CN209850805U - Crank pin bush taking-out device - Google Patents

Abstract

The utility model provides a crank pin bush taking-out device, which comprises a support body, a central rod and a pull head, wherein the pull head is used for taking the support body as a basis and is in stop fit with a bush to be taken so as to pull out the bush to be taken; or the other end of the pull head is rotatably assembled on the supporting body, and the supporting body at least stops the central rod from moving towards the pull head along the axial direction of the central rod. The utility model discloses under the prerequisite that has reduced operating personnel's intensity of labour, has improved the operating efficiency greatly, and do not need power drive device, only through well core rod, supporter, pull head alright completion, convenient to use, and need not use the high component part of price, have the lower advantage of cost.

Description

Crank pin bush taking-out device

Technical Field

The utility model belongs to beam-pumping unit machine tool field, concretely relates to crank pin bush remove device.

Background

The beam-pumping unit adopts the main equipment of operation as the oil field, in actual work process, because reasons such as need often debug the stroke, change reducing gear box and crank pin, often will take out the crank pin bush. According to the traditional method, a copper bar is padded at one end of a crank pin bush, the copper bar is knocked by a hammer, so that the crank pin and the bush are loosened, and the bush is taken out. However, this method has the following disadvantages: firstly, the positions of knocking the hammer and placing the copper rod must be accurate, so that the requirement on the skill of an operator is high, and the end part of the knocked bushing deforms seriously, so that the bushing is scrapped; secondly, the method needs at least two persons to cooperate, and needs to stand on a reduction gearbox to operate, thereby wasting time and labor and having certain potential safety hazard.

The utility model discloses a chinese utility model patent document that bulletin number is CN203542523U discloses a novel beam-pumping unit crank pin bush takes out device, including well core rod, well core rod's right-hand member is connected with the nut, and well core rod's left end is provided with the support, and the left side of nut is provided with hollow jack, and hollow jack is driven by the power supply, and hollow jack's left end is equipped with the kicking block, and during the use, through power supply drive hollow jack, hollow jack promotes its left kicking block ejecting from the crank pin with the crank pin bush.

Firstly, the power source is an indispensable tool for driving the hollow jack, and once the power source is absent or fails, the device cannot be used; secondly, the cost of the taking-out device is high after the power source and the hollow jack are used.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a convenient to use, lower crank pin bush remove device of cost.

In order to achieve the above object, the utility model discloses crank pin bush remove device adopts following technical scheme:

a crank pin bush taking-out device comprises a support body, a central rod and a pull head, wherein the pull head is used for being matched with a bush to be taken in a stopping mode on the basis of the support body so as to pull out the bush to be taken; or the other end of the pull head is rotatably assembled on the supporting body, and the supporting body at least stops the central rod from moving towards the pull head along the axial direction of the central rod.

The utility model discloses a theory of operation: the central rod is in threaded fit with the support body or is in rotating assembly fit with the support body, then penetrates through the crank pin to be in threaded connection with the pull head, the middle of the pull head is subjected to rotation stopping operation by using a wrench, torque is applied to a tool fitting section of one end portion, away from the pull head, of the central rod, the support body is in contact with the crank pin and plays a stopping role due to the threaded fit or rotating assembly fit of the central rod and the support body, and the pull head moves towards the middle of the central rod under the rotation of the central rod and is in stopping fit with the bush to be taken so as to pull out the bush to be.

The utility model has the advantages that: the utility model discloses crank pin bush remove device, under the prerequisite that has reduced operating personnel's intensity of labour, has improved the operating efficiency greatly, do not need power drive, only through well core rod, supporter, pull head alright completion, convenient to use, and need not use the high component part of price, have the lower advantage of cost.

Further, the support body has an insertion portion for insertion into a mounting hole where the bush to be taken out is located with rotation stopping. The insertion part can avoid the 'connecting shaft rotation' while the support body is contacted with the crank pin to play a supporting role.

Further, the space enclosed by the insertion part of the support body can meet the requirement that the bush to be taken enters the space. This space ensures that the bush to be taken is completely accommodated in the support body after being pulled out of the crank pin by the slider.

Furthermore, a tool matching section penetrating out of the support body is arranged at the end part of the center rod close to one end of the support body, and a matching structure used for matching with a tool for applying torque is arranged on the tool matching section.

Furthermore, the pull head is in a dumbbell-shaped structure, and the end part of the pull head is provided with a knocking head. When the crank pin is connected with the bush to be taken too tightly, the hammer can be used for striking the striking head, so that the bush is loosened.

Further, the other end of the pull head is provided with a step surface which is used for being matched with the bush to be taken in a pushing mode, and a copper gasket is arranged on the step surface. The step surface can play the effect of pushing away the bush of waiting to get at the in-process that the pull head pulled out the bush of waiting to get, in addition, when the crank pin was connected too tightly with the bush of waiting to get, need use the hammer to beat and strike the head, and the copper packing ring can play the effect of transmission power.

Furthermore, the outer surface of the pull head is provided with a rotation stopping surface matched with the wrench. In the rotation stopping operation, a wrench may be used to grip the outer surface of the slider.

Drawings

FIG. 1 is a schematic structural view of the crank pin bush removing device of the present invention;

fig. 2 is a left side view of the support body of the present invention;

FIG. 3 is a cross-sectional view of the support structure of the present invention taken along the line A-A in FIG. 2;

fig. 4 is a front view of the center pole of the present invention;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;

FIG. 6 is a front half-sectional view of the middle pull head of the present invention;

FIG. 7 is a cross-sectional view of the copper washer of the present invention in a radial direction;

reference numerals: 1-support body, 101-left-handed threaded hole, 102-insertion part, 2-center rod, 201-left-handed thread, 202-right-handed thread, 3-pull head, 301-right-handed threaded hole, 302-step surface, 303-knocking head and 4-copper washer.

Detailed Description

The following describes the present invention with reference to the accompanying drawings.

As shown in fig. 1, the device for taking out a crank pin bush comprises a central rod support body 1, a central rod 2 and a pull head 3, wherein the pull head 3 is used for being matched with the bush to be taken in a stopping manner on the basis of the support body 1 to pull out the bush to be taken, one end of the central rod 2 is in threaded fit with the pull head 3, the other end of the central rod 2 is in reverse threaded fit with the support body 1, one end of the support body 1 is the left side of the central rod 2, a step surface 302 used for being matched with the bush to be taken in a pushing manner is arranged at the end part of the left side of the pull.

As shown in fig. 2 to 3, a left-handed threaded hole 101 for the central rod 2 to pass through is formed in the center of the bottom of the support body 1, the inner diameter of the support body 1 is larger than the outer diameter of the bushing, the length in the axial direction is larger than the length of the bushing in the axial direction, and it is ensured that the bushing to be taken can be completely accommodated in the support body 1 after being ejected.

Further, the outer surface of the support body 1 is cut off through two parallel surfaces to form two insertion parts 102, and the outer diameter of the support body 1 is smaller than the inner diameter of the mounting hole where the bush to be taken is located, so that the insertion parts formed after the support body 1 is cut off through the two parallel surfaces can be inserted into the mounting hole where the bush to be taken is located to perform rotation stopping. In other embodiments, one end of the center post may be rotatably mounted to a support that axially blocks the center post from moving closer to the pull head or from moving closer to or away from the pull head along the center post.

As shown in fig. 4 to 5, the left end of the central rod 2 is designed with a hexagonal structure penetrating out of the supporting body 1, and the hexagonal structure can be clamped by a wrench to apply torque to drive the central rod 2 to rotate. In other embodiments, the left end of the central rod may be provided with a through hole along the radial direction, and the central rod may be driven to rotate by inserting the operating rod, or the left end of the central rod may be designed as a cross handle.

Further, the center rod 2 is provided with a left-hand thread 201 and a right-hand thread 202.

As shown in fig. 6 to 7, the slider 3 is of a dumbbell-shaped structure, and the left end of the slider 3 is provided with a step surface 302 for being in pushing fit with the bush to be taken, and is provided with a right-handed threaded hole 301 in threaded fit with the central rod 2. In other embodiments, the step surface may be designed as a pushing edge, and an outer diameter of the pushing edge is larger than an inner diameter of the bushing and smaller than an outer diameter of the bushing, so as to perform a pushing function.

Further, the right end of the pull head is provided with a knocking head 303, and when the crank pin is connected with the bush to be taken too tightly, the knocking head 303 can be struck by a hammer to loosen the bush. In other embodiments, the design of the knocking head can be eliminated, and the right-handed threaded hole formed in the pull head is designed to be a threaded hole penetrating along the axial direction.

Further, the middle part of the pull head 3 is of a hexagonal structure capable of performing rotation stopping operation, and the pull head 3 can be clamped by a wrench to stop rotation in the hexagonal structure. In other embodiments, the hexagonal structure may be designed as other polygonal structures.

Fig. 7 is a cross-sectional view of the copper gasket 4 in the radial direction according to the present invention. When the hammer is used to strike the striking head 303, the copper washer 4 may act to transmit power.

Claims (7)

1. The utility model provides a crank pin bush remove device which characterized in that: the pull head is used for being matched with a bush to be taken in a stopping way on the basis of the support body so as to pull out the bush to be taken, one end of the center rod is in threaded fit with the pull head, and the other end of the center rod is in reverse threaded fit with the support body; or the other end of the pull head is rotatably assembled on the supporting body, and the supporting body at least stops the central rod from moving towards the pull head along the axial direction of the central rod.

2. The crank pin bushing extraction apparatus of claim 1, wherein: the support body is provided with an insertion part for inserting into the mounting hole of the bush to be taken in a rotation stopping way.

3. The crank pin bushing extraction apparatus of claim 2, wherein: the space enclosed by the insertion part of the support body can be used for the insertion of the bush to be taken.

4. The crank pin bushing extraction apparatus of claim 1, wherein: the end part of the center rod, which is close to one end of the support body, is provided with a tool matching section which penetrates out of the support body, and the tool matching section is provided with a matching structure which is used for matching with a tool for applying torque.

5. The crank pin bushing extraction apparatus of claim 1, wherein: the pull head is of a dumbbell-shaped structure, and a knocking head is arranged at the end part of the pull head.

6. The crank pin bushing extraction apparatus of claim 5, wherein: the other end of the pull head is provided with a step surface which is used for being matched with the bush to be taken in a pushing mode, and a copper gasket is arranged on the step surface.

7. A crank pin bushing extraction arrangement according to claim 5 or 6, wherein: and the outer surface of the pull head is provided with a rotation stopping surface matched with the wrench.