of the valve body, resulting in subsequent leakage of the valve body.

[0072] To solve the above problems, in one embodiment, as Figure 1As shown, the drawtube 1 includes a short tube 103, a long tube 104 and a nut 105. The short tube 103 and the nut 105 are connected to both ends of the long tube 104. The outer diameter of the long tube 104 is smaller than that of the short tube 103, and the outer diameter of the nut 105 is smaller than that of the long tube 104. The mandrel 3 is threadedly connected to the nut 105, and the short tube 103 is provided with a mounting hole. The outer diameter of the short tube 103 is slightly smaller than the aperture of the channel hole 2005, which facilitates the disassembly and assembly of the tooling. Moreover, the drawtube is disassembled into three parts for separate manufacturing and assembly. The outer diameter of the long tube 104 is smaller than the aperture of the channel hole 2005, and the external thread on the long tube will not contact the channel hole, effectively avoiding damage to the inner wall surface of the channel hole.

[0073] Furthermore, the short tube 103 and the long tube 104 are welded, and welding can ensure the connection strength and structural strength of the two.

[0074] In one embodiment, as Figure 1 and Figure 5 shown, the pressure ring 8 has a pressing portion 801 and a supporting portion 802. The pressing portion 801 is adapted to cooperate with the end face of the valve body 2001, and the supporting portion 802 is disposed on the side of the pressing portion 801 facing the core sleeve 2 and protrudes from the end face of the pressing portion 801. The supporting portion 802 is adapted to be inserted into the end of the channel hole 2005 to be adapted to the channel hole 2005. By inserting the supporting portion 802 into the end of the channel hole 2005, the outer end of the drawtube 1 can be supported, making the tooling more stable and reliable.

[0075] In one embodiment, the core sleeve 2 further has an outer guiding surface, and the inner wall of the drawtube 1 further has an inner guiding surface 106. The inner guiding surface 106 is located on the side of the mounting hole facing the operating end. Through the sliding cooperation between the outer guiding surface and the inner guiding surface 106, the movement of the core sleeve 2 can be guided, making the movement of the core sleeve 2 smoother and more stable. Both the outer guiding surface and the inner guiding surface are cylindrical surfaces.

[0076] It should be noted that Figure 1 、 Figures 4 to 6 、 Figures 9 to 13 the black area at the mandrel 3 of Figure 1 、 Figures 4 to 7 、 Figures 9 to 14 refers to the thread, Figure 7 and Figure 14 the black area between the long tube 104 and the short tube 103 in Figure 9 、 Figure 12 、 Figure 13 refers to the welding position,

[0077] The installation process of the valve seat 2002 and the gate plate 2003 of the gate valve 20 will be described below:

[0078] Step 1: After installing the spring 2006 and the O-ring on the valve seat 2002, load them into the valve body 2001. At this time, the spring 2006 is not compressed and is in a free state.

[0079] Step 2: Insert the valve seat tensioning tooling into the channel hole 2005 of the valve seat 2002 from the channel opening at the end of the valve body 2001.

[0080] Step 3: Install the pressure ring 8 at the end flange of the valve body 2001, and then install the tensioning nut 9 on the draw tube 1.

[0081] Step 4: Rotate the mandrel 3 of the valve seat tensioning tooling, so that the sleeve 2 moves forward under the tension of the mandrel 3. At the same time, push the latch 4 to move outward against the contraction force of the elastic ring 5. The latch 4 protrudes from the outer wall of the draw tube 1 and is caught in the card slot of the valve seat 2002.

[0082] Step 5: Use a tool to rotate the tensioning nut 9. Under the reaction force of the pressure ring 8, the valve seat tensioning tooling drives the valve seat 2002 to move towards the channel opening direction. The valve seat 2002 compresses the spring 2006, and the spring 2006 is in a compressed state under force.

[0083] Step 6: Repeat Steps 1 - 5 to install another valve seat 2002.

[0084] Step 7: Install the gate plate 2003 into the valve body 2001.

[0085] Step 8: Use a tool to rotate the tensioning nut 9. Under the action of the spring 2006, the valve seat 2002 fits with the gate plate 2003. At this time, the spring 2006 is in a working state.

[0086] Step 9: Reverse-rotate the mandrel 3 of the valve seat tensioning tooling, so that the sleeve 2 moves backward under the thrust of the mandrel 3. The latch 4 moves inward through the contraction force of the elastic body, so that the latch 4 is recessed into the draw tube.

[0087] Step 10: Withdraw the valve seat tensioning tooling on both sides from the valve body 2001, and the entire assembly process is completed.

[0088] In the related technology, the valve seat puller further includes a nut seat. The front end of the top shaft passes through the nut seat in a threaded manner and is fixed to the cone. The nut seat is fixed in the housing by screws. The machining precision requirements for parts such as the cone and the nut seat are high. If the machining precision of the parts exceeds the tolerance, it is easy to cause the non-concentricity between the top shaft and the nut seat, resulting in problems such as the tooling getting stuck and unable to be taken out; the assembly of the clamping shaft and the cone is difficult, there are many mating parts, and the assembly and installation time is long, seriously affecting the assembly efficiency.

[0089] In this embodiment, one end of the mandrel 3 is threadedly connected to the core sleeve 2, and the other end of the mandrel 3 is threadedly connected to the nut 105. The convex tooth structure of the threaded sections at both ends of the mandrel 3 can ensure the coaxiality between the mandrel 3 and the drawing cylinder 1, ensure that the tooling can smoothly enter and exit the channel hole 2005, and effectively avoid the situation where the tooling is stuck and cannot be taken out. Moreover, multiple clamping columns share one elastic ring 5, the number of parts of the tooling is small, the assembly time is reduced, and the assembly efficiency is improved. By screwing the tightening nut 9 and the mandrel 3, the tightening or loosening of the valve seat 2002 and the disassembly and assembly of the tooling can be achieved, the tooling can be quickly disassembled and assembled, the disassembly efficiency of the tooling is high, the time spent using the tooling is reduced, and thus the overall assembly efficiency is improved.

[0090] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A valve seat tightening tooling for a gate valve, characterized in that Comprising: A draw tube (1), adapted to fit into a channel hole formed by a valve body (2001) and a valve seat (2002) of a gate valve (20). The draw tube (1) has an inner circular table surface (101), and a plurality of mounting holes are provided in the draw tube (1) penetrating through its outer wall and the inner circular table surface (101). The plurality of mounting holes are arranged circumferentially along the draw tube (1), and a communication groove for connecting adjacent two of the mounting holes is provided on the outer wall of the draw tube (1); A core sleeve (2), arranged inside the draw tube (1) and having an outer circular table surface (201) cooperating with the inner circular table surface (101); A core shaft (3), one end of which is connected to the core sleeve (2), and the other end is threadedly connected to the draw tube (1) and then passes through the draw tube (1) to form an operating end; A plurality of clamping posts (4), arranged in one-to-one correspondence with the plurality of mounting holes. One end of the clamping post (4) abuts against the outer circular table surface (201) of the core sleeve (2), and a receiving groove (401) extending circumferentially along the draw tube (1) is provided at the other end. The clamping post (4) can protrude from the outer wall of the draw tube (1) or can retract into the mounting hole. The plurality of receiving grooves (401) and the communication groove form an annular groove; An elastic ring (5), received in the annular groove; A pressure ring (8), sleeved on the outer side of the other end of the draw tube (1) and adapted to cooperate with the end face of the valve body (2001); A tension nut (9), arranged on the side of the pressure ring (8) facing away from the core sleeve (2), and the tension nut (9) is threadedly connected to the draw tube (1).

2. The valve seat tightening tooling for the gate valve according to claim 1, characterized in that, The outer diameter of one end of the circular table surface close to the operating end is smaller than that of the other end.

3. The valve seat tightening tooling for the gate valve according to claim 1, characterized in that A limiting groove is provided on the inner wall of the draw tube (1), which is located on the side of the inner circular table surface (101) facing away from the operating end. A limiting member (6) is provided in the limiting groove, and the limiting member (6) is adapted to limit the position of the core sleeve (2).

4. The valve seat tightening tooling for the gate valve according to claim 3, characterized in that, A step surface is further provided on the inner wall of the draw tube (1) between the inner circular table surface (101) and the limiting groove. A limiting space is formed between the step surface and the limiting member (6), and a blocking member (7) is provided in the limiting space.

5. The valve seat tightening tooling for the gate valve according to any one of claims 1 to 4, characterized in that, One end of the clamping post (4) is hemispherical.

6. The valve seat tightening tooling for the gate valve according to any one of claims 1 to 4, characterized in that, The core shaft (3) has a first threaded section (301) and a second threaded section (302) arranged at intervals. The first threaded section (301) is threadedly connected to the core sleeve (2), and the second threaded section (302) is threadedly connected to the draw tube (1).

7. The valve seat tightening tooling for the gate valve according to claim 6, characterized in that, The convex teeth of the first threaded section (301) are the same as those of the second threaded section (302).

8. The valve seat tightening tooling for the gate valve according to any one of claims 1 to 4, characterized in that, The draw tube (1) includes a short tube (103), a long tube (104) and a nut (105). The short tube (103) and the nut (105) are connected to both ends of the long tube (104). The outer diameter of the long tube (104) is smaller than that of the short tube (103), and the outer diameter of the nut (105) is smaller than that of the long tube (104). The core shaft (3) is threadedly connected to the nut (105), and the mounting holes are provided on the short tube (103).

9. The valve seat tightening tooling for the gate valve according to claim 8, characterized in that, The pressing ring (8) has a pressing portion (801) and a supporting portion (802). The pressing portion (801) is adapted to cooperate with the end face of the valve body (2001). The supporting portion (802) is arranged on the side of the pressing portion (801) facing the core sleeve (2) and protrudes from the end face of the pressing portion (801). The supporting portion (802) is adapted to be inserted into the end of the channel hole and is adapted to the channel hole.

10. The valve seat tightening tooling for the gate valve according to any one of claims 1 to 4, characterized in that, The core sleeve (2) further has an outer guiding surface. The inner wall of the pulling cylinder (1) further has an inner guiding surface (106). The inner guiding surface (106) is located on the side of the mounting hole facing the operating end.

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