CN111453638B - Deep hole piston rod of side-pushing jack and processing method and application thereof - Google Patents
Deep hole piston rod of side-pushing jack and processing method and application thereof Download PDFInfo
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- CN111453638B CN111453638B CN202010222019.6A CN202010222019A CN111453638B CN 111453638 B CN111453638 B CN 111453638B CN 202010222019 A CN202010222019 A CN 202010222019A CN 111453638 B CN111453638 B CN 111453638B
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- hole
- deep hole
- rod body
- piston rod
- sleeve
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
- B66F3/25—Constructional features
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F2700/00—Lifting apparatus
- B66F2700/05—Hydraulic jacks
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Actuator (AREA)
Abstract
The invention discloses a deep hole piston rod of a side-pushing jack and a processing method and application thereof, wherein the size of raw materials for preparing the deep hole piston rod can be reduced by changing the whole deep hole piston rod into a structure with a split rod body and a fixed sleeve, so that the processing cost is reduced, and the problem that the deep hole is not completely sealed in a sealing surface first-thread and then-seal mode between the rod body and the fixed sleeve commonly used in the prior art is avoided by communicating the deep hole with a sealing hole and a threaded hole in sequence. In a word, through changing the deep hole piston rod from whole body into body of rod and the split type structure of fixed cover, it is more convenient to process compared with the piston rod that has the welding mount pad structure, and cooperation dimensional accuracy is higher.
Description
Technical Field
The invention belongs to the field of fully-mechanized coal mining equipment, and particularly relates to a deep hole piston rod of a side-pushing jack, and a processing method and application thereof.
Background
The hydraulic support side pushing jack for the coal mine is arranged in the side pushing sleeve, wherein one side of the side pushing jack is fixed by a lock pin, and the other side of the side pushing jack moves in the side pushing sleeve. The side pushing jack drives the side guard plate to extend and retract along the axial direction when in operation. Because the side-pushing jack adopts a piston rod to drill deep holes, namely an inner liquid inlet structure mode, no matter the end part of the piston rod is provided with a threaded liquid inlet hole or a welded joint mounting block, the diameter of the end part of the piston rod is far greater than that of the piston rod main body, and further the piston rod is intangibly improved in raw material selection and machining. And the deep hole piston rod of the side pushing jack in the prior art adopts a structure that the rod head of the piston rod is welded on a mounting seat, and has the following defects: (1) The mount pad welds in pole head department, consequently, the diameter of pole head department needs to increase, just can satisfy the size of mount pad, and then the cost of raw and other materials can increase. (2) When the mounting seat is welded with the club head, the welding strength, namely the size of a welding line, is required to be met, and heat generated by welding is easy to deform a sealing hole under the mounting seat; (3) The mounting seat and the sealing hole communicated with the deep hole have the position requirements of verticality and coaxiality, so that the positioning of the mounting seat before welding is required to be strict. (4) If factors such as position degree, post-welding deformation and the like are considered, the secondary processing of the sealing hole can increase the manufacturing cost and prolong the manufacturing period. (5) In order to facilitate the disassembly and assembly of the rubber tube joint during the assembly of the hydraulic system, the mounting seat is led to the outside of the box body as far as possible.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a processing method and application of a deep hole piston rod of a side-pushing jack, and the technical problems of the prior art, which are caused by the need of welding a piston rod with an installation seat, are avoided by changing the whole deep hole piston rod into a structure with a split rod body and a fixed sleeve.
The invention provides a deep hole piston rod of a side-pushing jack, which comprises a rod body and a fixed sleeve, wherein a deep hole and a sealing hole communicated with the deep hole are formed in the rod body; one end of the rod body is inserted into the fixing sleeve and is fixed with the fixing sleeve, a threaded hole is formed in the fixing position of the fixing sleeve and the rod body, and the threaded hole penetrates through the side wall of the fixing sleeve and is communicated with the sealing hole.
Further, the axis of the sealing hole is perpendicular to the axis of the deep hole, the axis of the sealing hole and the axis of the threaded hole are on the same straight line, and the aperture of the threaded hole is larger than that of the sealing hole.
Further, the rod body comprises an insertion part arranged on one side of the rod body, the insertion part is inserted into one side of the fixing sleeve and is fixed with the fixing sleeve, the length of the insertion part is smaller than that of the fixing sleeve, and the outer diameter of the insertion part is smaller than the inner diameter of the fixing sleeve.
Further, two ends of the insertion part are fixedly connected with the fixing sleeve through welding respectively.
Further, the diameter of the rod body is smaller than the diameter of the insertion portion.
According to the deep hole piston rod of the side-pushing jack, provided by the invention, the size of raw materials for preparing the deep hole piston rod can be reduced by changing the whole deep hole piston rod into a structure with the split type rod body and the fixed sleeve, so that the processing cost is reduced, and the problem that the sealing surface between the rod body and the fixed sleeve cannot be completely sealed in a mode of firstly screwing and then sealing is commonly used in the prior art is avoided by communicating the deep hole with the sealing hole and the threaded hole in sequence, and the threaded hole penetrates through the side wall of the fixed sleeve, so that the rubber pipe joint can be conveniently connected, and the rubber pipe joint can be conveniently assembled and disassembled with a U-shaped clamp. In a word, through changing the deep hole piston rod from whole body into body of rod and the split type structure of fixed cover, it is more convenient to process compared with the piston rod that has the welding mount pad structure, and cooperation dimensional accuracy is higher.
The second aspect of the invention provides a method for processing a deep hole piston rod of a side-pushing jack, which comprises the following steps:
processing two parallel deep holes in the rod body;
inserting one end of the rod body into the fixing sleeve and fixing the rod body with the fixing sleeve;
the fixed position of the fixed sleeve and the rod body is sequentially provided with a sealing hole communicated with the deep hole and a threaded hole penetrating through the side wall of the fixed sleeve and communicated with the sealing hole, so that the processing of the deep hole piston rod is completed.
Further, when the fixed position of the fixed sleeve and the rod body is sequentially provided with a sealing hole and a threaded hole, the method comprises the following steps:
a through hole which penetrates through the side wall of the fixed sleeve and is communicated with the deep hole is formed in the fixed position of the fixed sleeve and the rod body;
reaming one end of the through hole far away from the deep hole to form a threaded hole on the side wall of the fixed sleeve and the outer wall of the rod body close to the fixed sleeve, wherein the position of the through hole which is not reamed is a sealing hole;
wherein the axis of the through hole is perpendicular to the axis of the deep hole.
Further, the method further comprises the following steps: an insertion part is machined at one end of the rod body, the length of the insertion part is smaller than that of the fixing sleeve, and the outer diameter of the insertion part is smaller than the inner diameter of the fixing sleeve and larger than the outer diameter of the rest position of the rod body.
Further, when one end of the rod body is inserted into the fixing sleeve and fixed with the fixing sleeve, the method comprises the following steps:
inserting the insertion portion of the rod body into the fixing sleeve;
the insertion part extends into one end of the fixed sleeve and is fixedly connected with the fixed sleeve through welding;
and fixedly connecting one end of the insertion part, which is close to the outer side of the fixed sleeve, with the fixed sleeve through welding.
According to the processing method of the deep hole piston rod of the side-pushing jack, one end of the rod body is inserted into the fixed sleeve and is fixed with the fixed sleeve, and the fixed position of the fixed sleeve and the rod body is sequentially provided with the sealing hole and the threaded hole, so that the position requirements of verticality and coaxiality between the mounting seat and the sealing hole communicated with the deep hole in the prior art are avoided, and the deformation of the sealing hole under the mounting seat is easily caused by heat generated when the mounting seat and the rod head are welded, further secondary processing of the sealing hole is avoided, the manufacturing cost is reduced, and the manufacturing period is shortened.
The third aspect of the invention provides a hydraulic support side-pushing jack, which comprises a deep hole piston rod of the side-pushing jack and a deep hole piston rod processed by the processing method of the deep hole piston rod of the side-pushing jack.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
fig. 1 is a schematic structural view of a deep hole piston rod of a side-pushing jack of the prior art;
fig. 2 is a schematic structural view of a deep hole piston rod of a side-pushing jack according to an exemplary embodiment of the present invention;
fig. 3 is a cross-sectional view of a deep hole piston rod of a side-pushing jack according to an exemplary embodiment of the present invention;
fig. 4 is a flowchart of a method for processing a deep hole piston rod of a side-pushing jack according to an exemplary embodiment of the present invention;
FIG. 5 is a process flow diagram of sequentially forming a seal hole and a threaded hole at a fixed position of a fixed sleeve and a rod body according to an exemplary embodiment of the present invention;
fig. 6 is a process flow diagram of an end of a rod body inserted into and fixed with a fixing sleeve according to an exemplary embodiment of the present invention.
In the figure:
the device comprises a piston rod body A, a deep hole A1, a mounting seat B, a C-joint block and a C1-sealing hole;
1-a rod body, 101-a deep hole, 102-a sealing hole and 103-an inserting part;
2-fixing the sleeve;
3-threaded holes.
Detailed Description
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
The deep hole piston rod of the side pushing jack in the prior art comprises a piston rod body A, two deep holes A1 arranged in the piston rod body A and two joint blocks C, wherein one side of the piston rod body A is provided with a mounting seat B, the joint blocks C are respectively welded on the mounting seat B corresponding to the two deep holes A1, and sealing holes C1 communicated with the deep holes A1 are respectively formed in the joint blocks C. Therefore, the deep hole piston rod of the side pushing jack in the prior art has the following defects that the rod head of the piston rod is welded on a mounting seat: (1) The mount pad welds in pole head department, consequently, the diameter of pole head department needs to increase, just can satisfy the size of mount pad, and then the cost of raw and other materials can increase. (2) When the mounting seat is welded with the club head, the welding strength, namely the size of a welding line, is required to be met, and heat generated by welding is easy to deform a sealing hole under the mounting seat; (3) The mounting seat and the sealing hole communicated with the deep hole have the position requirements of verticality and coaxiality, so that the positioning of the mounting seat before welding is required to be strict. (4) If factors such as position degree, post-welding deformation and the like are considered, the secondary processing of the sealing hole can increase the manufacturing cost and prolong the manufacturing period. (5) In order to facilitate the disassembly and assembly of the rubber tube joint during the assembly of the hydraulic system, the mounting seat is led to the outside of the box body as far as possible.
Therefore, in order to solve the problem in the prior art that the rod head of a piston rod in a deep hole piston rod of a side-pushing jack is poor in welding and installing seat effect, the invention provides the deep hole piston rod of the side-pushing jack, and a processing method and application thereof.
The invention provides a deep hole piston rod of a side-pushing jack, which is shown in figures 2 and 3, and comprises a rod body 1 and a fixed sleeve 2, wherein a deep hole 101 and a sealing hole 102 communicated with the deep hole 101 are arranged in the rod body 1; one end of the rod body 1 is inserted into the fixed sleeve 2 and fixed with the fixed sleeve 2, a threaded hole 3 is formed in the fixed position of the fixed sleeve 2 and the rod body 1, and the threaded hole 3 penetrates through the side wall of the fixed sleeve 2 and is communicated with the sealing hole 102. Wherein, the fixed sleeve 2 is connected with the mounting seat on the side pushing jack through bolts.
According to the invention, the deep hole piston rod is changed from a whole body into a structure with the rod body 1 and the fixed sleeve 2 being separated, so that the size of raw materials for preparing the deep hole piston rod can be reduced, and the processing cost is further reduced. The deep hole 101 is communicated with the sealing hole 102 and the threaded hole 3 in sequence, so that the problem that the sealing surface between the rod body 1 and the fixed sleeve 2 is in a mode of being threaded firstly and sealed afterwards, which is commonly used in the prior art, cannot be completely sealed is avoided, and the threaded hole 3 penetrates through the side wall of the fixed sleeve 2, so that the hose connector can be conveniently connected, and the U-shaped clamp can be disassembled and assembled more conveniently. In a word, through changing the deep hole piston rod from whole into body of rod 1 and the split type structure of fixed cover 2, it is more convenient to process compared with the piston rod that has the welding mount pad structure, and cooperation dimensional accuracy is higher.
As a preferred embodiment, the axis of the seal hole 102 is perpendicular to the axis of the deep hole 101, the axis of the seal hole 102 and the axis of the threaded hole 3 are on the same line, and the aperture of the threaded hole 3 is larger than the aperture of the seal hole 102. In this embodiment, the axis of the seal hole 102 and the axis of the threaded hole 3 are on the same straight line, and the aperture of the threaded hole 3 is larger than that of the seal hole 102, so that the connection rubber hose connector is convenient to connect with the threaded hole 3, and the seal hole 102 is convenient to seal.
As a preferred embodiment, the rod body 1 includes an insertion portion 103 provided at one side of the rod body 1, the insertion portion 103 being inserted into one side of the fixing sleeve 2 and fixed with the fixing sleeve 2, wherein the length of the insertion portion 103 is smaller than the length of the fixing sleeve 2, and the outer diameter of the insertion portion 103 is smaller than the inner diameter of the fixing sleeve 2.
As a preferred embodiment, both ends of the insertion portion 103 are fixedly connected to the fixing sleeve 2 by welding, respectively. In the present embodiment, only by welding the two ends of the insertion portion 103 with the fixing sleeve 2, the insertion portion 103 is fixed to the fixing sleeve 2, and the problem that complicated operations are required such as interference fit connection and bolting is avoided.
As a preferred embodiment, the diameter of the rod body 1 is smaller than the diameter of the insertion portion 103. In this embodiment, the diameter of the rod body 1 is smaller than the diameter of the insertion portion 103, so that the outer diameter of the rod body 1 except for the insertion portion 103 is smaller than the inner diameter of the fixing sleeve 2, and therefore, compared with the outer diameter of the rod body of the deep hole piston rod in the prior art, the rod body 1 provided in this embodiment reduces the material cost in manufacturing.
The second aspect of the present invention provides a method for machining a deep hole piston rod of a side-pushing jack, referring to fig. 4, including:
s100, processing two parallel deep holes in a rod body;
s200, inserting one end of the rod body into the fixing sleeve and fixing the rod body with the fixing sleeve;
s300, sequentially forming a sealing hole communicated with the deep hole and a threaded hole penetrating through the side wall of the fixed sleeve and communicated with the sealing hole at the fixed position of the fixed sleeve and the rod body, and further finishing machining of the deep hole piston rod.
According to the invention, after one end of the rod body is inserted into the fixing sleeve and is fixed with the fixing sleeve, the fixing sleeve and the fixing position of the rod body are sequentially provided with the sealing hole and the threaded hole, so that the position requirements of verticality and coaxiality of the mounting seat and the sealing hole communicated with the deep hole in the prior art are avoided, and the heat generated during the welding of the mounting seat and the rod head is easy to deform the sealing hole under the mounting seat, thereby avoiding secondary processing of the sealing hole, reducing the manufacturing cost and shortening the manufacturing period.
As a preferred embodiment, referring to fig. 5, step S300: when the fixed position of fixed cover and body of rod sets gradually sealed hole and screw hole, include:
s301, a through hole which penetrates through the side wall of the fixed sleeve and is communicated with the deep hole is formed in the fixed position of the fixed sleeve and the rod body;
s302, reaming one end of the through hole far away from the deep hole to form a threaded hole on the side wall of the fixed sleeve and the outer wall of the rod body close to the fixed sleeve, wherein the position of the through hole which is not reamed is a sealing hole;
wherein, the axis of through-hole is perpendicular with the axis of deep hole.
In this embodiment, a through hole penetrating through the side wall of the fixed sleeve and communicating with the deep hole is formed in the fixed position of the fixed sleeve and the rod body, and then on the basis of the through hole, one end of the through hole far away from the deep hole is subjected to reaming processing, so that the processing of the threaded hole is completed, and the perpendicularity between the through hole and the deep hole and the coaxiality between the threaded hole and the sealing hole can be ensured.
As a preferred embodiment, the processing method of the deep hole piston rod further includes: an inserting part is processed at one end of the rod body, the length of the inserting part is smaller than that of the fixing sleeve, and the outer diameter of the inserting part is smaller than the inner diameter of the fixing sleeve and larger than the outer diameter of the rest position of the rod body.
As a preferred embodiment, referring to fig. 6, step S200: when inserting the one end of the body of rod into fixed cover and fixed with fixed cover, include:
s201, inserting an insertion part of the rod body into the fixed sleeve;
s202, extending the insertion part into one end of the fixed sleeve and fixedly connecting the insertion part with the fixed sleeve through welding;
s203, fixedly connecting one end of the insertion part, which is close to the outer side of the fixed sleeve, with the fixed sleeve through welding.
The third aspect of the invention provides a hydraulic support side-pushing jack, which comprises a deep hole piston rod of the side-pushing jack and a deep hole piston rod processed by the processing method of the deep hole piston rod of the side-pushing jack.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. The deep hole piston rod of the side-pushing jack is characterized by comprising a rod body and a fixed sleeve, wherein a deep hole and a sealing hole communicated with the deep hole are formed in the rod body; one end of the rod body is inserted into the fixing sleeve and is fixed with the fixing sleeve, a threaded hole is formed in the fixing position of the fixing sleeve and the rod body, and the threaded hole penetrates through the side wall of the fixing sleeve and is communicated with the sealing hole;
the rod body comprises an insertion part arranged on one side of the rod body, the insertion part is inserted into one side of the fixed sleeve and is fixed with the fixed sleeve, the length of the insertion part is smaller than that of the fixed sleeve, and the outer diameter of the insertion part is smaller than the inner diameter of the fixed sleeve.
2. A deep hole piston rod of a side-pushing jack according to claim 1, wherein the axis of the sealing hole is perpendicular to the axis of the deep hole, the axis of the sealing hole and the axis of the threaded hole are on the same straight line, and the aperture of the threaded hole is larger than the aperture of the sealing hole.
3. The deep hole piston rod of a side-pushing jack of claim 1, wherein both ends of the insertion portion are fixedly connected to the fixing sleeve by welding, respectively.
4. A deep hole piston rod for a side-pushing jack according to claim 1, wherein the diameter of the rod body is smaller than the diameter of the insertion portion.
5. The method for machining the deep hole piston rod of the side-pushing jack is characterized by comprising the following steps of:
processing two parallel deep holes in the rod body;
inserting one end of the rod body into the fixing sleeve and fixing the rod body with the fixing sleeve;
a sealing hole communicated with the deep hole and a threaded hole penetrating through the side wall of the fixing sleeve and communicated with the sealing hole are sequentially formed in the fixing position of the fixing sleeve and the rod body, and further the machining of the deep hole piston rod is completed;
an insertion part is machined at one end of the rod body, the length of the insertion part is smaller than that of the fixing sleeve, and the outer diameter of the insertion part is smaller than the inner diameter of the fixing sleeve and larger than the outer diameter of the rest position of the rod body.
6. The method for machining a deep hole piston rod of a side-pushing jack according to claim 5, wherein when the fixing sleeve and the fixing position of the rod body are sequentially provided with a sealing hole and a threaded hole, comprising:
a through hole which penetrates through the side wall of the fixed sleeve and is communicated with the deep hole is formed in the fixed position of the fixed sleeve and the rod body;
reaming one end of the through hole far away from the deep hole to form a threaded hole on the side wall of the fixed sleeve and the outer wall of the rod body close to the fixed sleeve, wherein the position of the through hole which is not reamed is a sealing hole;
wherein the axis of the through hole is perpendicular to the axis of the deep hole.
7. The method of claim 5, wherein the step of inserting one end of the rod into the fixing sleeve and fixing the rod to the fixing sleeve comprises:
inserting the insertion portion of the rod body into the fixing sleeve;
the insertion part extends into one end of the fixed sleeve and is fixedly connected with the fixed sleeve through welding;
and fixedly connecting one end of the insertion part, which is close to the outer side of the fixed sleeve, with the fixed sleeve through welding.
8. A hydraulic support side-pushing jack, characterized by comprising a deep hole piston rod of the side-pushing jack according to any one of claims 1 to 4 and a deep hole piston rod processed by the method of processing a deep hole piston rod of the side-pushing jack according to any one of claims 5 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010222019.6A CN111453638B (en) | 2020-03-26 | 2020-03-26 | Deep hole piston rod of side-pushing jack and processing method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010222019.6A CN111453638B (en) | 2020-03-26 | 2020-03-26 | Deep hole piston rod of side-pushing jack and processing method and application thereof |
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| Publication Number | Publication Date |
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| CN111453638A CN111453638A (en) | 2020-07-28 |
| CN111453638B true CN111453638B (en) | 2023-09-15 |
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| CN113251026B (en) * | 2021-06-03 | 2024-02-06 | 一重集团大连工程技术有限公司 | Combined piston rod for stretcher and piston cylinder with piston rod |
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