Plunger pump assembly tool and plunger pump assembly method

Abstract

The invention relates to an assembly tool of a plunger pump and an assembly method of the plunger pump. The assembly tool comprises an assembly platform; the multiple supporting and positioning tools are sequentially arranged on the assembling platform in the length direction of the assembling platform, the supporting and positioning tools are movably arranged on the assembling platform in the length direction, each supporting and positioning tool comprises a supporting base and a positioning part, the positioning parts are used for supporting and positioning a cylinder body of a plunger pump, and the supporting bases are used for supporting and positioning the cylinder body of the plunger pump. The positioning part is movably arranged on the supporting seat in the height direction of the assembling platform; and the calibration piece is mounted on the assembly platform and is used for emitting calibration light extending along the length direction. By means of the technical scheme, the assembling tool can guarantee the coaxiality of the multiple cylinder bodies of the plunger pump, and then the air tightness and performance of the plunger pump are guaranteed.

Description

Technical Field

[0001] This disclosure relates to the field of plunger pump assembly technology, specifically to an assembly fixture for a plunger pump and an assembly method for a plunger pump. Background Technology

[0002] Cryogenic plunger pumps are mainly used for pressurizing and transporting cryogenic liquids, such as liquid nitrogen pressurization, LNG pressurization, and liquid hydrogen pressurization and transport.

[0003] In related technologies, since a plunger pump has multiple components connected sequentially along the axial direction (such as a hydraulic cylinder, an extension cylinder, and a cold-end cylinder), a crane is generally used to lift these components during the connection and assembly process. However, the lifting accuracy of the crane is low, which results in poor coaxiality between the cylinders of the plunger pump, which can easily affect the airtightness of the plunger pump and thus affect its performance. Summary of the Invention

[0004] The purpose of this disclosure is to provide an assembly fixture and assembly method for a plunger pump. The assembly fixture can ensure the coaxiality between multiple cylinders of the plunger pump, thereby ensuring the airtightness and performance of the plunger pump.

[0005] To achieve the above objectives, according to a first aspect of this disclosure, an assembly fixture for a plunger pump is provided, the assembly fixture comprising: an assembly platform; a plurality of support and positioning fixtures arranged sequentially on the assembly platform along its length direction, the support and positioning fixtures being movably disposed on the assembly platform along the length direction, the support and positioning fixtures including a support base and a positioning part, the positioning part being used to support and position the cylinder of the plunger pump, the positioning part being movably disposed on the support base along the height direction of the assembly platform; and a calibration element mounted on the assembly platform and used to emit calibration light extending along the length direction.

[0006] Optionally, the assembly fixture further includes a drive mechanism and a support assembly. The assembly platform is rotatably mounted on the support assembly. The drive mechanism is connected to the assembly platform and is used to drive the assembly platform to switch between a first state and a second state. In the first state, the assembly platform is arranged horizontally, and in the second state, the assembly platform is arranged vertically.

[0007] Optionally, the drive mechanism includes a drive motor and a meshing first gear and a second gear. The drive mechanism is disposed on the support assembly and is connected to the first gear in a transmission manner. The second gear has a semi-circular tooth structure and is arranged on the side of the assembly platform opposite to the support positioning fixture.

[0008] Optionally, the support assembly includes a column and at least one diagonal brace arranged at an angle to the column. The assembly platform is rotatably connected to the column. The assembly platform is provided with a support leg on the side away from the support positioning fixture. There are multiple support legs, and the support legs are telescopically arranged along the height direction.

[0009] Optionally, the assembly platform is provided with a plurality of slide rails extending along the length direction, and the support base is slidably connected to the slide rails; the positioning part is provided with a positioning groove, and the positioning part supports and positions the cylinder body through the positioning groove, wherein a locking screw is provided between the support base and the positioning part, the locking screw is arranged along the length direction and is used to selectively restrict the movement of the positioning part relative to the support base.

[0010] Optionally, the assembly fixture further includes a limiting structure, which includes two limiting pins. The two limiting pins are used to selectively stop on both sides of the support seat along the length direction, so as to selectively restrict the movement of the support seat relative to the slide rail.

[0011] Optionally, the positioning groove has a bottom wall surface, which is constructed as an arc-shaped surface for fitting against the cylinder body; or, the bottom wall surface includes a bottom surface and two side surfaces, which are spaced apart from each other in a direction away from the bottom surface, and the side surfaces are used to abut against the cylinder body; at least one mounting hole is provided on the end face of the positioning part away from the support seat, and the assembly fixture includes a locking bolt for detachably installing the cylinder body in the corresponding mounting hole.

[0012] Optionally, the plunger pump includes multiple cylinders, including hydraulic cylinders, each hydraulic cylinder having a lifting ring. The assembly platform is provided with a lifting mechanism, which includes an actuator and a lifting rope. The actuator enables the suspended end of the lifting rope to move along the length direction, and the suspended end is used to connect to the lifting ring.

[0013] According to a second aspect of this disclosure, a method for assembling a plunger pump is provided. The method uses the aforementioned plunger pump assembly fixture to assemble the plunger pump. The plunger pump includes multiple cylinder bodies and a transmission rod. The multiple cylinder bodies include a hydraulic cylinder body, an extension cylinder body, and a cold-end cylinder body. The assembly method includes the following steps: switching the assembly platform to a first state; connecting the hydraulic cylinder body and the extension cylinder body to the transmission rod respectively; sequentially installing the hydraulic cylinder body, the extension cylinder body, and the cold-end cylinder body onto corresponding support and positioning fixtures; adjusting the height of the corresponding positioning part so that the first flange hole of the hydraulic cylinder body, the second flange hole of the extension cylinder body, and the third flange hole of the cold-end cylinder body are coaxially arranged, and the calibration light emitted by the calibration component is aligned accordingly. The calibration light emitted by the calibration component passes through the first flange hole, the second flange hole, and the third flange hole again to complete the first calibration; the assembly platform is switched to the second state; the height position of the corresponding positioning part is adjusted so that the first flange hole of the hydraulic cylinder, the second flange hole of the extension cylinder, and the third flange hole of the cold end cylinder are coaxially arranged, and the calibration light emitted by the calibration component passes through the first flange hole, the second flange hole, and the third flange hole again to complete the second calibration; the corresponding support seat is slid to bring the hydraulic cylinder and the extension cylinder closer to each other, and to bring the extension cylinder and the cold end cylinder closer to each other; the hydraulic cylinder and the extension cylinder are connected using fasteners, and the extension cylinder and the cold end cylinder are connected using fasteners.

[0014] Optionally, the assembly method further includes: after "connecting the hydraulic cylinder body to the extension cylinder body using fasteners, and connecting the extension cylinder body to the cold end cylinder body using fasteners", lifting the plunger pump using a hoisting mechanism; placing a liquid nitrogen tank on the lower side of the plunger pump; lowering the plunger pump using the hoisting mechanism, so that the cold end cylinder body and at least a portion of the extension cylinder body are immersed in the liquid nitrogen tank; after a preset time, lifting the plunger pump using the hoisting mechanism, so that the cold end cylinder body and at least a portion of the extension cylinder body are detached from the liquid nitrogen tank; and applying a preset torque to the fasteners between the extension cylinder body and the cold end cylinder body.

[0015] Through the above technical solution, in the assembly fixture provided in this disclosure, multiple supporting and positioning fixtures are arranged sequentially along the length direction of the assembly platform. The positioning part of the supporting and positioning fixture is used to support and position the cylinder of the plunger pump. That is, multiple cylinders can be arranged sequentially on the assembly platform along the length direction using corresponding supporting and positioning fixtures. Furthermore, since the positioning part is movably mounted on the support seat along the height direction of the assembly platform, the position of multiple cylinders relative to the assembly platform along the height direction can be adjusted by adjusting the positioning part. This allows for adjustment of the height position of the flange holes on the cylinders. When calibration light passes through the respective flange holes of multiple cylinders simultaneously, the collinearity of the axes of the multiple cylinders can be ensured. In summary, the assembly fixture provided in this disclosure can ensure the coaxiality between the multiple cylinders of the plunger pump, thereby ensuring the airtightness and performance of the plunger pump.

[0016] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the assembly tooling provided in the embodiments of this disclosure in its first state; Figure 2 This is a schematic diagram of the assembly tooling provided in the embodiments of this disclosure in the second state; Figure 3 This is a partial structural schematic diagram of the assembly tooling provided in the embodiments of this disclosure; Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the positioning part provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram of the drive mechanism and support components provided in the embodiments of this disclosure; Figure 7 This is a flowchart of the assembly method of the plunger pump provided in the embodiments of this disclosure.

[0018] Explanation of reference numerals in the attached figures 100. Assembly platform; 110. Slide rail; 120. Support leg; 200. Cylinder body; 210. Hydraulic cylinder body; 220. Extension cylinder body; 230. Cold end cylinder body; 240. Transmission rod; 300. Support positioning fixture; 310. Support base; 320. Positioning part; 321. Positioning groove; 3211. Bottom surface; 3212. Side surface; 322. Mounting hole; 330. Locking screw; 400. Calibration component; 500. Drive mechanism; 510. Drive motor; 520. First gear; 530. Second gear; 600. Support assembly; 610. Column; 620. Diagonal brace; 700. Limiting structure; 710. Limiting pin; 800. Lifting mechanism; 810. Actuator; 820. Lifting rope; 900. Liquid nitrogen tank. Detailed Implementation

[0019] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0020] In this disclosure, unless otherwise stated, "length direction" refers to the direction indicated by reference numeral L1, and "height direction" refers to the direction indicated by reference numeral L2. The directional terms used, such as "top" and "bottom," refer to the "top" and "bottom" along the aforementioned height direction in the first state of this disclosure. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications. In addition, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements. The above definitions are for explanation and illustration only and should not be construed as limiting this disclosure.

[0021] According to a first aspect of this disclosure, an assembly fixture for a plunger pump is provided. The assembly fixture includes: an assembly platform 100; a plurality of support and positioning fixtures 300 arranged sequentially on the assembly platform 100 along the length direction of the assembly platform 100, wherein the support and positioning fixtures 300 are movably disposed on the assembly platform 100 along the length direction, and each support and positioning fixture 300 includes a support base 310 and a positioning part 320, wherein the positioning part 320 is used to support and position the cylinder body 200 of the plunger pump, and the positioning part 320 is movably disposed on the support base 310 along the height direction of the assembly platform 100; and a calibration element 400, mounted on the assembly platform 100, and used to emit calibration light extending along the length direction.

[0022] Through the above technical solution, in the assembly fixture provided in this disclosure, multiple support and positioning fixtures 300 are arranged sequentially along the length direction of the assembly platform 100. The positioning part 320 of the support and positioning fixture 300 is used to support and position the cylinder body 200 of the plunger pump. That is, multiple cylinder bodies 200 can be sequentially arranged on the assembly platform 100 along the length direction using corresponding support and positioning fixtures 300. Furthermore, since the positioning part 320 is movably disposed on the support base 310 along the height direction of the assembly platform 100, the position of multiple cylinder bodies 200 relative to the assembly platform 100 along the height direction can be adjusted by adjusting the positioning part 320. This allows for adjustment of the height position of the flange holes on the cylinder bodies 200. When calibration light simultaneously passes through the respective flange holes of multiple cylinder bodies 200, the collinearity of the axes of the multiple cylinder bodies 200 can be ensured. In summary, the assembly fixture provided in this disclosure can ensure the coaxiality between the multiple cylinder bodies 200 of the plunger pump, thereby ensuring the airtightness and performance of the plunger pump.

[0023] It should be noted that, as is well known to those skilled in the art, each cylinder block 200 has a flange with flange holes. When multiple cylinder blocks 200 are coaxially arranged, the flange holes on the multiple cylinder blocks 200 are also coaxially arranged. Therefore, by utilizing the movement of the support positioning fixture 300 along the height direction, in conjunction with the calibration light, this disclosure can make the flange holes of the multiple cylinder blocks 200 coaxially arranged, thereby ensuring the coaxiality between the multiple cylinder blocks 200 of the plunger pump. In addition, the multiple support positioning fixtures 300 can be located at the same position in the width direction of the assembly platform 100. Thus, there is no need to adjust the position of the support positioning fixture 300 relative to the assembly platform 100 in the width direction, thereby simplifying the assembly of the plunger pump. Furthermore, each cylinder block 200 is provided with at least two support positioning fixtures 300.

[0024] In the assembly tooling of the plunger pump provided in this disclosure, as an exemplary embodiment, reference is made to... Figure 1 , Figure 2 and Figure 6As shown, the assembly fixture may further include a drive mechanism 500 and a support assembly 600. The assembly platform 100 is rotatably mounted on the support assembly 600. The drive mechanism 500 can be driven to the assembly platform 100 and is used to drive the assembly platform 100 to switch between a first state and a second state. In the first state, the assembly platform 100 can be arranged horizontally, and in the second state, the assembly platform 100 can be arranged vertically. Since the axes of the multiple cylinders 200 are parallel to the platform surface of the assembly platform 100, when the assembly platform 100 is arranged horizontally, the axes of the multiple cylinders 200 are also arranged horizontally (or, in other words, the plunger pump is arranged horizontally); when the assembly platform 100 is arranged vertically, the axes of the multiple cylinders 200 are also arranged vertically (or, in other words, the plunger pump is arranged vertically). In summary, this assembly fixture can ensure the coaxiality of the multiple cylinders 200 of the plunger pump when it is arranged horizontally and vertically, respectively.

[0025] It should be noted that, as is well known to those skilled in the art, the axial length of some plunger pumps can reach 2m-3m, and some cylinders 200 of the plunger pump are equipped with sealing rings and transmission rods 240 as described below. When the assembly platform 100 is in the first state, the plunger pump is horizontally arranged, and the platform height is approximately 1m-1.5m. This facilitates the operator in calibrating the coaxiality of the multiple cylinders 200 of the plunger pump. However, in the first state, the transmission rod 240 will press against the sealing ring, causing the sealing ring to accumulate at the bottom of the corresponding cylinder 200. In other words, in the first state, the sealing ring is unevenly distributed along the circumference of the cylinder 200. When the assembly platform 100 is in the second state, the plunger pump is vertically arranged (i.e., the top of the plunger pump is approximately 2-3 meters from the ground). The transmission rod 240 will not press against the sealing ring. In other words, in the second state, the sealing ring will be evenly distributed along the circumference of the cylinder block 200. At this time, the coaxiality of multiple cylinder blocks 200 is checked using calibration light to ensure that the multiple cylinder blocks 200 are coaxially arranged before assembly. In summary, assembling multiple cylinder blocks 200 in the second state can eliminate the influence of uneven distribution of sealing rings on the coaxiality of the multiple cylinder blocks 200, thereby improving the assembly accuracy of the multiple cylinder blocks 200.

[0026] In the assembly fixture of the plunger pump provided in this disclosure, the drive mechanism 500 can be constructed in any suitable manner. As an exemplary embodiment, refer to... Figure 6As shown, the drive mechanism 500 may include a drive motor 510 and a meshing first gear 520 and a second gear 530. The drive mechanism 500 may be disposed on the support assembly 600 and drivenly connected to the first gear 520. The second gear 530 may be constructed with semi-circular teeth and arranged on the side of the assembly platform 100 opposite to the support positioning fixture 300. In this way, the output shaft of the drive motor 510 can drive the first gear 520 to rotate, so that the first gear 520 drives the second gear 530 to rotate synchronously, and then the second gear 530 drives the assembly platform 100 to rotate, so that the assembly platform 100 switches between a first state and a second state.

[0027] The first and second ends of the second gear 530 can be connected to the side end face of the assembly platform 100 along its width direction. Thus, when either the first or second end meshes with the first gear 520, the assembly platform 100 is in a second state; when the middle part of the second gear 530 meshes with the first gear 520, the assembly platform 100 is in a first state. Furthermore, the diameter of the second gear 530 can be larger than the diameter of the first gear 520. This ensures that when the first gear 520 and the second gear 530 rotate synchronously, the rotation angle of the second gear 530 is smaller than the rotation angle of the first gear 520, allowing the second gear 530 to drive the assembly platform 100 to rotate smoothly, thereby ensuring the stability of the assembly fixture.

[0028] In the assembly tooling of the plunger pump provided in this disclosure, the support assembly 600 can be constructed in any suitable manner. As an exemplary embodiment, refer to... Figure 1 , Figure 2 and Figure 6 As shown, the support assembly 600 may include a column 610 and at least one diagonal brace 620 arranged at an angle to the column 610. The assembly platform 100 is rotatably connected to the column 610. A support leg 120 may be provided on the side of the assembly platform 100 away from the support positioning fixture 300. There may be multiple support legs 120, which can be extended and retractable along the height direction. Each diagonal brace 620, column 610, and ground can form a triangular structure to ensure the stability of the support assembly 600, thereby ensuring the stability of the assembly platform 100. In addition, when the assembly platform 100 is in the first state, the support leg 120 can extend and support between the assembly platform 100 and the ground to further improve the stability of the assembly platform 100; when it is necessary to rotate the assembly platform 100, the support leg 120 can retract to avoid motion interference between the support leg 120 and the assembly platform 100. In addition, multiple support legs 120 can be arranged at intervals along the circumference of the assembly platform 100 to provide stable support for the entire circumference of the assembly platform 100.

[0029] The number of diagonal bracing columns 620 can be any suitable number. In one exemplary embodiment, there can be one diagonal bracing column 620, and the diagonal bracing column 620, the upright column 610, and the ground can form a right-angled triangle structure. In another exemplary embodiment, there can be two diagonal bracing columns 620, and the two diagonal bracing columns 620 can be symmetrically arranged on opposite sides of the upright column 610 to ensure balanced force on both sides of the upright column 610, thereby improving the stability of the support assembly 600. In addition, the assembly fixture can include two sets of support assemblies 600, and the two sets of support assemblies 600 can be symmetrically arranged on opposite sides of the assembly platform 100 along its own width direction. A pivot can be provided between the two sets of support assemblies 600, and the assembly platform 100 can be rotatably mounted on the pivot. In this way, the two sets of support assemblies 600 can provide stable support to both sides of the assembly platform 100 along its width direction, thereby improving the stability of the assembly platform 100.

[0030] In the assembly fixture of the plunger pump provided in this disclosure, the support and positioning fixture 300 can be installed in any suitable manner. As an exemplary embodiment, refer to... Figure 3 and Figure 4 As shown, the assembly platform 100 can be provided with multiple slide rails 110 extending along the length direction, and the support base 310 can be slidably connected to the slide rails 110. The positioning part 320 can be provided with a positioning groove 321, through which the positioning part 320 supports and positions the cylinder 200. A locking screw 330 can be provided between the support base 310 and the positioning part 320. The locking screw 330 can be arranged along the length direction and is used to selectively restrict the movement of the positioning part 320 relative to the support base 310. Since the slide rails 110 extend along the length direction, the support base 310 can drive the corresponding cylinder 200 to slide along the length direction through the positioning part 320. In this way, when installing multiple cylinders 200, only the support base 310 needs to be slid to make two adjacent cylinders 200 contact for assembly, saving time and effort. Based on the above description, the positioning part 320 is movably disposed on the support base 310 along the height direction of the assembly platform 100, and the locking screw 330 can pass through the support base 310 and the positioning part 320 along the length direction. Therefore, after the positioning part 320 is adjusted to the required position, the locking screw 330 can lock the positioning part 320 onto the support base 310 to ensure that the positioning part 320 and the cylinder 200 mounted on it can remain stationary relative to the support base 310. Furthermore, the multiple slide rails 110 can be arranged collinearly, ensuring that the projections of the axes of the multiple cylinders 200 on the assembly platform 100 are collinear. In other words, the above arrangement eliminates the need to adjust the position of the support positioning fixture 300 relative to the assembly platform 100 along the width direction.

[0031] In this disclosure, the slide rail 110 can be connected to the assembly platform 100 in any suitable manner. As an exemplary embodiment, reference is made to... Figure 3 As shown, multiple slide rails 110 can be bolted to the assembly platform 100, thus allowing for the separate fabrication of both the slide rails 110 and the assembly platform 100. In another exemplary embodiment, the multiple slide rails 110 can also be integrally formed with the assembly platform 100, thereby improving the connection stability between the slide rails 110 and the assembly platform 100. In other embodiments, the slide rails 110 can also be connected to the assembly platform 100 in other suitable ways, such as snap-fit, etc., and this disclosure does not impose specific limitations in this regard.

[0032] In the assembly tooling of the plunger pump provided in this disclosure, as an exemplary embodiment, reference is made to... Figure 3 As shown, the assembly fixture may further include a limiting structure 700, which includes two limiting pins 710. These pins 710 can selectively stop on both sides of the support base 310 along its length, selectively restricting the movement of the support base 310 relative to the slide rail 110. Thus, the limiting pins 710 can restrict the movement of the support base 310 relative to the assembly platform 100 along its length. When the support base 310 has slid to a suitable position, its position can be locked by the limiting pins 710, ensuring the stability of the support positioning fixture 300 and the cylinder 200 mounted on it during the rotation of the assembly platform 100. The assembly platform 100 may have multiple pin holes for installing the limiting pins 710, and these pin holes can be spaced apart along the length. This facilitates the worker locking the support base 310 at the required position.

[0033] In the assembly fixture for the plunger pump provided in this disclosure, the positioning part 320 can be constructed in any suitable manner. As an exemplary embodiment, refer to... Figure 5 As shown, the positioning groove 321 may have a bottom wall surface, which may be constructed as an arc-shaped surface for fitting against the cylinder body 200. Alternatively, the bottom wall surface may include a bottom surface 3211 and two side surfaces 3212, which may be spaced apart from each other in a direction away from the bottom surface 3211, and the side surfaces 3212 are used to abut against the cylinder body 200. At least one mounting hole 322 may be provided on the end face of the positioning part 320 away from the support base 310. The assembly fixture may include a locking bolt for detachably mounting the cylinder body 200 in the corresponding mounting hole 322. In this way, the bottom wall surface of the positioning groove 321 can contact at least a portion of the cylinder body 200 to support the cylinder body 200 and prevent the cylinder body 200 from shaking relative to the positioning part 320.

[0034] Furthermore, the cylinder body 200 may have a mounting portion, through which a locking bolt can pass and be securely installed in the mounting hole 322, to ensure that the cylinder body 200 can remain stationary relative to the corresponding positioning portion 320. The number of mounting portions can be two, and the two mounting portions can be symmetrically arranged on opposite sides of the cylinder body 200, corresponding to [reference needed]. Figure 5 As shown, the number of mounting holes 322 can also be two, and the two mounting holes 322 can be arranged on opposite sides of the bottom wall surface respectively. In this way, the two mounting parts of the cylinder body 200 can be fastened in the corresponding mounting holes 322 respectively, and the cylinder body between the two mounting parts can abut against the bottom wall surface of the positioning groove 321 to limit the cylinder body 200 from shaking relative to the positioning part 320.

[0035] In the assembly tooling of the plunger pump provided in this disclosure, as an exemplary embodiment, reference is made to... Figure 1 and Figure 2 As shown, the plunger pump may include multiple cylinder bodies 200, and the multiple cylinder bodies 200 may include hydraulic cylinder bodies 210. Each hydraulic cylinder body 210 may have a lifting ring. A lifting mechanism 800 may be provided on the assembly platform 100. The lifting mechanism 800 may include an actuator 810 and a lifting rope 820. The actuator 810 enables the suspended end of the lifting rope 820 to move along its length, and the suspended end is used to connect to the lifting ring. In this way, the actuator 810 can drive the hydraulic cylinder body 210 to move along its length via the lifting rope 820. After the multiple cylinder bodies 200 are assembled, the actuator 810 can drive the plunger pump to move along its length.

[0036] According to the second aspect of this disclosure, reference to Figure 7 As shown, an assembly method for a plunger pump is provided. This assembly method uses the aforementioned plunger pump assembly fixture to assemble the plunger pump. The plunger pump includes multiple cylinder bodies 200 and a transmission rod 240. The multiple cylinder bodies 200 include a hydraulic cylinder body 210, an extension cylinder body 220, and a cold-end cylinder body 230. The assembly method includes the following steps: Step S101: Switch the assembly platform 100 to the first state. At this time, the assembly platform 100 is arranged horizontally, which facilitates the placement of the hydraulic cylinder 210, the extension cylinder 220, and the cold end cylinder 230 on their respective support and positioning fixtures 300, and is beneficial for the subsequent installation of the hydraulic cylinder 210, the extension cylinder 220, and the cold end cylinder 230 with their respective positioning parts 320.

[0037] Step S102: Connect the hydraulic cylinder body 210 and the extension cylinder body 220 to the transmission rod 240 respectively.

[0038] Step S103: Install the hydraulic cylinder body 210, extension cylinder body 220, and cold-end cylinder body 230 sequentially onto the corresponding support positioning fixtures 300. At this time, the hydraulic cylinder body 210, extension cylinder body 220, and cold-end cylinder body 230 can be arranged sequentially at intervals along the length of the assembly platform 100. Since multiple slide rails 110 are collinear, as long as the hydraulic cylinder body 210, extension cylinder body 220, and cold-end cylinder body 230 are installed on the corresponding support positioning fixtures 300, it can be ensured that the axes of the hydraulic cylinder body 210, extension cylinder body 220, and cold-end cylinder body 230 are projected collinearly onto the plane of the assembly platform 100. In this step, locking bolts can be sequentially passed through the mounting portion of the cylinder body 200 and tightened in the corresponding mounting holes 322 to ensure that the cylinder body 200 is locked onto the corresponding support positioning fixture 300, preventing the cylinder body 200 from disengaging from the support positioning fixture 300 due to rotation of the assembly platform 100 in subsequent steps. After the multiple cylinder bodies 200 are installed with their corresponding support and positioning fixtures 300, the piston rod, piston, and other components are inserted into the extension cylinder body 220, and sealing rings are installed at both ends of the extension cylinder body 220. Furthermore, a limiting pin 710 is inserted on both sides of each support and positioning fixture 300 to ensure that the support and positioning fixture 300 remains stationary relative to the assembly platform 100. This prevents the support and positioning fixture 300 and the cylinder bodies 200 mounted on it from shaking relative to the assembly platform 100 during subsequent adjustments to the height of the positioning part 320 or rotation of the assembly platform 100, which would affect the installation accuracy of the plunger pump.

[0039] Step S104: Adjust the height of the corresponding positioning part 320 so that the first flange hole of the hydraulic cylinder body 210, the second flange hole of the extension cylinder body 220 and the third flange hole of the cold end cylinder body 230 are coaxially set, and make the calibration light emitted by the calibration component 400 pass through the first flange hole, the second flange hole and the third flange hole in sequence to complete one calibration. In this step, by observing whether there are calibration rays on the walls of the first flange hole, the second flange hole, and the third flange hole, it can be determined whether the hydraulic cylinder body 210, the extension cylinder body 220, and the cold end cylinder body 230 are coaxial. Specifically, by adjusting the corresponding positioning part 320 until calibration rays appear at the bottom of the walls of the first flange hole, the second flange hole, and the third flange hole, it can be ensured that the axes of the hydraulic cylinder body 210, the extension cylinder body 220, and the cold end cylinder body 230 are collinear in the height direction. Combined with the fact that the projections of the axes of the hydraulic cylinder body 210, the extension cylinder body 220, and the cold end cylinder body 230 on the plane of the assembly platform 100 are also collinear, it can be known that the hydraulic cylinder body 210, the extension cylinder body 220, and the cold end cylinder body 230 are coaxial at this time.

[0040] Step S105: Switch the assembly platform 100 to the second state. At this time, the axial direction of the transmission rod 240 coincides with the direction of gravity. That is, when the assembly platform 100 is in a vertical state, the influence of the gravity of the transmission rod 240 on the coaxiality of the multiple cylinders 200 can be eliminated. Specifically, when the assembly platform 100 is arranged horizontally, the direction of gravity of the transmission rod 240 is perpendicular to the axis of the extension cylinder 220. Therefore, the transmission rod 240 will apply pressure to the sealing ring of the extension cylinder 220, causing the sealing ring to accumulate at the bottom of the extension cylinder 220. When the assembly platform 100 is arranged vertically, the direction of gravity of the transmission rod 240 is parallel to the axis of the extension cylinder 220. Therefore, the transmission rod 240 no longer applies pressure to the sealing ring of the extension cylinder 220. At this time, the sealing ring can be evenly distributed along the circumference of the extension cylinder 220.

[0041] Step S106: Adjust the height of the corresponding positioning part 320 so that the first flange hole of the hydraulic cylinder body 210, the second flange hole of the extension cylinder body 220, and the third flange hole of the cold end cylinder body 230 are coaxially aligned. Then, ensure that the calibration light emitted from the calibration component 400 passes through the first flange hole, the second flange hole, and the third flange hole again to complete the secondary calibration. The method for determining whether the hydraulic cylinder body 210, the extension cylinder body 220, and the cold end cylinder body 230 are coaxial is the same as the method in step S104, and therefore will not be repeated here. This secondary calibration further verifies the coaxiality of the hydraulic cylinder body 210, the extension cylinder body 220, and the cold end cylinder body 230.

[0042] Step S107: Slide the corresponding support seat 310 to bring the hydraulic cylinder 210 and the extension cylinder 220 closer to each other, and bring the extension cylinder 220 and the cold end cylinder 230 closer to each other.

[0043] Step S108: Connect the hydraulic cylinder body 210 to the extension cylinder body 220 using fasteners, and connect the extension cylinder body 220 to the cold end cylinder body 230 using fasteners. In steps S107 and S108, first connect the lifting rope 820 and the lifting ring of the hydraulic cylinder 210. Then, pull out the limiting pin 710 of the support positioning fixture 300 corresponding to the hydraulic cylinder 210 so that the hydraulic cylinder 210 can slide along the length direction of the assembly platform 100 to approach the extension cylinder 220 until the end face of the hydraulic cylinder 210 is in contact with the end face of the extension cylinder 220. At this time, tighten the fasteners between the hydraulic cylinder 210 and the extension cylinder 220 to the preset torque. Then, pull out the limiting pin 710 of the support positioning fixture 300 corresponding to the extension cylinder 220 so that the hydraulic cylinder 210 and the extension cylinder 220 can slide along the length direction of the assembly platform 100 to approach the cold end cylinder 230 until the end face of the extension cylinder 220 is in contact with the end face of the cold end cylinder 230. At this time, tighten the fasteners between the extension cylinder 220 and the cold end cylinder 230 to the preset torque to complete the assembly of the plunger pump. After the plunger pump is assembled, compressed air is introduced to perform an airtightness test on the hydraulic cylinder body 210 and the cold-end cylinder body 230. The compressed air pressure used for the test is 1.25 times the design pressure of the plunger pump. If the test fails, the fasteners between the hydraulic cylinder body 210 and the extension cylinder body 220, and between the extension cylinder body 220 and the cold-end cylinder body 230, are tightened again, and the test is performed again. If the test still fails, the plunger pump is removed, and steps S101 to S108 are repeated until the test is passed.

[0044] Step S109: Lift the plunger pump using the hoisting mechanism 800. Before performing this step, first pull out the limit pin 710 of the support positioning fixture 300 corresponding to the cold end cylinder 230, then use the hoisting mechanism 800 to lift the assembled plunger pump upwards until the hydraulic cylinder 210 is in the pre-assembly position, and insert the limit pin 710 on both sides of the support positioning fixture 300 corresponding to the hydraulic cylinder 210.

[0045] Step S110: Install a liquid nitrogen tank 900 on the lower side of the plunger pump.

[0046] Step S111: Use the lifting mechanism 800 to lower the plunger pump, immersing the cold-end cylinder 230 and at least part of the extended cylinder 220 in the liquid nitrogen tank 900. Specifically, pull out the two side limit pins 710 of the support positioning fixture 300 corresponding to the hydraulic cylinder 210, and then use the lifting mechanism 800 to lower the plunger pump until the cold-end cylinder 230 and at least part of the extended cylinder 220 are immersed in the liquid nitrogen tank 900.

[0047] Step S112: After a preset time, the plunger pump is lifted using the hoisting mechanism 800, causing the cold-end cylinder 230 and at least part of the extended cylinder 220 to detach from the liquid nitrogen tank 900. In one exemplary embodiment, the preset time can be two hours. In other embodiments, other suitable times can be selected for the preset time, and this disclosure does not impose specific limitations on this.

[0048] Step S113: Apply a preset torque to the fasteners between the extension cylinder 220 and the cold-end cylinder 230. Specifically, a torque wrench can be used to tighten the fasteners between the extension cylinder 220 and the cold-end cylinder 230 to the preset torque. In one exemplary embodiment, the preset torque can be 370 N·m-380 N·m. In other embodiments, any suitable value can be used for the preset torque, and this disclosure does not impose specific limitations on this. After completing this step, the plunger pump is left to stand for 48 hours, and then a transmission test is performed on the plunger pump, and an airtightness test is performed on the cold-end cylinder 230. If the test fails, the fasteners between the extension cylinder 220 and the cold-end cylinder 230 are tightened again, and the test is performed again. If the test still fails, the plunger pump is removed, and steps S101 to S113 are repeated until the test is successful.

[0049] It should be noted that the assembly platform 100 in this disclosure has a flat surface, and the flatness of this surface can be any suitable value. As an exemplary embodiment, the flatness of this surface can be 0.05 mm, and the coaxiality of the multiple cylinders 200 of the plunger pump assembled using the above assembly method is approximately 0.02 mm to 0.07 mm. In other embodiments, the flatness of this surface can also be any suitable value, and this disclosure does not impose specific limitations on it.

[0050] When using the assembly fixture provided in this disclosure, firstly, the drive motor 510 is driven to put the assembly platform 100 into a first state. Then, multiple cylinders 200 are placed in corresponding positioning parts 320, so that the positioning groove 321 abuts against the outer surface of the cylinder 200, and the mounting part of the cylinder 200 corresponds to the mounting hole 322. The cylinder 200 is locked in the corresponding mounting hole 322 using locking bolts. Then, the support positioning fixture 300 corresponding to the multiple cylinders 200 is locked using limit pins 710 to prevent the support positioning fixture 300 from moving relative to the assembly platform 100 along the length direction. Secondly, the positioning parts 320 are adjusted to move the multiple cylinders 200 relative to the assembly platform 100 along the height direction until the calibration light simultaneously passes through the flange holes of the multiple cylinders 200. Thirdly, the drive motor 510 is driven to put the assembly platform 100 into a second state, and the positioning parts 320 are adjusted to move the multiple cylinders 200 relative to the assembly platform 100 along the height direction until the calibration light simultaneously passes through the flange holes of the multiple cylinders 200. Next, unlock the support and positioning fixture 300 of the hydraulic cylinder body 210, and move the hydraulic cylinder body 210 to contact the extension cylinder body 220 through the hoisting mechanism 800. At this time, install the hydraulic cylinder body 210 and the extension cylinder body 220. Then, unlock the support and positioning fixture 300 of the extension cylinder body 220, and move the hydraulic cylinder body 210 and the extension cylinder body 220 to contact the cold end cylinder body 230 through the hoisting mechanism 800. At this time, install the extension cylinder body 220 and the cold end cylinder body 230, and the assembly of the plunger pump can be completed.

[0051] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0052] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0053] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. An assembly tool for a plunger pump, characterized by The assembly tool comprises: an assembly platform; a plurality of support positioning tools arranged on the assembly platform in sequence along a length direction of the assembly platform, the support positioning tools being movably arranged on the assembly platform along the length direction, the support positioning tools comprising a support base and a positioning portion, the positioning portion being used for supporting and positioning a cylinder block of a plunger pump, the positioning portion being movably arranged on the support base along a height direction of the assembly platform; and a calibration member mounted on the assembly platform and used for emitting a calibration light ray extending along the length direction.

2. The assembly tool for a plunger pump according to claim 1, characterized in that, The assembly tool further comprises a driving mechanism and a support assembly, the assembly platform being rotatably mounted on the support assembly, the driving mechanism being in transmission connection with the assembly platform and being used for driving the assembly platform to switch between a first state and a second state; in the first state, the assembly platform is arranged horizontally, and in the second state, the assembly platform is arranged vertically.

3. The plunger pump assembly tool of claim 2, wherein, The driving mechanism comprises a driving motor and first and second gears in engagement, the driving mechanism being arranged on the support assembly and being in transmission connection with the first gear, the second gear being configured as a semicircular tooth and being arranged on a side of the assembly platform away from the support positioning tools.

4. The plunger pump assembly tool of claim 2, wherein, The support assembly comprises a stand and at least one inclined strut arranged at an angle with the stand, the assembly platform being rotatably connected to the stand, a side of the assembly platform away from the support positioning tools being provided with support legs, the number of the support legs being plural, the support legs being telescopically arranged along the height direction.

5. The assembly tool for a plunger pump according to any one of claims 1 to 4, characterized in that, The assembly platform is provided with a plurality of slide rails extending along the length direction, the support base being in sliding connection with the slide rails; the positioning portion is provided with a positioning groove, the positioning portion supporting and positioning the cylinder block through the positioning groove, wherein a locking screw is arranged between the support base and the positioning portion along the length direction and is used for selectively limiting the movement of the positioning portion relative to the support base.

6. The plunger pump assembly tool of claim 5, wherein, The assembly tool further comprises a limiting structure, the limiting structure comprising two limiting pins respectively used for selectively stopping on both sides of the support base along the length direction to selectively limit the movement of the support base relative to the slide rails.

7. The plunger pump assembly tool of claim 5, wherein, The positioning groove has a bottom wall surface, the bottom wall surface being configured as an arc surface used for abutting the cylinder block, or the bottom wall surface comprising a bottom surface and two side surfaces, the two side surfaces being away from each other along a direction away from the bottom surface, the side surfaces being used for abutting the cylinder block; a side end surface of the positioning portion away from the support base is provided with at least one mounting hole, the assembly tool comprising a locking bolt used for detachably mounting the cylinder block in the corresponding mounting hole.

8. The plunger pump assembly tool of claim 2, wherein, The plunger pump comprises a plurality of cylinder blocks, the plurality of cylinder blocks comprising a hydraulic cylinder block having a lifting ring, the assembly platform being provided with a lifting mechanism, the lifting mechanism comprising an actuating member and a lifting rope, the actuating member being capable of moving a suspension end of the lifting rope along the length direction, the suspension end being used for being connected to the lifting ring.

9. A method of assembling a plunger pump, characterized by The assembly method uses the assembly tool of the plunger pump of any one of claims 1-8 to assemble the plunger pump, the plunger pump comprising a plurality of cylinder bodies and a transmission rod, the plurality of cylinder bodies comprising a hydraulic cylinder body, an extension cylinder body, and a cold-end cylinder body, the assembly method comprising the following steps: Switching the assembly platform to a first state; Connecting the hydraulic cylinder body and the extension cylinder body to the transmission rod, respectively; Mounting the hydraulic cylinder body, the extension cylinder body, and the cold-end cylinder body to corresponding support positioning tools in sequence; Adjusting the height positions of the positioning portions corresponding to the positioning portions, so that the first flange hole of the hydraulic cylinder body, the second flange hole of the extension cylinder body, and the third flange hole of the cold-end cylinder body are coaxially arranged, and the calibration light emitted by the calibration piece passes through the first flange hole, the second flange hole, and the third flange hole in sequence to complete a calibration; Switching the assembly platform to a second state; Adjusting the height positions of the positioning portions corresponding to the positioning portions, so that the first flange hole of the hydraulic cylinder body, the second flange hole of the extension cylinder body, and the third flange hole of the cold-end cylinder body are coaxially arranged, and the calibration light emitted by the calibration piece passes through the first flange hole, the second flange hole, and the third flange hole again to complete a second calibration; Sliding the corresponding support seats to make the hydraulic cylinder body and the extension cylinder body close to each other, and make the extension cylinder body and the cold-end cylinder body close to each other; Connecting the hydraulic cylinder body and the extension cylinder body by using fasteners, and connecting the extension cylinder body and the cold-end cylinder body by using fasteners.

10. The method of assembling a plunger pump of claim 9, wherein, The assembly method further comprises, after "connecting the hydraulic cylinder body and the extension cylinder body by using fasteners, and connecting the extension cylinder body and the cold-end cylinder body by using fasteners", Lifting the plunger pump by using a lifting mechanism; Providing a liquid nitrogen barrel under the lower side of the plunger pump; Lowering the plunger pump by using the lifting mechanism, so that the cold-end cylinder body and at least part of the extension cylinder body are immersed in the liquid nitrogen barrel; After a preset time, lifting the plunger pump by using the lifting mechanism, so that the cold-end cylinder body and at least part of the extension cylinder body are separated from the liquid nitrogen barrel; Making the fasteners between the extension cylinder body and the cold-end cylinder body have a preset torque.

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