Axial limiting pump head assembly for screwing split plunger rod

Abstract

The invention discloses an axial limiting pump head assembly for screwing a split plunger rod, and belongs to the technical field of plunger pumps, the pump head assembly comprises a pump head and a pump body which are detachably connected, the plunger rod is arranged in the pump head and the pump body in a matched mode, the pump head and the pump body can be matched and separated in the axial direction of the plunger rod, and the plunger rod is arranged in the pump head and the pump body. A connecting piece is arranged on the periphery of the matching position of the pump head and the pump body, the connecting piece is provided with a ring body making contact with the pump head and the outer surface of the pump body, the ring body is provided with an opening, and a fastener is connected to the opening of the ring body and used for adjusting the size of the opening. According to the plunger pump, rapid assembly and disassembly of the pump head and the pump body can be achieved, safety and stability are achieved in the disassembly process, the material replacement efficiency is improved, and the cleaning and disinfection cost of the plunger pump is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of plunger pumps, and in particular relates to an axially limited pump head assembly for tightening a split plunger rod. Background Art

[0002] The plunger pump is an important device in the hydraulic system. It relies on the reciprocating motion of the plunger in the cylinder to change the solvent in the sealed working chamber to achieve oil suction and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow regulation. At present, the industry usually uses an integrated pump unit, in which the pump body and the pump head are fixedly connected. The plunger pump is difficult to disassemble and install. The process of disassembling and installing the plunger pump is time-consuming and laborious, and the labor cost is high. For some industries with high requirements for disinfection and washing, the complete disassembly and replacement of the plunger pump will also lead to increased production costs. For example, in the food or medical industry, once the plunger pump is completely disassembled, the parts in contact with the plunger pump need to be thoroughly disinfected. For this reason, a detachable plunger pump can deal with the above-mentioned problems.

[0003] For example, the patent with publication number CN113944625B discloses a new type of high-pressure plunger pump hydraulic end structure, which includes a bracket, a pump head, a plunger and a low-pressure water seal. Three groups of stuffing boxes and three groups of valve group assemblies are arranged in the bracket. The plunger is arranged on the low-pressure water seal and is slidably connected with the stuffing box. The reciprocating motion of the plunger can open or close the liquid inlet check valve and the liquid discharge check valve. The liquid discharge check valve includes a liquid discharge limit sleeve, a liquid discharge valve core and a liquid discharge spring. The liquid inlet check valve includes a liquid inlet limit sleeve, a first liquid inlet spring, a liquid inlet valve plate and a second liquid inlet spring. The utility model has timely opening and closing characteristics, can reduce vibration, reduce noise, and extend service life. However, in the prior art, the pump body is an integrated structure, and it is difficult to disassemble the plunger, which affects the production efficiency, assembly efficiency and disassembly efficiency. Summary of the invention

[0004] The object of the present invention is to provide an axially limited pump head assembly for tightening a split plunger rod, which can realize rapid material replacement and precise material delivery.

[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: an axial limit pump head assembly for tightening the split plunger rod, including: a detachably connected pump head and a pump body, a plunger rod is arranged in the pump head and the pump body, the pump head and the pump body can be matched and disengaged in the axial direction of the plunger rod, and the pump head and the pump body are provided with a connecting piece at the periphery of the matching part, and the connecting piece includes a ring body in contact with the pump head and the outer surface of the pump body. The detachable connection scheme of the pump head and the pump body can realize the rapid disassembly of the two and the replacement of the internal components, solve the problem of the difficulty of disassembly of the plunger pump and the cost of replacing the parts of the plunger pump, the ring body is arranged on the outside of the matching part of the pump head and the pump body, ensure the continuous and tight connection between the pump head and the pump body, and at the same time, the outer wall of the matching part of the pump head and the pump body is faced to the ring body to form an installation guide and support, accelerate the material replacement efficiency, and form a protection for the matching part of the pump head and the pump body through the ring body, which is conducive to protecting the assembly end of the pump head and the pump body.

[0006] Preferably, the ring body has an opening, and the connector also includes a fastener disposed at the opening, and the fastener is used to adjust the size of the opening. By adjusting the opening of the ring body, the internal contour of the ring body can be changed, which, on the one hand, is convenient for adapting to pump heads and pump bodies of different sizes, thereby increasing the scope of application of the connector. On the other hand, since the size of the opening is adjustable, that is, by expanding the opening, the ring body can be moved in and out from the side of the pump head and the pump body and fit together, which reduces the installation space required for the connector in the axial direction during the assembly and disassembly processes, reduces the difficulty of assembling the pump head and the pump body, and can avoid damage to the contact surface of the pump head and the pump body before the connector is positioned in the mating position; Since the opening size of the ring body is adjustable, that is, when the ring body is wrapped around the outer periphery of the connection between the pump head and the pump body, the opening size is continuously adjusted by the fasteners to reduce the contour of the ring body, thereby gradually clamping the ring body around the matching point between the pump head and the pump body, thereby reducing the initial positioning accuracy requirements for the connecting parts, reducing the possibility of wear between the connecting parts and the outer wall of the pump head and the pump body due to inaccurate assembly position, reducing the maintenance cost caused by the assembly process, and improving the assembly efficiency of the connecting parts while reducing wear.

[0007] Preferably, the ring body has protrusions on both sides of the opening, and the fastener includes a connecting rod and a clamp body, the connecting rod cooperates with the two protrusions and connects the clamp body, and the clamp body can adjust the spacing between the protrusions. The protrusions provide installation space for the connecting rod. During assembly, the spacing between the protrusions is adjusted by the adjusting member, so that the ring body is opened at the opening. At this time, the inner contour of the ring body becomes larger, and it can partially contact and cooperate with the outer wall of the pump head and the pump body at the matching position. At this time, the ring body as a whole surrounds the outside of the pump head. At this time, the spacing between the protrusions is shortened by the adjusting member, and the inner contour of the ring body is reduced, so that other positions of the ring body can contact and cooperate with the pump body and the pump head, so as to achieve the clamping of the pump head and the pump body and the sealing of the matching position.

[0008] Preferably, the plunger rod comprises a first rod body and a second rod body which are coaxially arranged. The first rod body and the second rod body are detachably connected in the axial direction, and an elastic member is arranged at a connection between the first rod body and the second rod body.

[0009] The plunger rod is segmented into a first rod body and a second rod body, and the first rod body and the second rod body can be axially disassembled, which realizes segmented manufacturing of the plunger rod, reduces the manufacturing difficulty of the plunger rod with a larger axial length, and realizes modular production; The first rod body is used to contact and convey materials. The detachable pump head and pump body are matched with the detachable plunger rod. Material replacement can be achieved only by disassembling and replacing the pump head and the first rod body, which improves the disassembly and assembly speed of material replacement. Since only the pump head and the first rod body are in contact with the conveyed material during the period when the plunger pump is conveying the medium, when the plunger pump needs to be cleaned and disinfected, only the pump head and the first rod body need to be disassembled and cleaned and disinfected, which shortens the time for cleaning the plunger pump after shutdown and reduces the difficulty of cleaning and disinfection. In addition, since there is no need to clean the plunger rod as a whole, the cost of cleaning and disinfecting the plunger pump is reduced. Preferably, the first rod body includes a plug-in section, the second rod body has a groove body at one end, the groove body has a groove bottom, the plug-in section includes a head that is threadedly matched with the groove body, and there is a chamber between the head and the groove bottom, and the elastic member can be squeezed by the head and the groove bottom in the chamber. The first rod body realizes an assembled connection with the second rod body through the threaded match between the head and the groove body, and the threaded match method improves the coaxiality of the assembly of the first rod body and the second rod body, which is conducive to ensuring the stability of the position of the axis of the first rod body in the pump head, thereby improving the oil film characteristics of the first rod body and improving the stability of material transportation; There is a chamber between the bottom of the groove and the head. During the process of the head being screwed into the groove body through threaded engagement, the head and the bottom of the groove approach and squeeze the elastic member located in the chamber. At this time, the elastic member generates a force on the head and the bottom of the groove through deformation. This force causes the head and the bottom of the groove to be relatively separated, thereby enabling the head and the groove body to be pre-tightened at the threaded engagement, which is beneficial to improving the tightness and stability of the assembly of the head in the groove body, reducing the possibility of loosening at the threaded engagement due to interference generated by axial movement, resulting in axial runout of the first rod body and the second rod body, ensuring the movement stability of the contact part of the first rod body with the medium, thereby improving the flow stability and accuracy of the material transported by the pump head, and preventing the first rod body and the second rod body from being pulled by the first rod body due to relative displacement of the first rod body and the second rod body when the plunger rod reciprocates, thereby reducing vibration interference on the power end connected to the second rod body.

[0010] The head limits the screw-in direction by squeezing the elastic part with the bottom of the groove, which helps to prevent the head from excessively rotating and causing wear at the threaded joint, reducing maintenance costs. At the same time, it avoids the possibility of wear debris generated at the threaded connection due to side interference, which may cause the head and the groove body to be unable to separate normally, thereby improving the success rate and difficulty of segmented disassembly of the plunger rod.

[0011] Preferably, the outer wall of the head has a step that converges inwards, and the elastic member cooperates with the step, so that the elastic member can deform in the direction in which the head enters the slot body. When the head is screwed into the slot body and approaches the bottom of the slot, the head cooperates with the elastic member through the step, reducing the possibility of position displacement of the elastic member in the cavity during the compression deformation process, ensuring that the elastic member deforms in the direction in which the head is screwed in. On the one hand, it prevents the elastic member from moving due to local extrusion force, causing it to lose its tensioning effect on the threaded connection, thereby improving the tightness of the threaded connection. On the other hand, it stabilizes the direction in which the head is subjected to the force of the elastic member, so that the internal and external threads at the threaded matching point are subjected to a stable pre-tightening effect, thereby improving the contact tightness, reducing the possibility of thread wear, and reducing maintenance costs.

[0012] Preferably, the first rod body further comprises a conveying section, one end of which is connected to an end of the plug-in section away from the second rod body.

[0013] Preferably, a groove is provided on the outer wall of one end of the plug-in section away from the second rod body, and the grooves are evenly arranged on the outer wall surface of the plug-in section. The provision of the groove makes the outer wall of the plug-in section away from the second rod body not smooth, increases the friction of the outer wall, reduces the risk of slipping when the plug-in section is axially twisted, facilitates the separation of the first rod body and the second rod body, and improves the disassembly efficiency.

[0014] Preferably, the plug-in section also includes a socket, one end of the socket is connected to the conveying section, and the other end of the socket is connected to the head. The socket and the head are designed as an integrated unit, and one end of the socket connected to the conveying section has a jack, and the conveying section is assembled with the jack.

[0015] Preferably, the pump head and the pump body have a channel, the first rod body cooperates in the channel and can rotate axially, the first rod body can be separated from the second rod body along its axis, and at least one of the pump head and the pump body is provided with an operation hole on the outer wall, and the operation hole is connected to the channel. Since the first rod body and the second rod body are connected by threaded cooperation at the end, after the pump head and the pump body lose the restriction of the connecting piece, the first rod body and the second rod body can be rotated along the axial direction through the operation hole, so that the head is screwed out of the groove body, eliminating the restriction of the first rod body and the second rod body in the radial and axial directions, at this time, the radial separation of the pump head relative to the pump body can synchronously realize the radial separation of the first rod body and the second rod body, on the one hand, the moving distance of the pump head along the axial direction of the plunger rod is reduced when disassembling, the safety of disassembling the pump head is improved, and the disassembly efficiency is improved, and on the other hand, the lateral interference of the pump head on the plunger rod due to shaking during the axial movement is reduced, which is conducive to reducing the risk of damage or deformation of the plunger rod, reducing the cost of replacing parts, and reducing the maintenance cost of the pump head and the plunger rod.

[0016] The present invention has the following beneficial effects due to the use of a pump head and a first rod body that can be synchronously disengaged radially: the inner contour of the ring body can be changed by adjusting the opening, so as to facilitate the adaptation of pump heads and pump bodies of different sizes; the ring body can be fitted to the outside of the pump body and the pump head from the side through the opening, so as to reduce the damage of the contact surface of the pump head and the pump body caused by axial movement; the detachable pump head and the pump body are combined with the detachable plunger rod, so as to increase the speed of replacing materials; the segmented detachable first and second rod bodies reduce the cost of cleaning and disinfecting the plunger rod; the elastic member realizes the tensioning of the threaded fitting, so as to reduce the axial runout between the rod bodies and reduce the thread wear The head squeezes the elastic part to limit the screw-in depth, preventing excessive screwing from generating debris and causing inability to disengage. The step setting stabilizes the position and posture of the elastic part, allowing the thread to be clamped evenly at each position, further reducing the possibility of thread wear. The operating hole provides an external operating space for the rod to rotate and disengage, allowing the pump head to carry the first rod and the second rod to disengage radially, shortening the axial movement distance of the pump head and improving the safety of disassembly. The pump head and the first rod are synchronously disengaged radially, reducing the possibility of lateral interference of the axial movement of the pump head on the plunger rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the pump head assembly according to the first embodiment of the present invention; Figure 2 A top view of a pump head assembly according to Embodiment 1 of the present invention; Figure 3 for Figure 2 Sectional view of the middle AA plane; Figure 4 is a schematic diagram of the connection between the first rod body and the second rod body; Figure 5 is a cross-sectional view of the first rod body and the second rod body; Figure 6 This is a schematic diagram of the structure of a connector according to the first embodiment of the present invention; Figure 7 It is a cross-sectional view of a pump head assembly according to Embodiment 2 of the present invention; Figure 8 This is a schematic diagram of the connecting piece structure of the second embodiment of the present invention.

[0018] Reference numerals: pump head 1; pump body 2; plunger rod 3; first rod body 31; plug-in section 311; delivery section 312; second rod body 32; groove body 321; connecting member 4; ring body 41; connecting rod 42; clamping body 43; elastic member 5. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described in detail below in conjunction with specific implementations and drawings: Obviously, the described embodiments are only some embodiments of the present invention, not all 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 scope of protection of the present invention.

[0020] See attached Figure 1 -Attached Figure 3 , an axially limited pump head assembly for tightening a split plunger rod 3, comprising: a detachably connected pump head 1 and a pump body 2, the pump head 1 and the pump body 2 are equipped with a plunger rod 3, the pump head 1 and the pump body 2 can be matched and disengaged in the axial direction of the plunger rod 3, and the pump head 1 and the pump body 2 are provided with a connecting piece 4 on the periphery of the matching part, and the connecting piece 4 includes a ring body 41 in contact with the outer surface of the pump head 1 and the pump body 2.

[0021] The detachable connection scheme between the pump head 1 and the pump body 2 can realize the rapid disassembly of the two and the replacement of their internal components, solving the problem of the difficulty in disassembling the plunger pump and the cost of replacing the plunger pump parts. The ring body 41 is arranged on the outside of the matching point of the pump head 1 and the pump body 2 to ensure the continuous and tight connection between the pump head 1 and the pump body 2. At the same time, the outer wall of the matching point of the pump head 1 and the pump body 2 is used to form an installation guide and support for the ring body 41, which speeds up the material replacement efficiency. The protection of the matching point of the pump head 1 and the pump body 2 is formed by the ring body 41, which is beneficial to protect the assembly end of the pump head 1 and the pump body 2.

[0022] The ring body 41 has an opening, and the connecting member 4 further includes a fastener disposed at the opening, and the fastener is used to adjust the size of the opening.

[0023] By adjusting the opening of the ring body 41, the internal contour of the ring body 41 can be changed. On the one hand, it is easy to adapt to pump heads 1 and pump bodies 2 of different sizes, thereby increasing the applicable scope of the connector 4. On the other hand, since the size of the opening is adjustable, that is, by expanding the opening, the ring body 41 can be moved in and out from the side of the pump head 1 and the pump body 2 and fit together, thereby reducing the installation space required for the connector 4 in the axial direction during the assembly and disassembly processes, thereby reducing the difficulty of assembling the pump head 1 and the pump body 2, and avoiding damage to the contact surface of the pump head 1 and the pump body 2 before the connector 4 is positioned at the fitting position. Since the opening size of the ring body 41 is adjustable, that is, when the ring body 41 is wrapped around the outer periphery of the connection between the pump head 1 and the pump body 2, the opening size is continuously adjusted by the fasteners to reduce the inner contour of the ring body 41, thereby achieving gradual clamping of the ring body 41 at the outer periphery of the matching point between the pump head 1 and the pump body 2, thereby reducing the initial positioning accuracy requirements for the connecting piece 4, and reducing the possibility of wear between the connecting piece 4 and the outer wall of the pump head 1 and the pump body 2 due to inaccurate assembly position, thereby reducing the maintenance cost brought by the assembly process, and reducing wear while also improving the assembly efficiency of the connecting piece 4.

[0024] See attached Figure 6The ring body 41 has protrusions located on both sides of the opening, and the fastener includes a connecting rod 42 and a clamp body 43. The connecting rod 42 cooperates with the two protrusions and connects the clamp body 43. The clamp body 43 can adjust the distance between the protrusions.

[0025] The protrusions provide installation space for the connecting rod 42. During assembly, the spacing between the protrusions is adjusted by adjusting the adjustment member so that the ring body 41 is opened at the opening. At this time, the internal contour of the ring body 41 becomes larger, and can partially contact and cooperate with the outer wall of the pump head 1 and the pump body 2 at the matching point. At this time, the ring body 41 as a whole surrounds the outside of the pump head 1. At this time, the spacing between the protrusions is shortened by the adjustment member, and the internal contour of the ring body 41 is reduced, so that other positions of the ring body 41 can contact and cooperate with the pump body 2 and the pump head 1, thereby realizing the clamping of the pump head 1 and the pump body 2 and the sealing of the matching point.

[0026] One end of the connecting rod 42 is connected to one of the protrusions, and the other end of the connecting rod 42 can pass through the two protrusions and be connected to the clamping body 43 . The clamping body 43 is rotatably connected to the connecting rod 42 .

[0027] The clamp body 43 is an arc-shaped plate structure and has an arc surface, which can fit with the outer surface of the ring body 41. When the arc surface of the clamp body 43 fits with the outer surface of the ring body 41, the distance between the two protrusions of the ring body 41 is reduced. Specifically, the fit between the clamp body 43 and the surface of the ring body 41 will cause the clamp body 43 to rotate relative to the connecting pin, and when the arc-shaped clamp body 43 is displaced, it will drive the connecting pin at its end to displace together. In this process, the displacement of the connecting pin causes the distance between the two protrusions to decrease, thereby controlling the reduction of the inner contour of the ring body 41, so that the clamping tightness of the ring body 41 relative to the first pump body 2 and the second pump body 2 changes.

[0028] In certain usage scenarios, the connection tightness between the pump head 1 and the pump body 2 can be observed through the opening between the two protrusions, which solves the problem that the connection between the pump head 1 and the pump body 2 is difficult to observe when the connecting piece 4 is installed, facilitates timely adjustments by staff, and reduces safety hazards of leakage.

[0029] See attached Figure 4 -Attached Figure 5 The plunger rod 3 includes a first rod body 31 and a second rod body 32 which are coaxially arranged. The first rod body 31 and the second rod body 32 are detachably connected in the axial direction. An elastic member 5 is provided at the connection between the first rod body 31 and the second rod body 32.

[0030] The plunger rod 3 is segmented into a first rod body 31 and a second rod body 32, and the first rod body 31 and the second rod body 32 can be axially disassembled, which realizes segmented manufacturing of the plunger rod 3, reduces the manufacturing difficulty of the plunger rod 3 with a large axial length, and realizes modular production; The first rod body 31 is used to contact and convey materials. The detachable pump head 1 and pump body 2 are matched with the detachable plunger rod 3. Material replacement can be achieved by only disassembling and replacing the pump head 1 and the first rod body 31, which improves the disassembly and assembly speed of replacing materials. Since only the pump head 1 and the first rod body 31 are in contact with the conveyed material during the period when the plunger pump is conveying the medium, when the plunger pump needs to be cleaned and disinfected, only the pump head 1 and the first rod body 31 need to be disassembled and cleaned and disinfected, which shortens the time for cleaning the plunger pump after shutdown and reduces the difficulty of cleaning and disinfection. In addition, since there is no need to clean the plunger rod 3 as a whole, the cost of cleaning and disinfecting the plunger pump is reduced. The first rod body 31 includes an inserting section 311, and the second rod body 32 has a groove body 321 at one end. The groove body 321 has a groove bottom. The inserting section 311 includes a head threadedly matched with the groove body 321, and there is a cavity between the head and the groove bottom. The elastic member 5 can be squeezed by the head and the groove bottom in the cavity.

[0031] The elastic member 5 includes but is not limited to a cylindrical spring, and two ends of the cylindrical spring are squeezed by the head and the groove bottom respectively.

[0032] The first rod body 31 realizes the assembled connection with the second rod body 32 through the threaded cooperation between the head and the groove body 321, and the threaded cooperation method improves the coaxiality of the assembly of the first rod body 31 and the second rod body 32, which is conducive to ensuring the stability of the position of the axis of the first rod body 31 in the pump head 1, thereby improving the oil film characteristics of the first rod body 31 and improving the material transportation stability; There is a chamber between the bottom of the groove and the head. During the process of the head being screwed into the groove body 321 through threaded engagement, the head and the bottom of the groove approach and squeeze the elastic member 5 located in the chamber. At this time, the elastic member 5 generates a force on the head and the bottom of the groove through deformation. This force makes the head and the bottom of the groove relatively far apart, so that the head and the groove body 321 are pre-tightened at the threaded engagement, which is beneficial to improving the tightness and stability of the head assembly in the groove body 321, reducing the possibility of loosening of the threaded engagement due to interference caused by axial movement, resulting in axial runout of the first rod body 31 and the second rod body 32, ensuring the movement stability of the contact part of the first rod body 31 with the medium, thereby improving the flow stability and accuracy of the material transported by the pump head 1, and preventing the first rod body 31 from axially displacing relative to the second rod body 32 when the plunger rod 3 reciprocates, resulting in the first rod body 31 and the second rod body 32 pulling each other, causing the power end connected to the second rod body 32 to be subject to vibration interference.

[0033] The head limits the screwing direction by squeezing the elastic member 5 with the bottom of the groove, which helps to prevent the head from excessively rotating and causing wear at the threaded joint, reducing maintenance costs. At the same time, it avoids the possibility of wear debris generated at the threaded connection due to side interference, which may cause the head and the groove body 321 to be unable to separate normally, thereby improving the success rate and difficulty of segmented disassembly of the plunger rod 3.

[0034] The outer wall surface of the head has a step that converges inwards, and the elastic member 5 cooperates with the step. The elastic member 5 can be deformed along the direction in which the head enters the groove body.

[0035] When the head is screwed into the groove body 321 and approaches the bottom of the groove, the head cooperates with the elastic part 5 through the step, reducing the possibility of position displacement of the elastic part 5 in the cavity during the compression deformation process, ensuring that the elastic part 5 is deformed along the screw-in direction of the head. On the one hand, it avoids the elastic part 5 from moving due to local extrusion force, causing it to lose its tensioning effect on the threaded connection, thereby improving the tightness of the threaded connection. On the other hand, it stabilizes the direction in which the head is acted upon by the elastic part 5, so that the internal thread and the external thread at the threaded matching point are subjected to a stable pre-tightening effect, thereby improving the contact tightness, reducing the possibility of thread wear, and reducing maintenance costs.

[0036] The first rod body 31 also includes a conveying section 312, one end of which is connected to an end of the plug-in section 311 away from the second rod body 32, and the other end of the conveying section 312 can contact the medium. The end of the second rod body 32 away from the elastic member 5 is connected to a power structure, which is used for the axial reciprocating movement of the second rod body 32.

[0037] A groove is provided on the outer wall of the end of the plug section 311 away from the second rod body 32, and the grooves are evenly arranged on the outer wall surface of the plug section 311. The provision of the groove makes the outer wall of the plug section 311 away from the second rod body 32 not smooth, thereby increasing the friction of the outer wall, reducing the risk of slipping when the plug section 311 is axially twisted, facilitating the separation of the first rod body 31 and the second rod body 32, and improving the disassembly efficiency.

[0038] The plug section 311 also includes a socket, one end of which is connected to the conveying section 312, and the other end of the socket is connected to the head, so that the conveying section 312 can contact the medium. The socket and the head are designed as an integrated unit, and one end of the socket connected to the conveying section 312 has a socket, and the conveying section 312 is assembled with the socket.

[0039] The pump head 1 and the pump body 2 have a channel, the first rod body 31 cooperates in the channel and can rotate axially, the first rod body 31 can be separated from the second rod body 32 along its axis, and at least one of the pump head 1 and the pump body 2 has an operating hole on the outer wall, and the operating hole connects the channel. Since the first rod body 31 and the second rod body 32 are connected by threaded cooperation at the end, after the pump head 1 and the pump body 2 lose the restriction of the connecting piece 4, the first rod body 31 and the second rod body 32 can be rotated along the axial direction through the operating hole, so that the head can be screwed out in the groove body 321, eliminating the radial and axial restrictions of the first rod body 31 and the second rod body 32. At this time, the radial separation of the pump head 1 relative to the pump body 2 can synchronously achieve the radial separation of the first rod body 31 and the second rod body 32, on the one hand, reducing the axial movement distance of the pump head 1 along the plunger rod 3 during disassembly, improving the safety of disassembling the pump head 1 and improving the disassembly efficiency, and on the other hand, reducing the lateral interference of the pump head 1 on the plunger rod 3 due to shaking during the axial movement, which is beneficial to reducing the risk of damage or deformation of the plunger rod 3, reducing the cost of replacing parts, and reducing the maintenance cost of the pump head 1 and the plunger rod 3.

[0040] Embodiment 2: See attached Figure 7 -Attached Figure 8 On the basis of the first embodiment of the present invention, the pump head 1 includes a first extension portion 6 on the outside, the pump body 2 includes a second extension portion 7 on the outside that matches the first extension portion 6, the first extension portion 6 and the second extension portion 7 have a circular ring body 41, the first extension portion 6 has a first guide surface on the outer edge, the second extension portion 7 has a second guide surface on the outer edge, the first guide surface and the second guide surface are both conical surfaces and approach each other at the outer edges, and the ring body 41 has an inner contour that matches the first guide surface and the second guide surface; The ring body 41 includes two symmetrically arranged arc-shaped plates, the two arc-shaped plates are hinged at one end, and the two protrusions are respectively connected to the hinged ends of the two arc-shaped plates; The protrusion has a U-shaped opening, and the connecting rod 42 has a connecting end and a free end, the connecting end is connected to one of the U-shaped openings of the protrusion, and the free end extends out of the other U-shaped opening; The clamp body 43 is an annular member. The outer wall surface of the connecting rod 42 has an external thread. The inner side of the clamp body 43 has an internal thread that matches the external thread. The clamp body 43 can be sleeved on the connecting rod 42 by the free end.

[0041] During assembly, the two arc plates are opened at the hinge; one of the arc plates is covered on one side outside the first extension part 6 and the second extension part 7 to form an initial positioning; the other arc plate is swung at the hinge to cover the other side outside the first extension part 6 and the second extension part 7 to form a secondary positioning; during the swinging of the arc plate, the connecting rod 42 passes through the U-shaped opening on the protrusion of the swinging arc plate; the clamp body 43 is inserted through the free end of the connecting rod 42, and the clamp body 43 is rotated to approach and squeeze the protrusion close to the free end on the connecting rod 42, so that the distance between the two protrusions is reduced, thereby realizing the connection of the inner contour formed by the two arc plates outside the first extension part 6 and the second extension part 7, thereby realizing the assembly of the pump body 2 and the pump head 1.

[0042] The first guide surface and the second guide surface are close to each other to form conical surfaces on their respective extension parts. When the ring body 41 is in close contact with the first guide surface and the second guide surface through the inner contour, the first extension part 6 and the second extension part 7 can be squeezed toward each other through the conical surface, which is conducive to forming an installation guide. At the same time, the outer contours between the extension parts can be aligned through the guide surface, thereby correcting the alignment of the channels inside the pump head 1 and the pump body 2, thereby ensuring the coaxiality of the first rod body 31 to the second rod body 32 during the threaded connection, reducing the possibility of misalignment during threaded assembly connection, reducing the interference between the first rod body 31 and the second rod body 32 at the threaded connection during assembly, and also improving assembly efficiency.

[0043] The alignment of the channels corrects the coaxiality of the first rod body 31 relative to the second rod body 32 , which is beneficial to improving the stability of the second rod body 32 transmitting the axial motion to the first rod body 31 , thereby ensuring the stability of the first rod body 31 in conveying materials.

[0044] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An axially limited pump head assembly for tightening a split plunger rod, comprising: A pump head (1) and a pump body (2) are detachably connected, wherein a plunger rod (3) is provided in cooperation with the pump head (1) and the pump body (2), and wherein a connecting piece (4) is provided at the periphery of the matching portion of the pump head (1) and the pump body (2), and the connecting piece (4) comprises a ring body (41) in contact with the outer surfaces of the pump head (1) and the pump body (2).

2. The axially limited pump head assembly for tightening the split plunger rod according to claim 1 is characterized in that: The ring body (41) has an opening, and the connecting member (4) further comprises a fastener connected at the opening, wherein the fastener is used to adjust the size of the opening.

3. The axially limited pump head assembly for tightening the split plunger rod according to claim 2 is characterized in that: The ring body (41) has protrusions located on both sides of the opening, and the fastener comprises a connecting rod (42) and a clamping body (43), wherein the connecting rod (42) cooperates with the two protrusions and connects the clamping body (43), and the clamping body (43) is capable of adjusting the spacing between the protrusions.

4. The axial limit pump head assembly for tightening the split plunger rod according to claim 1 is characterized in that The plunger rod (3) comprises a first rod body (31) and a second rod body (32) which are coaxially arranged, the first rod body (31) and the second rod body (32) being detachably connected in the axial direction, and an elastic member (5) is provided at the connection between the first rod body (31) and the second rod body (32).

5. The axially limited pump head assembly for tightening the split plunger rod according to claim 4 is characterized in that: The first rod body (31) comprises an inserting section (311), one end of the second rod body (32) comprises a groove body (321), the groove body (321) has a groove bottom, the inserting section (311) comprises a head threadedly engaged with the groove body (321), a chamber is present between the head and the groove bottom, and the elastic member (5) can be squeezed by the head and the groove bottom in the chamber.

6. The axially limited pump head assembly for tightening the split plunger rod according to claim 5 is characterized by: The outer wall surface of the head has a step that converges inwards, and the elastic member (5) cooperates with the step. The elastic member (5) can deform in the direction in which the head enters the groove body (321).

7. The axially limited pump head assembly for tightening the split plunger rod according to claim 5 is characterized by: The first rod body (31) further comprises a conveying section (312), one end of the conveying section (312) being connected to an end of the plug-in section (311) away from the second rod body (32).

8. The axially limited pump head assembly for tightening the split plunger rod according to claim 5 is characterized by: A groove is provided on the outer wall of one end of the plug-in section (311) away from the second rod body (32), and the grooves are evenly distributed on the outer wall surface of the plug-in section (311).

9. The axially limited pump head assembly for tightening the split plunger rod according to claim 7 is characterized by: The plug-in section (311) further comprises a socket, one end of the socket is connected to the conveying section (312), and the other end of the socket is connected to the head.

10. The axially limited pump head assembly for tightening the split plunger rod according to claim 4, characterized in that: The pump head (1) and the pump body (2) have a channel, the first rod body (31) fits in the channel and can rotate axially, the first rod body (31) can be relatively separated from the second rod body (32) along the axis, and at least one of the pump head (1) and the pump body (2) is provided with an operating hole on the outer wall surface, the operating hole being connected to the channel.

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