Connecting device capable of conveniently and quickly replacing piston rod

Abstract

The utility model discloses a connecting device capable of conveniently and quickly replacing a piston rod, which comprises a shell, a telescopic piece is sleeved in the shell and comprises a telescopic body, and a first connecting end and a second connecting end are arranged at two ends of the telescopic body in the telescopic direction of the telescopic body. The first connecting end and the second connecting end are used for being connected with a piston rod and an intermediate rod respectively, arranged in the shell and attached to the inner wall face of the shell in a sealed mode so that a hydraulic cavity can be formed in the position, between the first connecting end and the second connecting end, in the shell. The axial position of the first connecting end and the axial position of the second connecting end can be driven by pressure in the hydraulic cavity. The device is reasonable in structure, convenient to disassemble and assemble and high in disassembly and assembly efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment, in particular to a connecting device which can conveniently and quickly replace a piston rod. Background Art

[0002] Large reciprocating equipment, such as a high-pressure mud pump used in oil production, includes a power end and a hydraulic end. The components forming the power end include multiple crossheads and intermediate rods, and the components forming the hydraulic end include multiple pistons and cylinder sleeves that cooperate with the pistons, wherein the crosshead and the intermediate rod are fixedly connected, and the intermediate rod is connected to the piston rod through a connecting rod. In this way, the power end drives the piston to reciprocate in the cylinder sleeve through the crosshead and the intermediate rod to perform work.

[0003] Among them, the pressurized drilling fluid transported by the mud pump usually contains a large amount of solid matter and is highly abrasive. In the drilling fluid environment of high pressure and abrasive cavity, the components of the hydraulic end of the mud pump are often severely worn, such as the piston, cylinder liner, etc., so these components need to be replaced frequently and regularly. When replacing these components, the mud pump must stop working, resulting in drilling interruption.

[0004] In the existing design, the piston rod is usually fixedly connected by a connecting rod and an intermediate rod, and the two ends of the connecting rod are respectively fixedly connected to the piston rod and the intermediate rod by clamps and bolt assemblies. During disassembly and assembly, workers are required to carry tools such as wrenches to enter the pump casing to operate. The space of the pump casing is small, and the workers' operation is time-consuming, labor-intensive and inefficient. Utility Model Content

[0005] The utility model discloses a connection device that can conveniently and quickly replace the piston rod, which solves the technical problems of the prior art that the disassembly and assembly of the intermediate rod and the piston rod connection mechanism is time-consuming and labor-intensive, and inefficient, and has the technical effects of reasonable structure, convenient disassembly and assembly, and high disassembly and assembly efficiency. The technical solution adopted is as follows:

[0006] A connecting device for convenient and quick replacement of a piston rod comprises a shell, a telescopic part is sleeved in the shell, the telescopic part comprises a telescopic body, the telescopic body is provided with a first connecting end and a second connecting end at both ends of its telescopic direction, the first connecting end and the second connecting end are respectively used to connect the piston rod and the intermediate rod, the first connecting end and the second connecting end are arranged in the shell and sealed with the inner wall surface of the shell to form a hydraulic cavity in the shell between the first connecting end and the second connecting end, and the axial position of the first connecting end and the second connecting end can be driven by the pressure in the hydraulic cavity.

[0007] On the basis of the above technical solution, the telescopic body comprises a tubular body, and a spiral long groove is provided on the side wall of the tubular body.

[0008] Based on the above technical solution, there are at least two spiral long grooves and they are evenly arranged in the circumferential direction.

[0009] On the basis of the above technical solution, the hydraulic chamber is connected to the hydraulic station through a hydraulic joint, and a hydraulic pump is provided on the pipeline connecting the hydraulic joint and the hydraulic station.

[0010] Based on the above technical solution, the first connection end includes a first spherical sleeve and a first rotary connector, the first spherical sleeve is fixedly arranged and includes a first spherical inner wall surface, the first rotary connector is T-shaped and its head is sleeved in the first spherical sleeve, and the head of the first rotary connector includes a first spherical outer wall surface that fits the first inner wall surface, the tail of the first rotary connector extends out of the first spherical sleeve and is provided with a first pin hole, when the tail of the first rotary connector extends into the piston rod, a pin can pass through the piston rod and the first pin hole to connect the piston rod and the connecting device.

[0011] On the basis of the above technical solution, the end surface of the housing or the first spherical sleeve facing the piston rod includes a first spherical surface, and the end surface of the piston rod facing the first spherical surface includes a second spherical surface matched with the first spherical surface.

[0012] Based on the above technical solution, the part of the first rotary connector extending out of the first spherical sleeve includes a spherical length section, and the center of the spherical length section passes through the axis of the first pin hole, and a first O-ring is sleeved on one side of the spherical length section close to the first spherical sleeve.

[0013] On the basis of the above technical solution, the second connecting end includes a second spherical sleeve and a second rotating connector, the second spherical sleeve is fixedly arranged and includes a second spherical inner wall surface, the second rotating connector is T-shaped and its head is sleeved in the second spherical sleeve, the head of the second rotating connector includes a second spherical outer wall surface that fits the second inner wall surface, the tail of the second rotating connector extends out of the second spherical sleeve and is provided with a second pin hole, when the tail of the second rotating connector extends into the intermediate rod, a pin can pass through the intermediate rod and the second pin hole to connect the intermediate rod and the connecting device, and the axes of the first pin hole and the second pin hole are not coplanar, preferably, the axes of the first pin hole and the second pin hole are perpendicular.

[0014] On the basis of the above technical solution, the end surface of the shell or the second spherical sleeve facing the intermediate rod includes a third spherical surface, and the end surface of the intermediate rod facing the third spherical surface includes a fourth spherical surface adapted to the third spherical surface.

[0015] Based on the above technical solution, the two ends of the shell include an annular structure wrapped around the intermediate rod or the piston rod. When the piston rod is plugged into the first rotary connector and the intermediate rod is plugged into the second rotary connector, the annular structure can guide the piston rod or the intermediate rod.

[0016] Beneficial Effects

[0017] The utility model has a reasonable structure, the telescopic member can be axially telescopic under the action of hydraulic pressure, and the two ends of the telescopic member are plugged with the intermediate rod and the piston rod through the first connecting end and the second connecting end, which is not only conducive to reducing the requirements for processing accuracy, simplifying the process and reducing processing costs, but also convenient for disassembly and assembly, saving time and effort. By controlling the axial telescopic extension of the telescopic member, the disassembly and assembly operation can be completed quickly, greatly reducing downtime, and helping to improve the working efficiency of the mud pump. In addition, when the hydraulic cavity is depressurized, the pins in the first and second pin holes can also be pre-locked to avoid loosening during use.

[0018] In addition, the connecting device in the utility model has a large tolerance for the position error of the intermediate rod or the piston rod, wherein the first spherical sleeve and the first rotary connector are spherically connected, so that the first rotary connector can rotate universally to quickly complete the assembly when there is a large position error of the piston rod. In addition, the two end surfaces opposite to the shell or the first spherical sleeve and the piston rod include spherical surfaces that can interfere with each other, so that the piston rod can move universally relative to the connecting device, which is beneficial to further improve the tolerance for the position error of the piston rod, and is beneficial to quickly complete the assembly operation and improve the efficiency of disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only one embodiment of the utility model. For ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] Figure 1 : A schematic diagram of a structure in which an intermediate rod and a piston rod are connected by a connecting rod and a clamp in the prior art;

[0021] Figure 2 : A schematic diagram of the three-dimensional structure of the utility model;

[0022] Figure 3 : A schematic diagram of the cross-sectional structure of the main view of the utility model;

[0023] Figure 4 : A schematic diagram of the structure of the hydraulic chamber when pressurized in the utility model;

[0024] Figure 5 : A schematic diagram of the structure of the hydraulic chamber after pressure relief in the utility model; DETAILED DESCRIPTION

[0025] The following description and accompanying drawings fully illustrate the specific embodiments of this article so that those skilled in the art can practice them. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of this article includes the entire scope of the claims, as well as all available equivalents of the claims. Herein, the terms "first", "second", etc. are only used to distinguish one element from another, without requiring or implying any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the structure, device or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such structure, device or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the structure, device or equipment including the elements. Each embodiment is described in a progressive manner herein, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0026] The terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used herein to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this article and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In the description of this article, unless otherwise specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, it can also be the internal connection of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0027] As used herein, the term "plurality" means two or more than two, unless otherwise specified.

[0028] In this document, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0029] In this article, the term "and / or" is a description of the association relationship between objects, indicating that three relationships may exist. For example, A and / or B means: A or B, or, A and B.

[0030] like Figures 1 to 5A connecting device for conveniently and quickly replacing a piston rod as shown in FIG. 1 includes a housing 1, as shown in FIG. Figure 3 As shown, the shell 1 includes a through hollow cavity, in which a telescopic member 2 is sleeved, and the telescopic member includes a telescopic body 21. In this embodiment, the telescopic body 21 includes a tubular body 211, and a spirally extending long groove 212 is provided on the side wall of the tubular body 211, wherein there are two spiral long grooves 212 and they are evenly arranged in the circumferential direction, so that the telescopic body 21 has a certain degree of extension performance in its axial direction.

[0031] like Figure 3 As shown, both ends of the inner cavity of the telescopic body 21 are sealed by screw plugs, and the tubular body 211 is provided with a first connecting end 22 and a second connecting end 23 at both ends of its telescopic direction, wherein the first connecting end 22 and the second connecting end 23 are arranged in the shell 1 and are sealed and fitted with the inner wall surface of the shell 1, so that a hydraulic cavity is formed in the shell 1 between the first connecting end 22 and the second connecting end 23, and then the axial position of the first connecting end 22 and the second connecting end 23 can be driven by the pressure in the hydraulic cavity.

[0032] like Figure 4 and 5 As shown, the first connecting end 22 is used to connect the piston rod 100, and the first connecting end 22 includes a first mounting seat 220, a first spherical sleeve 221 and a first rotary connector 223, wherein the first mounting seat 220 is integrally formed with the tubular body 211, and the first mounting seat 220 is adapted and transitionally matched with the inner wall surface of the shell 1 at the corresponding position, and a sealing member, such as an O-ring, is sleeved at the transitional fit between the outer wall surface of the first mounting seat 220 and the inner wall surface of the shell 1, so that the first mounting seat 220 can seal the hydraulic chamber.

[0033] like Figure 3 As shown, the outer end surface of the first mounting seat 220 is provided with a first groove, and the first spherical sleeve 221 partially extends into the first groove and is threadedly connected to the first groove, so that the first spherical sleeve 221 is fixedly arranged. The first spherical sleeve 221 is a hollow component and includes a first inner wall surface that is spherical.

[0034] The first rotary connector 222 is T-shaped and its head is sleeved in the first spherical sleeve 221. The head of the first rotary connector 222 includes a first spherical outer wall surface that fits the first inner wall surface, so that the first rotary connector 222 and the first spherical sleeve 221 can be universally rotatably connected. In addition, a first annular baffle 5 is embedded on the inner wall surface of the shell near the outer end surface of the first mounting seat 220 to limit the axial displacement of the tubular body 211, and the structure is more stable.

[0035] like Figure 3As shown, the tail of the first rotary connector 222 extends out of the first spherical sleeve 221 and is provided with a first pin hole 223. The end surface of the piston rod 100 facing the first rotary connector 222 is provided with a first countersunk hole for accommodating the tail of the first rotary connector 222. When the tail of the first rotary connector 222 extends into the first countersunk hole on the piston rod 100, a pin can pass through the piston rod 100 and the first pin hole 223 to connect the piston rod 100 and the connecting device. In this embodiment, the pin, the piston rod 100 and the first pin hole 223 are all clearance-matched, which can facilitate manual operation and quickly and accurately connect the piston rod 100 and the connecting device.

[0036] In this embodiment, the outer end surface of the first spherical sleeve 221 is slightly lower than the end surface of the shell 1 at the corresponding position, and the end surface of the shell 1 facing the piston rod 100 includes a first spherical surface 224, and the end surface of the piston rod 100 facing the first spherical surface 224 includes a second spherical surface 225 that is adapted to the first spherical surface 224. In this way, when the piston rod 100 abuts against the first spherical surface 224, it can be universally rotatably connected, has a large tolerance for the position error of the piston rod 100, and is convenient for quick assembly.

[0037] In addition, the portion of the first rotary connector 222 extending out of the first spherical sleeve 221 includes a spherical length section, and the center of the spherical length section passes through the axis of the first pin hole 223. A first O-ring is sleeved on one side of the spherical length section close to the first spherical sleeve 221, so that the piston rod 100 can be tightly connected to the first rotary connector 222. At the same time, when the piston rod 100 is passively universally rotated, the gap between the first countersunk hole and the first rotary connector 222 forms a buffer zone to avoid hard collision.

[0038] like Figure 3 As shown, the second connecting end 23 is used to connect the intermediate rod 200, and the second connecting end 23 includes a second mounting seat 230, a second spherical sleeve 231 and a second rotary connector 232, wherein the second mounting seat 230 is integrally formed with the tubular body 211, and the second mounting seat 230 is adapted and transitionally matched with the inner wall surface of the shell 1 at the corresponding position, and a second sealing member, such as an O-ring, is sleeved at the transitional fit between the outer wall surface of the second mounting seat 230 and the inner wall surface of the shell 1, so that the hydraulic cavity can be sealed at the other end.

[0039] like Figure 3 As shown, the outer end surface of the second mounting seat 230 is provided with a second groove, and the second spherical sleeve 231 partially extends into the second groove and is threadedly connected to the second groove, so that the second spherical sleeve 231 is fixedly arranged. The second spherical sleeve 231 is a hollow component and includes a second inner wall surface that is spherical.

[0040] The second rotary connector 232 is T-shaped and its head is sleeved in the second spherical sleeve 231. The head of the second rotary connector 232 includes a spherical second outer wall surface that fits the second inner wall surface, so that the second rotary connector 232 and the second spherical sleeve 231 can be universally rotatably connected. In addition, a second annular baffle 6 is embedded on the inner wall surface of the housing 1 near the outer end surface of the second mounting seat 230, which can limit the axial displacement of the tubular body 211 and make the structure more stable.

[0041] like Figure 3 As shown, the tail of the second rotary connector 232 extends out of the second spherical sleeve 231 and is provided with a second pin hole 233. The end surface of the intermediate rod 200 facing the second rotary connector 232 is provided with a second countersunk hole for accommodating the tail of the second rotary connector 232. When the tail of the second rotary connector 232 extends into the second countersunk hole on the intermediate rod 200, a pin can pass through the intermediate rod 200 and the second pin hole 233 to connect the intermediate rod 200 and the connecting device. In this embodiment, the pin is clearance-matched with the intermediate rod 200 and the second pin hole 233, which can facilitate manual operation and quickly and accurately connect the intermediate rod 200 and the connecting device.

[0042] In this embodiment, the outer end surface of the second spherical sleeve 231 is slightly lower than the end surface of the housing 1 at the corresponding position, and the end surface of the housing facing the intermediate rod 200 includes a spherical third spherical surface 234, and the end surface of the intermediate rod 200 facing the third spherical surface 234 includes a fourth spherical surface 235 adapted to the third spherical surface 234, so that when the intermediate rod 200 and the third spherical surface 234 collide, they can be universally rotated and connected, with a large tolerance for the position error of the intermediate rod 200, and the assembly operation can be completed conveniently and quickly. In addition, the second rotating connector 232 between the pin and the end surface of the second spherical sleeve 231 is provided with a second O-ring.

[0043] like Figure 3 As shown, the axes of the first pin hole 223 and the second pin hole 233 are perpendicular, so that the coaxiality of the intermediate rod 200, the connecting device and the piston rod 100 can be corrected on multiple planes, which is beneficial to ensure the stability of equipment operation.

[0044] In addition, both ends of the shell 1 include an annular structure 4 wrapped around the intermediate rod 200 or the piston rod 100. When the piston rod 100 is plugged into the first rotary connector 222 and the intermediate rod 200 is plugged into the second rotary connector 232, the annular structure 4 can guide the piston rod 100 or the intermediate rod 200 for easy operation.

[0045] The inner cavity of the housing 1 between the first connector 22 and the second connector 23 forms a closed hydraulic cavity, which is connected to the hydraulic station through the hydraulic connector 3, and a hydraulic pump is provided on the pipeline connecting the hydraulic connector 3 and the hydraulic station;

[0046] In this example, Figure 4 As shown, when the piston rod 100 and the intermediate rod 200 are disassembled, the telescopic body 21 can be driven to stretch by pressurizing the hydraulic chamber, so that the second mounting seat 230 is displaced axially outward, the first mounting seat 220 is displaced axially outward, and the first rotary connector 222 and the second rotary connector 232 are pushed outward, so that the pin holes on the first rotary connector 222 and the second rotary connector 232 can be close to the axes of the pin holes on the piston rod 100 and the intermediate rod 200, so that the pins can pass through or out of the pin holes conveniently. At the same time, the spherical surfaces of the piston rod 100 and the intermediate rod 200 respectively disappear in pressure contact with the spherical surface of the shell 1, and a movable gap appears, so that it is easier to disassemble the piston rod 100 and the intermediate rod 200, and then replace the piston rod 100 and the piston.

[0047] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments, and any changes or modifications based on the present invention belong to the scope of protection required by the present invention.

Claims

1. A connection device that can easily and quickly replace the piston rod, It is characterized in that The invention comprises a shell (1), wherein a telescopic member (2) is sleeved in the shell (1), wherein the telescopic member (2) comprises a telescopic body (21), wherein the telescopic body (21) is provided with a first connecting end (22) and a second connecting end (23) at both ends of the telescopic body (21) in the telescopic direction, wherein the first connecting end (22) and the second connecting end (23) are respectively used to connect a piston rod (100) and an intermediate rod (200), wherein the first connecting end (22) and the second connecting end (23) are arranged in the shell (1) and are sealed to the inner wall surface of the shell (1) so as to form a hydraulic cavity in the shell (1) between the first connecting end (22) and the second connecting end (23), wherein the axial positions of the first connecting end (22) and the second connecting end (23) can be driven by the pressure in the hydraulic cavity.

2. The connecting device for convenient and quick replacement of the piston rod according to claim 1, It is characterized in that The telescopic body (21) comprises a tubular body (211), and a spiral long groove (212) is provided on the side wall of the tubular body (211).

3. The connecting device for convenient and quick replacement of the piston rod according to claim 2, It is characterized in that The number of the spiral long grooves (212) is at least two and they are evenly arranged in the circumferential direction.

4. The connecting device for convenient and quick replacement of the piston rod according to any one of claims 1 to 3, It is characterized in that The hydraulic chamber is in communication with the hydraulic station via a hydraulic joint (3); a hydraulic pump is provided on a pipeline connecting the hydraulic joint (3) and the hydraulic station.

5. The connecting device for convenient and quick replacement of the piston rod according to claim 4, It is characterized in that The first connection end (22) comprises a first spherical sleeve (221) and a first rotary connector (222); the first spherical sleeve (221) is fixedly arranged and comprises a first inner wall surface in the form of a spherical surface; the first rotary connector (222) is T-shaped and its head is sleeved in the first spherical sleeve; the head of the first rotary connector (222) comprises a first outer wall surface in the form of a spherical surface that fits the first inner wall surface; the tail of the first rotary connector (222) extends out of the first spherical sleeve (221) and is provided with a first pin hole (223); when the tail of the first rotary connector (222) extends into the piston rod (100), a pin can pass through the piston rod (100) and the first pin hole (223) to connect the piston rod (100) and the connecting device.

6. The connecting device for convenient and quick replacement of the piston rod according to claim 5, It is characterized in that The end surface of the housing (1) or the first spherical sleeve (221) facing the piston rod (100) comprises a first spherical surface (224), and the end surface of the piston rod (100) facing the first spherical surface (224) comprises a second spherical surface (225) adapted to the first spherical surface (224).

7. The connecting device for convenient and quick replacement of the piston rod according to claim 6, It is characterized in that The portion of the first rotary connector (222) extending outside the first spherical sleeve (221) comprises a spherical length section, the center of which passes through the axis of the first pin hole (223), and a first O-ring is sleeved on one side of the spherical length section close to the first spherical sleeve (221).

8. The connecting device for convenient and quick replacement of the piston rod according to any one of claims 5 to 7, It is characterized in that The second connection end (23) includes a second spherical sleeve (231) and a second rotary connector (232). The second spherical sleeve (231) is fixedly arranged and includes a second inner wall surface in the form of a spherical surface. The second rotary connector (232) is T-shaped and its head is sleeved in the second spherical sleeve (231). The head of the second rotary connector (232) includes a second outer wall surface in the form of a spherical surface that fits the second inner wall surface. The tail of the second rotary connector (232) extends out of the second spherical sleeve (231) and is provided with a second pin hole (233). When the tail of the second rotary connector (232) extends into the intermediate rod (200), a pin can pass through the intermediate rod (200) and the second pin hole (233) to connect the intermediate rod (200) and the connecting device. The axes of the first pin hole (223) and the second pin hole (233) are not coplanar.

9. The connecting device for convenient and quick replacement of the piston rod according to claim 8, It is characterized in that The end surface of the housing (1) or the second spherical sleeve (231) facing the intermediate rod (200) includes a third spherical surface (234), and the end surface of the intermediate rod (200) facing the third spherical surface (234) includes a fourth spherical surface (235) adapted to the third spherical surface (234).

10. The connecting device for convenient and quick replacement of the piston rod according to claim 9, It is characterized in that Both ends of the housing (1) include an annular structure (4) wrapped around the intermediate rod (200) or the piston rod (100); when the piston rod (100) is plugged into the first rotary connector (222) or the intermediate rod (200) is plugged into the second rotary connector (232), the annular structure (4) can guide the piston rod (100) or the intermediate rod (200).

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