CN111350874B

CN111350874B - Method of assembling a hydrant valve stem assembly

Info

Publication number: CN111350874B
Application number: CN202010268439.8A
Authority: CN
Inventors: 何文刚
Original assignee: Jiangyin Hegang Machinery Co ltd
Current assignee: Jiangyin Hegang Machinery Co ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2021-09-28
Anticipated expiration: 2040-04-08
Also published as: CN111350874A

Abstract

The invention relates to an assembling method of a fire hydrant valve rod assembly, which comprises the following steps: (1) assembling the pressure sensor; (2) assembling a valve seat sealing plate; (3) assembling an upper valve clack; (4) assembling a valve rod outer pipe; (5) assembling a valve rod inner pipe; (6) assembling the anti-rotation sleeve; (7) and assembling the upper flange. According to the invention, the fire hydrant assembly is formed by sequentially assembling the lower valve clack and the upper flange from bottom to top and assembling all the parts on one production line, so that the time consumption of each operation procedure is shortest, no additional tool is needed, and the assembly difficulty is lower. Compared with the prior art, the assembling production efficiency of the fire hydrant assembly is greatly improved, and the assembling cost is reduced.

Description

Method of assembling a hydrant valve stem assembly

Technical Field

The invention belongs to the field of fire-fighting appliances, relates to a fire hydrant valve rod, and particularly relates to an assembling method of the fire hydrant valve rod assembly.

Background

The fire hydrant generally comprises a hand wheel, a valve rod, a valve clack, a valve cover and a valve body, wherein a water inlet and a water outlet are formed in the valve body, a sealing ring is arranged below the valve clack, the valve clack is fixed at the tail end of the valve rod, and the valve rod is generally assembled with the valve clack and the like to form a valve rod assembly. The traditional fire hydrant valve rod assembly is usually assembled by one worker, and the production efficiency is low due to the fact that the number of parts is large and the assembly process is complicated. In order to meet the production requirements of enterprises for improving quality and increasing efficiency, the applicant previously proposed an assembly method (China invention publication No. CN 109531111A) for decomposing a fire hydrant valve rod into an upper flange assembly body and a lower valve clack assembly body and combining the valve rod assembly bodies after being assembled respectively, so that the aim of performing flow operation according to steps is fulfilled, and the problem of low production efficiency of the traditional assembly mode is solved. However, in the production, the applicant finds that in the implementation process of the assembly method, because a plurality of assemblies are assembled and then assembled respectively, sequential operation on the same assembly line cannot be performed, so that some assemblies are assembled faster and some assemblies are assembled slower, accurate matching is difficult to achieve during assembly, fast assembly is achieved, and production resources are not wasted. In addition, in the assembling method, a plurality of V-shaped block tools are required to be used in the assembling process, the tool cost is high, the assembling process is complicated, the operation is complex, and the consumed time is long.

Therefore, in order to further improve the production efficiency and reduce the time consumption of each production process, the production process is more smoothly connected, and a brand new assembly method needs to be developed to realize the high-efficiency and high-quality production and assembly of the valve rod assembly of the fire hydrant.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an assembling method of a hydrant valve rod assembly, which can sequentially assemble all parts of the hydrant valve rod assembly in the same assembly line according to the sequence, has fewer overall processes, is simple and convenient to operate, has short time consumption of each step, does not need an additional V-shaped block tool, and has lower cost.

In order to achieve the purpose, the invention adopts the technical scheme that: a method of assembling a hydrant stem assembly comprising the steps of:

(1) assembling the pressure sensor: a pressure sensor is screwed into a threaded hole of the lower valve clack;

(2) assembling a valve seat sealing plate: a valve seat sealing plate is arranged on the lower valve clack, and then a water pressure test is carried out;

(3) assembling the upper valve clack: sleeving the upper valve clack into the lower valve clack and fastening, wherein a cable of the pressure sensor penetrates out of the upper valve clack;

(4) assembling a valve rod outer pipe: the valve rod outer pipe is sleeved on the upper valve clack and fastened, and a cable of the pressure sensor penetrates out of the valve rod outer pipe;

(5) assembling a valve rod inner pipe: sleeving a probe positioning sleeve at one end of the valve rod outer pipe, which is far away from the upper valve clack, sleeving a valve rod inner pipe into the valve rod outer pipe, and fastening the probe positioning sleeve, the valve rod outer pipe and the valve rod inner pipe together; the cable of the pressure sensor penetrates out of the inner pipe of the valve rod;

(6) assembling the anti-rotation sleeve: leading out a cable of the pressure sensor from a threading hole of the anti-rotation sleeve, and sleeving and fastening the anti-rotation sleeve and the inner pipe of the valve rod;

(7) assembling an upper flange: placing the upper flange upwards according to the flange face, correspondingly screwing 3 electrode holders into threaded holes of the upper flange after the 3 electrode holders are respectively placed into the O-shaped rings, and fastening the electrode holders by using a torque wrench with the torque of 50N; the upper flange is placed by turning 180 degrees, and a valve rod and an elastic cushion are installed after an O-shaped ring is placed in an inner hole of the upper flange; downwards connecting the threaded end of the anti-rotation sleeve assembled in the step (6) with the valve rod thread and installing an anti-rotation guide plate; screwing a threaded port of a pressure sensor cable into a flange thread, and fastening by using a torque wrench, wherein the torque is 15N; respectively connecting and fastening 3 electrode probes with 3 electrode holders in a threaded manner, wherein 2 longer probes penetrate into the probe positioning sleeve; the upper flange is turned over by 180 degrees, and the yellow, white and red waterproof wires are sequentially connected and fastened at the upper ends of the 3 electrode holders.

Preferably, in step (1), the pressure sensor is tightened with a torque wrench, torque 15N.

Preferably, the valve seat sealing plate is connected with the pressure measuring device during the water pressure test in the step (2), the pressure is released after the pressure reaches 15Pa, and the water does not leak from the interface of the pressure sensor.

Compared with the prior art, the invention has the beneficial effects that: according to the assembling method of the fire hydrant valve rod assembly, the fire hydrant valve rod assembly is assembled in a mode that the lower valve clack is assembled to the upper flange from bottom to top, the assembling process is divided into a plurality of standard operation procedures, and all parts can be assembled on one production line to form the fire hydrant assembly, so that the time consumption of each operation procedure is shortest, the assembling efficiency is highest, extra tools are not needed, and the assembling difficulty and the assembling cost are lower.

Drawings

FIG. 1 is a schematic structural view of a hydrant valve stem assembly in accordance with the present invention.

Detailed Description

The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.

The hydrant valve stem assembly shown in fig. 1 includes a lower valve flap 22, an upper valve flap 23, an outer valve stem tube 24, an inner valve stem tube 25, a probe retaining sleeve 26, an anti-rotation sleeve 27, an upper flange 20, and a valve stem 21.

The lower valve clack 22 comprises a supporting disc, a clamping convex block and an inner pipe body, wherein the clamping convex block is integrally formed at the center of the surface of the supporting disc, the inner wall of the inner pipe body is provided with internal threads, the diameter of the clamping convex block is smaller than that of the supporting disc, and a boss surface is formed at the joint of the clamping convex block and the supporting disc (one surface, far away from the clamping convex block, in the supporting disc is defined as the outer end surface of the supporting disc, and a plurality of third threaded holes are formed in the outer end surface; a pressure sensor (not shown) is threadedly mounted on the free end of the inner tube. The upper valve clack 23 comprises a base body 231 correspondingly covered on the clamping convex block and an outer tube body 232 which is integrally formed at the center of the outer surface of the base body 231 and is sleeved outside the inner tube body (the outer tube body 232 is provided with an upper valve clack screw hole 233); the base body 231 is fixed to the catching projection by a plurality of screws. At least one row of outer screw mounting holes 241 are formed in the valve rod outer pipe 24, and the extending direction of the row of outer screw mounting holes 241 is parallel to the axial lead of the valve rod outer pipe 24), so that screws can penetrate into the upper valve clack screw holes 233 and the outer screw mounting holes 241 to realize the fixed connection between the valve rod outer pipe 24 and the outer pipe 232 (i.e. one end of the outer pipe 24 is connected with the outer pipe 232). One end of the valve stem inner tube 25 is screwed to one end of the valve stem outer tube 24 (in this case, a part of the valve stem inner tube 25 is inserted into the valve stem outer tube 24). The probe positioning sleeve 26 is installed at the junction of the stem outer tube 24 and the stem inner tube 25, and has a probe positioning projection 261 formed thereon. The anti-rotation sleeve 27 is installed at the other end of the valve stem inner tube 25, and is formed with an anti-rotation sleeve boss 271 staggered with the probe positioning boss 261, and an anti-rotation groove is formed on the anti-rotation sleeve boss 271. The copper nut 272 is correspondingly installed at the other end portion of the rotation preventing sleeve 27 and allows the other end portion of the poppet valve rod 21 to be inserted thereinto.

The upper flange 20 comprises a disc body 201 and a convex block body 202 integrally formed on the surface of the disc body 201, flange grooves 203 at equal intervals are formed in the edge (namely, the peripheral surface) of the disc body 201, a central hole 204 penetrating through the disc body 201 and the convex block body 202 is formed in the center of the disc body 201 and the convex block body 202 (the central hole 204 forms an O-shaped ring groove adjacent to the outer end surface of the convex block body 202, and a retainer groove is further formed in the outer side of the O-shaped ring groove), an accommodating space (defined as an arc cabin and located on one side of the central hole 204) formed by inward recess of one end (namely, the outer end surface) far away from the disc body 201 in the convex block body 202 is defined as a flange surface (a plurality of inward recessed first threaded holes are formed in the flange surface). The upper flange 20 further includes an upper flange protrusion 206 integrally formed on the side surface of the boss body 202 and extending to the disk body 201, an anti-rotation guide plate 207 having one end connected to the upper flange protrusion 206, and a flange cover plate 205 installed on the flange surface of the disk body 201 (the flange cover plate 205 is provided with a plurality of threaded connection holes matched with the first threaded holes), and the anti-rotation guide plate 207 is provided with a limit groove. One end of the valve stem 21 correspondingly extends through the central bore 204.

The method of assembling the hydrant valve stem assembly described above comprises the steps of:

(1) assembling the pressure sensor:

(1a) preparing a lower valve clack 22 and a pressure sensor;

(1b) checking that the threaded opening of the lower valve clack 22 has no burrs or sharp objects; the pressure sensor checks whether a sealing ring is arranged or not and whether the thread end is intact or not;

(1c) the lower valve clack 22 is placed in position (the inner pipe body is upward), and the threaded end of the pressure sensor is screwed into the thread of the inner pipe body of the lower valve clack 22;

(1d) the lower valve clack 22 is pressed by a left hand, the pressure sensor is screwed by a torque wrench by a right hand, and the torque is 15N; attention needs to be paid to the fact that the sealing ring cannot be exposed when the pressure sensor is fastened;

(1e) and (5) self-checking the assembled semi-finished product, and flowing into the next procedure.

(2) Assembling a valve seat sealing plate:

(2a) preparing a valve seat sealing plate and an inner hexagon screw M4 x 20;

(2b) positioning and placing the pressing force sensor end of the lower valve clack 22 in the step (1) downwards, and aligning a hole in a sealing plate of a valve seat with a hole of the lower valve clack 22;

(2c) placing an inner hexagon screw into the hole, and fastening by using a pneumatic inner hexagon wrench;

(2d) placing the assembled valve seat sealing plate into a pressure measuring device, fastening, and carrying out water pressure test; when the water pressure is tested, the pressure is released after the pressure reaches 15Pa, and the interface of the pressure sensor is watertight;

(2e) and (5) self-checking the assembled semi-finished product, and flowing into the next procedure.

(3) Assembling the upper valve clack:

(3a) preparing the upper valve clack 23 and the inner hexagon screw M8 × 16;

(3b) placing the lower valve clack 22 in the step (2) with the pressing force sensor end upward, sleeving the upper valve clack 23 into the lower valve clack 22 and aligning the upper valve clack with the hole; the cable of the pressure sensor is led out of the upper valve flap 23;

(3c) placing an inner hexagon screw into the hole, and fastening by using a pneumatic inner hexagon wrench;

(3d) and (5) self-checking the assembled semi-finished product, and flowing into the next procedure.

(4) Assembling a valve rod outer pipe:

(4a) preparing the outer valve stem pipe 24, the inner hexagon screw M8 x 60 and the nut M8;

(4b) checking whether the orifice of the outer valve rod pipe 24 is free of burrs and sharp objects, placing the upper valve clack and the lower valve clack which are assembled in the step (3) upwards according to the upper valve clack 23, sleeving the outer valve rod pipe 24 in the upper valve clack 23, and enabling a cable of a pressure sensor to penetrate out of the outer valve rod pipe; a first hole at the lower end of the valve rod outer tube 24 is aligned with a hole of the upper valve clack 23, an inner hexagon screw is inserted into the hole and a nut is installed, the nut is fixed by taking an open spanner with the left hand, and the nut is fastened by taking a pneumatic inner hexagon spanner with the right hand;

(4c) and (5) self-checking the assembled semi-finished product, and flowing into the next procedure.

(5) Assembling a valve rod inner pipe:

(5a) preparing a valve rod inner pipe 25, a probe positioning sleeve 26, an inner hexagon screw M8 x 60 and a nut M8;

(5b) checking whether the orifice of the valve rod inner pipe 25 is free of burrs and sharp objects, placing the semi-finished product assembled in the step (4) upwards according to the upper valve rod outer pipe 24, sleeving the probe positioning sleeve 26 at one end of the valve rod outer pipe 24, which is far away from an upper valve clack, sleeving the valve rod inner pipe 25 into the valve rod outer pipe 24, aligning the hole of the probe positioning sleeve 26 with the uppermost hole of the valve rod outer pipe 24, aligning the lowermost hole of the valve rod inner pipe 25 with the holes of the valve rod outer pipe 24 and the probe positioning sleeve 25, inserting an inner hexagon screw into the hole and installing a nut, taking the spanner fixing nut with the left hand and taking the pneumatic inner hexagon spanner with the right hand for fastening, and thus fastening the probe positioning sleeve 26, the valve rod outer pipe 24 and the valve rod inner pipe 25 together; note that the pressure sensor cable is passed out of the valve stem inner tube 25;

(5c) and (5) self-checking the assembled semi-finished product, and flowing into the next procedure.

(6) Assembling the anti-rotation sleeve:

(6a) preparing the anti-rotation sleeve 27, the socket head cap screw M8 x 60 and the nut M8;

(6b) checking whether the orifice of the anti-rotation sleeve 27 is free of burrs and sharp objects, placing the semi-finished product in the step (5) upwards according to the valve rod inner pipe 25, leading out a cable of the pressure sensor from a threading hole (large hole) of the anti-rotation sleeve, aligning a connecting hole (small hole) of the anti-rotation sleeve 27 with the uppermost hole of the valve rod inner pipe 25, inserting an inner hexagon screw into the connecting hole and installing a nut;

(6c) the left hand holds the open spanner fixing nut and the right hand holds the pneumatic inner hexagon spanner for fastening, so that the anti-rotation sleeve 27 is fixedly connected with the valve rod inner tube 25;

(6d) and (5) self-checking the assembled semi-finished product, and flowing into the next procedure.

(7) Assembling an upper flange:

(71a) preparing the upper flange 20, the electrode holder M8 × 1.5, the valve stem 21, the orifice retainer, the O-ring 18 × 1.8, and the O-ring 34.5 × 3.55;

(71b) checking that the threaded port of the upper flange 20 has no burrs and sharp objects, placing the upper flange 20 upwards according to the flange surface, respectively placing 3 electrode holders into small O-shaped rings 18 x 1.8, correspondingly screwing the electrode holders into threaded holes (positioned in an arc cabin) of the upper flange 20, sleeving the electrode holders in the electrode holders by using a socket wrench for fastening, and fastening the electrode holders by using a torque wrench with a torque force of 50N;

(71c) the upper flange 20 is placed by turning 180 degrees, a large O-shaped ring 34.5 x 3.55 is placed in an inner hole of the upper flange 20, lubricating oil is applied to the valve rod 21 and placed into the inner hole of the flange, and the clamp spring is used for clamping one end of the elastic pad, which is provided with threads along the valve rod 21, and placing the end into the inner hole of the flange;

(72a) preparing waterproof wires (7P aviation head waterproof wire female-head opposite ends), probes (2L 148 and 1L 500), spring pads M6, anti-rotation guide plates 207, nuts M8 and hexagon socket head screws M8 x 55;

(72b) the threaded end of the assembled anti-rotation sleeve 27 is downwards connected with the valve rod 21 in a threaded mode (the anti-rotation sleeve 27 is screwed 3-4 circles when screwed into the valve rod 21), the anti-rotation guide plate 207 is installed, a limit groove at one end of the anti-rotation guide plate 207 is used for clamping the upper flange boss 206, the other end of the anti-rotation guide plate is placed at the anti-rotation sleeve boss 271, threaded holes (of the anti-rotation guide plate 207 and the upper flange boss 206) are kept aligned, and after M8 x 60 hexagon socket head screws are sleeved into the flat pad and the elastic pad, the nuts are screwed in through a pneumatic wrench;

(72c) screwing a threaded port of a pressure sensor cable into a flange thread, and fastening by using a torque wrench, wherein the torque is 15N;

(72d) loosening screws at the top end of the electrode holder by using a cross screwdriver, wherein 3 electrode probes are respectively in threaded connection with 3 electrode holders and are fastened by using an open spanner, and 2 longer probes penetrate into the probe positioning sleeve 26;

(72e) turning the upper flange for 180 degrees, putting the upper port of the electrode holder into the elastic pad, sequentially sleeving the yellow, white and red waterproof wires into the upper port of the electrode holder from left to right, screwing the waterproof wires into the nuts, and fastening the waterproof wires by using a socket wrench;

(72f) and (5) self-checking the assembled semi-finished product, and flowing into the next procedure.

(8) Pouring glue and sealing:

(8a) preparing a flange cover plate 205, a flange sealing gasket, AB glue and a flat cross screw;

(8b) sleeving a flange sealing gasket into the valve rod and aligning the flange sealing gasket with the threaded hole of the flange;

(8c) the organic silicon sealant (the commercial bi-component A, B sealant and the single-component organic silicon sealant do not need to be prepared) is prepared according to the proportion; pouring organosilicon sealant into the arc cabin by a glue pouring machine or manually until the height of the sealant is equal to the notch of the arc cabin, sleeving the flange cover plate 205 into the valve rod 21, and aligning the hole 208 of the flange cover plate with the hole of the flange sealing gasket and the threaded hole on the flange;

(8d) and screwing the flat head cross screw into the threaded hole by using a cross screwdriver and tightening.

And (4) carrying the assembled fire hydrant valve rod assembly to a general test workbench for testing.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.

Claims

1. A method of assembling a hydrant valve stem assembly comprising the steps of:

2. The method of assembling a hydrant valve assembly according to claim 1, wherein the pressure sensor is tightened by a torque wrench in step (1) with a torque force of 15N.

3. The method of assembling a hydrant valve assembly according to claim 1, wherein the sealing plate of the valve seat is connected to a pressure measuring device during the water pressure test in the step (2), and the pressure is released after the pressure reaches 15Pa, so that the water does not leak from the interface of the pressure sensor.