Quick release device and quick release method for piston for reciprocating pump

Abstract

The invention discloses a piston quick release device and method for a reciprocating pump. The piston quick release device comprises a piston cylinder body, a piston body is installed in the piston cylinder body, a power end rack is installed on one side of the piston cylinder body, and a connecting flange is installed on the other side of the piston cylinder body; wherein a crosshead part is fixedly installed in the power end rack, the movable end of the piston body is connected with one end of the crosshead part through a connecting body, and the other end of the crosshead part is connected with a connecting rod; and a plurality of detachable movable connecting pieces are arranged between the connecting flange and the power end rack along the radial direction of the piston body. The cylinder sleeve is arranged outside the rack, when the piston assembly is disassembled, the middle coupling is disassembled firstly, the piston assembly is pushed to enable the piston rod not to exceed the piston cylinder sleeve, operation is simple and easy, and the requirement can be met without using a hydraulic wrench or a large-torque torque wrench or using a common open-end wrench. The production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of reciprocating pump devices, and in particular to a quick-release device and a quick-release method for a piston of a reciprocating pump. Background Art

[0002] As an important component of the reciprocating pump, the piston assembly is crucial to the reliable operation of the reciprocating pump. Due to the reciprocating motion of the piston, long-term friction and heat generation will cause damage to the piston seal and guide belt. The piston seal and guide belt need to be replaced regularly to ensure the continued safe and reliable operation of the reciprocating pump unit. When replacing the piston seal and guide belt, most existing pump types set the piston and piston cylinder in the front cavity of the power end frame. Because the piston is installed in this cavity, it is time-consuming and laborious to disassemble the piston. At the same time, the piston guide rod and the crosshead tappet are relatively long, which increases the length of the front cavity and causes the rigidity of the power end frame to deteriorate. Summary of the invention

[0003] In view of the above-mentioned defects or shortcomings, an object of the present invention is to provide a quick-release device and a quick-release method for a piston of a reciprocating pump.

[0004] To achieve the above purpose, the technical solution of the present invention is:

[0005] A piston quick-release device for a reciprocating pump comprises: a piston cylinder body, a piston body is installed in the piston cylinder body, a power end frame is installed on one side of the piston cylinder body, and a connecting flange is installed on the other side; wherein a crosshead component is fixedly installed in the power end frame, the movable end of the piston body is connected to one end of the crosshead component through a connecting body, and the other end of the crosshead component is connected to a connecting rod; along the radial direction of the piston body, a plurality of detachable movable connecting parts are installed between the connecting flange and the power end frame.

[0006] The movable connecting piece includes: a short connecting screw connected to the connecting flange and a long connecting screw connected to the power end frame. The short connecting screw and the long connecting screw are connected by a transfer nut. The movable connecting piece connects the hydraulic end connecting flange, the piston cylinder body, and the power end frame together.

[0007] The piston cylinder body comprises: a cylinder sleeve, a support seat is installed at the connecting end surface of the cylinder sleeve and the connecting flange, a hydraulic oil chamber is arranged at the supporting seat and the end surface of the cylinder sleeve, and a fixing mechanism and a locking mechanism are installed at the connecting end surface of the cylinder sleeve and the connecting flange;

[0008] Wherein, the fixing mechanism comprises: a fixing bolt installed in the support seat for fixing the piston cylinder and the connecting flange; a pressure joint connected to the hydraulic oil chamber is installed on the side wall of the piston cylinder;

[0009] The locking mechanism includes: a first clamping bolt installed in the support seat, a spring is installed on the first clamping bolt, the spring is arranged in a hole of the support seat, and the clamping bolt is clamped and installed in the support seat through a connecting flange.

[0010] A positioning bolt installed in the support seat is used to position and connect the piston cylinder body and the hydraulic end connecting flange when installing the connecting flange.

[0011] The connecting end surface of the cylinder sleeve and the power end frame is installed with a jack screw mechanism, and the jack screw mechanism includes jack screws installed on the piston cylinder body and the power end frame. When the piston cylinder body is removed, the jack screw pushes the piston cylinder body out of the positioning stop of the front vertical plate of the power end frame.

[0012] The connecting body comprises an intermediate coupling, and two ends of the intermediate coupling are respectively connected to the piston body and the crosshead component through a half coupling and a second locking nut.

[0013] The half coupling comprises: a first coupling flange and a coupling mounting screw, the inner hole of the first coupling flange is processed with an internal thread, the coupling mounting screw is installed in the first coupling flange, and the two sides are welded to form a whole;

[0014] The intermediate coupling includes: an intermediate coupling support and a second coupling flange; the first coupling flange and the second coupling flange have the same size, external threads are processed on both sides of the intermediate coupling support, and after the two second coupling flanges are installed on the intermediate coupling support, they are adjusted to a suitable size, and the two second coupling flanges and the intermediate coupling support are welded as a whole.

[0015] The mounting hole of the coupling mounting screw and the mounting hole of the second coupling flange are installed with second fastening bolts for clamping and fixing.

[0016] The power end frame includes: a power end frame front vertical plate in contact with the piston body connection surface, and a power end frame suspension; wherein, the power end frame suspension is provided with a power end frame inspection port; the power end frame front vertical plate is provided with a power end frame piston flushing inlet, a power end frame top screw hole, and a power end frame oil drain port; the top screw is installed in the power end frame top screw hole, and the power end frame piston flushing inlet is provided with a piston flushing joint.

[0017] A quick-disassembly method for a piston quick-disassembly device for a reciprocating pump according to the claims, comprising:

[0018] 1) When the piston seal needs to be replaced, first turn the crankshaft so that the crosshead is at the rear dead center;

[0019] 2) From the power end frame side, disassemble the connecting end of the connecting body and the piston body to separate the piston body from the connecting body;

[0020] 3) Turn the crankshaft again to make the piston body in the middle position of the piston cylinder body, turn the crankshaft in the opposite direction to make the crosshead component in the rear dead center position again, tie the sling to the piston cylinder body and make the sling in a taut state, and remove the mounting parts on the piston cylinder body and the connecting flange;

[0021] 4) Remove the piston cylinder and piston body from the power end frame;

[0022] 5) After replacing the piston seal and guide belt, return the piston cylinder and piston body components to their original positions and complete the maintenance.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] The invention provides a piston quick-disassembly device and a quick-disassembly method for a reciprocating pump. The cylinder sleeve is arranged outside a frame, and a component connected to a crankshaft is installed at a movable end. When disassembling and overhauling is required, the piston sleeve can be lifted out by pressing through an oil filling port, loosening a fixing bolt, and pushing out a positioning groove with a push screw, so as to facilitate replacement and overhauling. A coupling is installed in the middle of a connecting device component. When disassembling the piston component, the middle coupling is first removed, and the piston component is pushed so that the piston rod does not extend beyond the piston sleeve. The device is simple and easy to operate, and does not require the use of a hydraulic wrench or a torque wrench with a large torque. The maximum specification of bolts that need to be tightened is no more than M20, and the requirement can be met by using an ordinary open-end wrench, so as to ensure that the piston rod is completely in the cylinder sleeve when the cylinder sleeve is lifted out as a whole. The invention makes the overhaul work fast and efficient, and reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a piston quick-release device for a reciprocating pump of the present invention;

[0026] Figure 2 It is a schematic diagram of the piston cylinder structure of the piston quick-release device for a reciprocating pump of the present invention;

[0027] Figure 3 It is a schematic diagram of the fixing mechanism of the piston cylinder of the piston quick-release device for a reciprocating pump of the present invention;

[0028] Figure 4 It is a schematic diagram of the locking mechanism of the piston cylinder of the piston quick release device for a reciprocating pump of the present invention;

[0029] Figure 5 It is a schematic diagram of the positioning mechanism of the piston cylinder of the piston quick-release device for a reciprocating pump of the present invention;

[0030] Figure 6 It is a side view of the connection flange of the piston quick-release device for a reciprocating pump of the present invention;

[0031] Figure 7 It is a side view of a power end frame of a piston quick-release device for a reciprocating pump of the present invention;

[0032] Figure 8 It is a schematic diagram of the structure of the connecting piece of the present invention;

[0033] Fig. 9 is a cross-sectional view of a connector of the present invention;

[0034] Fig.10 The utility model is a maintenance and installation diagram of a piston quick-disassembly device for a reciprocating pump of the present invention.

[0035] In the figure, 1—connecting flange; 2—short connecting screw; 3—piston cylinder; 4—adapter nut; 5—long connecting screw; 6—piston body; 7—top screw; 8—power end frame; 9—piston flushing joint; 10—connecting body; 11—cross head component; 12—tooling nut rod; 13—tooling screw nut; 3-1—cylinder sleeve 3-2—support seat; 3-3—fastening bolt; 3-4—first locking nut; 3-5—pressure joint; 3-6—first sealing member; 3-7—first wear-resistant belt; 3-8—second wear-resistant belt; 3-9—second sealing member; 3-10—first Three seals; 3-11—fourth seal; 3-12—fifth seal; 3-13—first compression spring; 3-14—spring; 3-15—positioning bolt; 3-16—hydraulic oil chamber; 6-1—piston rod; 10-1—half coupling; 10-2—intermediate coupling; 10-3—second fastening bolt; 10-4—second locking nut; 10-1-1—first coupling flange; 10-1-2—coupling mounting screw; 10-2-1—intermediate coupling support; 10-2-2—second coupling flange; 11-1—crosshead tappet. DETAILED DESCRIPTION

[0036] The present invention will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0037] like Figure 1 As shown, the present invention provides a piston quick-release device for a reciprocating pump, comprising: a piston cylinder 3, a piston body 6 is installed in the piston cylinder 3, a power end frame 8 is installed on one side of the piston cylinder 3, and a connecting flange 1 is installed on the other side; the piston cylinder 3 is arranged on the outside of the power end frame 8 to shorten the length of the frame.

[0038] Among them, a crosshead component 11 is fixedly installed in the power end frame 8, and the movable end of the piston body 6 is connected to one end of the crosshead component 11 through a connecting body 10, and the other end of the crosshead component 11 is connected to a connecting rod; the connecting rod is connected to the crankshaft.

[0039] Along the radial direction of the piston body 6, a plurality of movable connecting parts are installed between the connecting flange 1 and the power end frame 8. Specifically, a plurality of movable connecting parts are evenly arranged in the axial direction of the connecting flange 1, and the movable connecting parts are movably connected to the power end frame 8, which is convenient for removal and installation.

[0040] Exemplarily, the movable connecting part includes: a short connecting screw 2 connected to the connecting flange 1 and a long connecting screw 5 connected to the power end frame 8, the short connecting screw 2 and the long connecting screw 5 are connected by a connecting nut 4, and the movable connecting part connects the hydraulic end connecting flange 1, the piston cylinder 3, and the power end frame 8 together.

[0041] like Figure 2 As shown, the piston cylinder body 3 includes: a cylinder sleeve 3-1, a support seat 3-2 is installed on the end surface of the cylinder sleeve 3-1 connected to the connecting flange 1, and a hydraulic oil chamber 3-16 is provided on the end surface of the support seat 3-2 and the cylinder sleeve 3-1, and a fixing mechanism and a locking mechanism are respectively provided in the support seat 3-2; a top screw mechanism is installed on the end surface of the cylinder sleeve 3-1 connected to the power end frame 8:

[0042] Among them, Figure 3 As shown, the fixing mechanism includes: a fixing bolt 3-3 installed in the support seat 3-2 for fixing the piston cylinder 3 and the connecting flange 1; a pressure joint 3-5 connected to the hydraulic oil chamber 3-16 is installed on the side wall of the piston cylinder 3. When the hydraulic oil chamber 3-16 is filled with oil and pressurized by the pressure joint 3-5, the sealing is mainly ensured by the second seal 3-9 and the third seal 3-10, and the first wear-resistant belt 3-7 and the second wear-resistant belt 3-8 mainly play a guiding role.

[0043] In order to ensure the sealing of the entire device, ensure that the hydraulic end medium does not leak and prevent dust, in the present invention, a first seal 3-6, a first wear-resistant belt 3-7, a second wear-resistant belt 3-8, a second seal 3-9, a third seal 3-10, and a fourth seal 3-11 are installed between the support seat 3-2 and the cylinder liner 3-1, and a fifth seal 3-12 is installed between the end face of the cylinder liner 3-1 and the connecting flange 1.

[0044] like Figure 4As shown, the locking mechanism includes: a first clamping bolt 3-13 installed in the support seat 3-2, a spring 3-14 is installed on the first clamping bolt 3-13, and the spring 3-14 is set in the hole of the support seat 3-2. The clamping bolt 3-13 is installed in the support seat 3-2 through the connecting flange 1, and the cylinder sleeve 3-1, the support seat 3-2, and the spring 3-14 are connected together. In the installed state, the spring 3-14 is in a compressed state, the cylinder sleeve 3-1 and the support seat 3-2 have an axial gap in the hydraulic oil chamber 3-16, the fastening bolt 3-3 presses the cylinder sleeve 3-1, and the first locking nut 3-4 is locked on the installation surface of the hydraulic end connecting flange 1.

[0045] More preferably, if Figure 5 , 6 As shown, it also includes a positioning mechanism, which includes: a positioning bolt 3-15 installed in the support seat 3-2, and the positioning bolt 3-15 is used to first position and connect the piston cylinder body 3 and the hydraulic end connecting flange 1 together during installation.

[0046] Preferably, if Figure 7 As shown, a jackscrew mechanism is installed on the connecting end surface of the cylinder sleeve 3-1 and the power end frame 8, and the jackscrew mechanism includes a jackscrew 7 installed on the piston cylinder body 3 and the power end frame 8. When the piston cylinder body 3 is removed, the jackscrew 7 pushes the piston cylinder body 3 out of the positioning port of the power end frame 8.

[0047] like Figure 8 As shown, the connector 10 in the present invention comprises: an intermediate coupling 10-2, both ends of which are connected to the piston body 6 and the crosshead component 11 respectively through a half coupling 10-1 and a second locking nut 10-4.

[0048] Specifically, Figure 8 , 9 As shown, the half coupling 10-1 includes: a first coupling flange 10-1-1 and a coupling mounting screw 10-1-2, the inner hole of the first coupling flange 10-1-1 is processed with an internal thread, the coupling mounting screw 10-1-2 is installed in the first coupling flange 10-1-1, and the two sides are welded to form a whole.

[0049] The intermediate coupling 10-2 includes: an intermediate coupling support 10-2-1 and a second coupling flange 10-2-2. The sizes of the first coupling flange 10-1-1 and the second coupling flange 10-2-2 are completely consistent, external threads are processed on both sides of the intermediate coupling support 10-2-1, and after the two second coupling flanges 10-2-2 are installed on the intermediate coupling support 10-2-1 and adjusted to a suitable size, the two second coupling flanges 10-2-2 and the intermediate coupling support 10-2-1 are welded into a whole.

[0050] Furthermore, the second fastening bolts 10-3 are installed on the mounting holes of the coupling mounting screw 10-1-2 and the mounting holes of the second coupling flange 10-2-2 for clamping and fixing. The intermediate coupling 10-2 connects the two half couplings 10-1 through the second fastening bolts 10-3, and preferably, the second fastening bolts 10-3 are provided with anti-loosening devices.

[0051] The power end frame 8 includes: a power end frame front vertical plate 8-1 in contact with the connecting surface of the piston body 6, and a power end frame suspension 8-2; the power end frame front vertical plate 8-1 is provided with a positioning stop near the hydraulic end side for positioning the cylinder sleeve 3-1, ultimately ensuring that the coaxiality of the piston rod 6-1 and the crosshead tappet 11-1 meets the design requirements.

[0052] The power end frame suspension 8-2 is provided with a power end frame inspection port 8-3; the power end frame front vertical plate 8-1 is provided with a power end frame piston flushing inlet 8-4, a power end frame top screw hole 8-5, and a power end frame oil drain port 8-6; wherein the top screw 7 is installed in the power end frame top screw hole 8-5, the power end frame piston flushing inlet 8-4 is used to install the piston flushing joint 9 to flush the piston; the power end frame oil drain port 8-6 is used to discharge the oil for flushing the piston. The connecting device assembly 10 is installed in the power end frame suspension 8-2, and the power end frame inspection port 8-3 is set above the power end frame suspension 8-2.

[0053] It should be noted that in the present invention, the piston rod 6-1 and the crosshead tappet 11-1 are both provided with the same threaded holes to facilitate the interchangeability of the half coupling 10-1. The threaded holes are used to install the half coupling 10-1. After installation, the half coupling 10-1 is locked to the piston rod 6-1 or the crosshead tappet 11-1 with the locking nut 210-4.

[0054] The working process and replacement method of the present invention are:

[0055] Replace the piston seal:

[0056] 1) When the piston seal needs to be replaced, first rotate the crankshaft so that the crosshead component 11 is at the rear dead center;

[0057] 2) From the power end frame 8 side, disassemble the connection end of the connector 10 and the piston body 6, so that the piston body 6 and the connector 10 are separated;

[0058] Specifically, in the present invention, maintenance personnel can remove the second fastening bolt 10-3 on the side of the connecting member 10 close to the piston rod 6-1 through the power end maintenance port 8-3 to separate the half coupling 10-1 and the intermediate coupling 10-2 of the half coupling 10-1 on the side of the piston rod 6-1.

[0059] 3) Turn the crankshaft again to make the piston body 6 in the middle position of the piston cylinder body 3, turn the crankshaft in the opposite direction to make the crosshead component 11 in the rear dead center position again, tie the sling to the piston cylinder body 3 and make the sling in a taut state, and remove the positioning bolts 3-15 on the piston cylinder body 3 and the connecting flange 1;

[0060] Specifically, the sling is tied to the cylinder sleeve 3-1 of the piston cylinder body 3 to perform the tightening work.

[0061] 4) Connect the pressure connector 3-5 to the hydraulic pressure source to increase the oil pressure in the hydraulic oil chamber 3-16 to the required pressure value and maintain the pressure. At this time, loosen the first locking nut 3-4 and remove the fastening bolts 3-3 one by one.

[0062] 5) Manually slowly release the oil in the hydraulic oil chamber 3-16. At this time, the compression amount of the spring 3-14 gradually decreases, the axial clearance of the hydraulic oil chamber 3-16 gradually becomes zero, and the hydraulic pressure source is cut off.

[0063] 6) Use the jackscrew 7 to push the piston cylinder 3 and the piston body 6 out of the power end frame 8;

[0064] After completing the above steps, at this time, there is an axial gap between the hydraulic end connecting flange 1 and the support seat 3-2, and the short connecting screw 2 and the long connecting screw 5 are in a stress-free state. Remove the two groups of short connecting screws 2, the adapter nut 4, and the long connecting screw 5 on the upper side, and use the top screw 7 to push the piston cylinder 3 out of the positioning stop of the front vertical plate 8-1 of the power end frame, and use a sling to lift the piston cylinder 3 and the piston body 6 at the same time. After disassembly, the piston seal and the guide belt can be replaced.

[0065] 7) After replacing the piston seal and guide belt, return the piston cylinder 3 and piston body 6 to their original positions and complete the maintenance.

[0066] Specific steps:

[0067] After replacing the piston seal and guide belt, first assemble the piston cylinder 3 and the piston body 6 together, then install the piston cylinder 3 on the positioning stop of the front vertical plate 8-1 of the power end frame, and use the positioning bolts 3-15 to first connect the hydraulic end connecting flange 1 and the support seat 3-2 together.

[0068] Install the two sets of short connecting screws 2, adapter nuts 4, and long connecting screws 5 on the upper side. Install the fastening bolts 3-3 and locking nuts 1 3-4, connect the pressure joint 3-5 to the hydraulic pressure source, and maintain the pressure when the oil pressure in the hydraulic oil chamber 3-16 increases to the required pressure value. When the fastening bolts 3-3 are pressed against the cylinder sleeve 3-1, the locking nuts 1 3-4 are locked. At this time, the short connecting screws 2, adapter nuts 4, and long connecting screws 5 are under stress.

[0069] like Fig.10 As shown, install the tooling nut rod 12 and the tooling screw nut 13, move the piston body 6 toward the power end, make the half coupling 10-1 and the intermediate coupling 10-2 on one side of the piston rod 6-1 close to each other, then install the first fastening bolt 10-3 and fasteners, and the maintenance work is completed.

[0070] The characteristics of the present invention are:

[0071] (1) When disassembling the piston, there is no need to use a hydraulic wrench or a high-torque torque wrench. The maximum bolt size that needs to be tightened is no larger than M20, and an ordinary open-end wrench can meet the requirements.

[0072] (2) A piston quick-release device for a reciprocating pump can quickly disassemble the coupling to ensure that the piston rod is completely inside the cylinder sleeve when the cylinder sleeve is lifted out as a whole.

[0073] (3) During disassembly, only two sets of fasteners on the upper outside of the cylinder liner need to be removed, making maintenance work quick and efficient.

[0074] (4) The half couplings installed on the piston rod and the crosshead tappet are completely consistent, and the size of the coupling flange 2 is completely consistent with the size of the coupling flange 1, thereby improving the versatility and interchangeability of the parts.

[0075] (5) The device reduces the axial dimension of the power end frame suspension and enhances the rigidity of the power end frame.

[0076] (6) The piston cylinder is arranged on the outside of the power end frame, and there is sufficient space for maintenance.

[0077] It is obvious to those skilled in the art that the above-mentioned specific examples are only preferred embodiments of the present invention. Therefore, the improvements and changes that may be made by those skilled in the art to certain parts of the present invention still embody the principles of the present invention and achieve the purpose of the present invention, and all belong to the scope of protection of the present invention.

Claims

1. A piston quick release device for a reciprocating pump, characterized in that: include: A piston cylinder (3), wherein a piston body (6) is installed in the piston cylinder (3), a power end frame (8) is installed on one side of the piston cylinder (3), and a connecting flange (1) is installed on the other side; wherein a cross head component (11) is fixedly installed in the power end frame (8), the movable end of the piston body (6) is connected to one end of the cross head component (11) through a connecting body (10), and the other end of the cross head component (11) is connected to a connecting rod; along the radial direction of the piston body (6), a plurality of detachable movable connecting parts are installed between the connecting flange (1) and the power end frame (8).

2. The piston quick release device for a reciprocating pump according to claim 1, characterized in that: The movable connecting member comprises: a short connecting screw (2) connected to the connecting flange (1) and a long connecting screw (5) connected to the power end frame (8); the short connecting screw (2) and the long connecting screw (5) are connected via a transfer nut (4); and the movable connecting member connects the hydraulic end connecting flange (1), the piston cylinder (3) and the power end frame (8) together.

3. The piston quick release device for a reciprocating pump according to claim 1 or 2, characterized in that: The piston cylinder body (3) comprises: a cylinder sleeve (3-1), a support seat (3-2) is installed on the connecting end surface of the cylinder sleeve (3-1) and the connecting flange (1), a hydraulic oil chamber (3-16) is arranged on the end surface of the support seat (3-2) and the cylinder sleeve (3-1), and a fixing mechanism and a locking mechanism are installed on the connecting end surface of the cylinder sleeve (3-1) and the connecting flange (1); The fixing mechanism comprises: a fixing bolt (3-3) installed in the support seat (3-2) for fixing the piston cylinder (3) and the connecting flange (1); a pressure joint (3-5) connected to the hydraulic oil chamber (3-16) is installed on the side wall of the piston cylinder (3); The locking mechanism comprises: a first clamping bolt (3-13) installed in the support seat (3-2), a spring (3-14) installed on the first clamping bolt (3-13), the spring (3-14) being arranged in a hole of the support seat (3-2), and the clamping bolt (3-13) being clamped and installed in the support seat (3-2) through a connecting flange (1).

4. The piston quick release device for a reciprocating pump according to claim 3, characterized in that: A positioning bolt (3-15) is installed in the support seat (3-2), and the positioning bolt (3-15) is used to position and connect the piston cylinder body (3) and the hydraulic end connecting flange (1) when installing the connecting flange (1).

5. The piston quick release device for a reciprocating pump according to claim 3, characterized in that: A jack screw mechanism is installed on the end surface where the cylinder sleeve (3-1) is connected to the power end frame (8). The jack screw mechanism includes a jack screw (7) installed on the piston cylinder body (3) and the power end frame (8). When the piston cylinder body (3) is removed, the jack screw (7) pushes the piston cylinder body (3) out of the positioning stop of the front vertical plate (8-1) of the power end frame.

6. The piston quick-release device for a reciprocating pump according to claim 1 or 2, characterized in that: The connecting body (10) comprises an intermediate coupling (10-2), and the two ends of the intermediate coupling (10-2) are respectively connected to the piston body (6) and the crosshead component (11) through a half coupling (10-1) and a second locking nut (10-4).

7. The piston quick release device for a reciprocating pump according to claim 6, characterized in that: The half coupling (10-1) comprises: a first coupling flange (10-1-1) and a coupling mounting screw (10-1-2); the inner hole of the first coupling flange (10-1-1) is processed with an internal thread; the coupling mounting screw (10-1-2) is installed in the first coupling flange (10-1-1), and the two sides are welded to form a whole; The intermediate coupling (10-2) comprises: an intermediate coupling support (10-2-1) and a second coupling flange (10-2-2); the first coupling flange (10-1-1) and the second coupling flange (10-2-2) have the same size, external threads are processed on both sides of the intermediate coupling support (10-2-1), and after the two second coupling flanges (10-2-2) are installed on the intermediate coupling support (10-2-1), they are adjusted to a suitable size, and the two second coupling flanges (10-2-2) and the intermediate coupling support (10-2-1) are welded as a whole.

8. The piston quick release device for a reciprocating pump according to claim 7, characterized in that: A second fastening bolt (10-3) is installed on the mounting hole of the coupling mounting screw (10-1-2) and the mounting hole of the second coupling flange (10-2-2) for clamping and fixing.

9. The piston quick release device for a reciprocating pump according to claim 1, characterized in that: The power end frame (8) comprises: a power end frame front vertical plate (8-1) in contact with the connecting surface of the piston body (6), and a power end frame suspension (8-2); wherein the power end frame suspension (8-2) is provided with a power end frame inspection port (8-3); the power end frame front vertical plate (8-1) is provided with a power end frame piston flushing inlet (8-4), a power end frame top screw hole (8-5), and a power end frame oil drain port (8-6); the top screw (7) is installed in the power end frame top screw hole (8-5), and the power end frame piston flushing inlet (8-4) is provided with a piston flushing joint (9).

10. A quick-release method for a piston quick-release device for a reciprocating pump according to the claim, characterized in that: include: 1) When the piston seal needs to be replaced, first rotate the crankshaft so that the crosshead component (11) is at the rear dead center; 2) Disconnect the connecting end of the connecting body (10) and the piston body (6) from the power end frame (8) side, so that the piston body (6) and the connecting body (10) are separated; 3) Turn the crankshaft again to make the piston body (6) in the middle position of the piston cylinder body (3), turn the crankshaft in the opposite direction to make the crosshead component (11) in the rear dead center position again, tie the sling to the piston cylinder body (3) and make the sling in a taut state, and remove the mounting components on the piston cylinder body (3) and the connecting flange (1); 4) Remove the piston cylinder (3) and the piston body (6) from the power end frame (8); 5) After replacing the piston seal and guide belt, return the piston cylinder (3) and piston body (6) to their original positions and complete the inspection.

Images