CN210087782U - Pin shaft for underground coal mining support hydraulic support - Google Patents
Pin shaft for underground coal mining support hydraulic support Download PDFInfo
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- CN210087782U CN210087782U CN201921016557.9U CN201921016557U CN210087782U CN 210087782 U CN210087782 U CN 210087782U CN 201921016557 U CN201921016557 U CN 201921016557U CN 210087782 U CN210087782 U CN 210087782U
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- side screw
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Abstract
The utility model discloses a round pin axle for strutting hydraulic support in coal mining pit, including the round pin axle body that can run through hydraulic support cotter hole round pin axle body terminal surface week side equipartition has the side screw more than at least one. This scheme realizes pulling out the increase of round pin dynamics through the side screw hole that sets up at round pin axle body terminal surface week side equipartition, even with mode and side screw hole connection such as pulling out the round pin ware, can know according to the experimental data of the side screw power that the utility model provides people, pulls out the power that the round pin used at pulling out the round pin ware, nevertheless, the clamp force that its a plurality of side screw holes produced makes the round pin axle take out from the round pin hole.
Description
Technical Field
The utility model relates to a technical field of coal development, concretely relates to a round pin axle for supporting hydraulic support in coal mining pit.
Background
The hydraulic support is a structure used for controlling the mine pressure of a coal face, and consists of a hydraulic cylinder (upright post and jack), a bearing structural member (top beam, shield beam, base and the like), a pushing device, a control system and other auxiliary devices. The hydraulic support is installed in the emulsion pump station of the tunnel or chamber to supply liquid.
After the pressure emulsion enters the upright post through the control system, the support raises the primary support top plate, the support resistance of the support to the top plate is increased along with the sinking of the top plate, the pressure of the locking liquid in the upright post is limited by the safety valve, and the constant-resistance support is realized. When the support is moved, the vertical column is firstly reduced to enable the support to be unloaded and separated from the top plate, then the jack is moved, the support is moved by taking the conveyor (or an adjacent support and the like) as a fulcrum, and then the conveyor is moved by taking the supported support as the fulcrum. The hydraulic support can also realize various auxiliary actions such as side protection, balance, support adjustment and the like through various jacks, thereby realizing comprehensive mechanization of coal falling, support and transportation of a working face by matching with a coal mining machine and a scraper conveyor.
However, the hydraulic support is used in the underground for a long time, and under the severe underground environment and heavy-load operation, a pin shaft on the hydraulic support is easy to rust, some rust is serious, a groove step is formed in severe abrasion, and the hydraulic support is difficult to disassemble; most of pin shafts of the hydraulic support are phi 160, and some pin shafts are smaller than phi 160, and the diameter of the pin shafts is basically between phi 120 and phi 160; meanwhile, the hydraulic support is also deformed and bent under pressure, and the pin shaft is easily locked in the pin hole of the hydraulic support due to bending deformation, so that the pin shaft of the hydraulic support is difficult to take out by using a pin puller.
Therefore, when the hydraulic support is actually disassembled underground, a stuck blasting method is usually used for the pin shaft locked in the pin hole, wherein the stuck blasting method is that explosives are stuck on the surface of the pin shaft, personnel are removed from the pin shaft for detonation, and a large impact force is generated in an explosive blasting mode to loosen the pin shaft and the pin hole so that the pin shaft moves a little distance; however, this method is dangerous, not only does not meet the requirements of safety operation specifications in the well, but also easily causes coal dust explosion, damages to parts such as the pin shaft, such as deformation, fracture, bending, etc., which increases the difficulty of repairing the pin shaft secondarily, aggravates the construction difficulty, and wastes time.
SUMMERY OF THE UTILITY MODEL
The aforesaid that exists to prior art is not enough, the utility model discloses a how to solve the round pin axle on the hydraulic support and in the downthehole locking of pin to be difficult to the problem of taking out hydraulic support's round pin axle.
Solve the technical problem, the utility model discloses a following technical scheme:
the pin shaft for the underground coal mining support hydraulic support comprises a pin shaft body which can penetrate through a pin hole of the hydraulic support, wherein a central screw hole is formed in the middle of the end face of the pin shaft body, and at least one group of side screw holes are formed in the peripheral side of the end face of the pin shaft body.
According to the scheme, the central screw hole and the group of side screw holes are formed in the peripheral side of the end face of the pin shaft body, the screw rod is screwed into the screw hole, and is connected with the screw rod in the screw hole in a matched mode of using a pin puller and the like, and the screw rod is pulled outwards under the action of external force to further pull out the pin shaft body; according to the utility model discloses the experimental data of the side screw hole atress that the people provided can know, pull out the power that the round pin was used at the pin pulling device and reduce, however, the clamp force that its a plurality of side screw holes produced makes the round pin axle take out from the pin hole.
Further, a group of side screw holes are respectively arranged on two sides of the central screw hole. And the side screw holes are respectively arranged on two sides of the central screw hole, so that the force on two sides of the pin shaft body is pulled under the pulling force of the pin puller.
Furthermore, a set of side screw holes are symmetrically arranged along the diameter of the pin shaft body. The side screw holes are designed to be symmetrically arranged side screw holes, so that the symmetrically arranged side screw holes are uniformly stressed in the pin pulling process, and therefore, the stress of the side screw holes is concentrated, and the pin shaft can be skillfully and laborsavingly pulled out.
Further, the distance from the center point of the side screw hole to the side surface of the pin shaft body is 1/3 of the distance from the center point of the side screw hole to the center point of the center screw hole. The central screw hole is arranged at the central point of the pin shaft body and can be matched with the pin puller, the central screw hole and the side screw hole jointly generate clamping force on the pin shaft, and the pin shaft is pulled out under the action of the pin puller.
Further, the hole depth of the side screw hole is smaller than that of the central screw hole. Design like this for the pulling force that the screw rod of pin puller produced the central screw is greater than the pulling force that the screw rod offside screw of pin puller produced, can avoid being located the side screw atress of round pin axle end face week side too big like this, and then round pin axle end face week side produces deformation.
Further, the diameter of the central screw hole is larger than that of the side screw holes. The design makes the central screw hole bear the pulling force of the main pin puller, and the side screw holes bear the dispersed stress, so that the stress of the central point of the pin shaft is prevented from being too concentrated, and the pin shaft is prevented from being damaged.
Further, the nominal diameter of the central screw hole is 36mm, and the nominal diameter of the side screw hole is 22 mm.
Further, the diameter of the central screw hole is equal to the diameter of the side screw holes. The design is convenient for increasing the interchangeability of the screw rod of the pin puller, and the screw rod can be suitable for the central screw hole and the side screw holes only by manufacturing the screw rod with one size.
Further, the number of the side screw holes is 2, 4, 6 or 8.
Compared with the prior art, the utility model has the advantages of as follows:
1. the utility model discloses a screw rod and side screw, the central screw of pulling out the round pin ware cooperate, and then side screw and central screw all press from both sides tightly pulling out the round pin ware for pull out the stress dispersion that the round pin ware produced to the round pin axle, let round pin axle head face week all receive the pulling force in week and the center, and then light will sell the axle and follow the downthehole extraction of pin.
2. The utility model discloses a plurality of side screw holes realize pulling out of round pin axle, and the round pin axle is pulled out the back, can carry out simple restoration or secondary operation, and the round pin axle after restoreing or processing can be reused, realizes saving the cost like this.
Drawings
Fig. 1 is the schematic diagram of the pin shaft for the hydraulic support of the present invention.
Fig. 2 is a top view of the pin of fig. 1 for a hydraulic mount.
In the figure: the hinge pin comprises a hinge pin body 1, side screw holes 2 and a central screw hole 3.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
In this embodiment: referring to fig. 1 and 2, the pin shaft for supporting the hydraulic support in the coal mining well comprises a pin shaft body 1 which can penetrate through a pin hole of the hydraulic support, wherein a central screw hole 3 is formed in the middle of the end face of the pin shaft body 1, at least one group of side screw holes 2 are formed in the peripheral side of the end face of the pin shaft body 1, and the number of the side screw holes 2 is 2, 4, 6 or 8.
A set of side screw 2 sets up the both sides at central screw 3 respectively, and a set of side screw 2 sets up along round pin axle body 1 diameter symmetry, and simultaneously, the distance of side screw 2 central point to round pin axle body 1 side is 1/3 of the distance of side screw 2 central point to central screw 3 central point, and in addition, the hole depth of side screw 2 is less than the hole depth of central screw 3, the diameter of central screw is greater than the diameter of side screw, or the diameter of central screw 3 equals with the diameter of side screw 2, the nominal diameter of central screw is 36mm, the nominal diameter of side screw is 22 mm.
The diameter of the central screw hole is larger than that of the side screw holes, so that the central screw hole 3 bears the tension of a main pin puller, and the side screw holes 2 bear dispersed stress, so that the stress of the central point of the pin shaft is prevented from being excessively concentrated, and the pin shaft is prevented from being damaged. Or the diameter of the central screw hole 3 is equal to that of the side screw holes 2, so that the interchangeability of the screw rods of the pin puller is convenient to increase, and the screw rods can be suitable for the central screw hole 3 and the side screw holes 2 only by making the screw rods with one size.
In addition, a group of side screw holes 2 are respectively arranged at two sides of the central screw hole 3, and the group of side screw holes 2 are symmetrically arranged, so that the force at two sides of the pin shaft body 1 is ensured to be pulled under the pulling force of the pin puller at the pin shaft body 1, and therefore, the stress of the side screw holes 2 is concentrated, and the pin shaft can be skillfully and laborsavingly pulled out.
The central screw hole 3 arranged at the central point of the pin shaft body 1 can also be matched with a pin puller, and the pin shaft is pulled out under the action of the pin puller by generating clamping force on the pin shaft through the central screw hole 3 and the side screw holes 2 together. Meanwhile, the tensile force generated by the screw rod of the pin puller on the central screw hole 3 is greater than the tensile force generated by the screw rod of the pin puller on the side screw hole 2, so that the phenomenon that the side screw hole 2 on the periphery of the end face of the pin shaft is excessively stressed and the periphery of the end face of the pin shaft is deformed can be avoided.
Therefore, the pin shaft is pulled out through the side screw holes 2, after the pin shaft is pulled out, simple repair or secondary processing can be carried out, the repaired or processed pin shaft can be reused, and cost is saved.
In order to further verify the beneficial effects of the utility model discloses a, the utility model discloses the people has made following experiment to the round pin axle:
1. force analysis
The installation and placement of the hydraulic support are changed along with the change of the coal seam due to the fact that the coal seam is mined at a certain inclination angle, comprehensive stress factors are considered, and the matching of the pin shaft and the hydraulic support is greatly different due to the severe degree of working conditions; the error between the pin hole of the hydraulic support with the large inclination angle and the pin shaft (the diameter phi 160) is less than or equal to 0.5mm, and the stress of the pin shaft of the hydraulic support of the mine in Chongqing is analyzed, so that the method mainly comprises the following points: (1) the part of the top plate and the tail part of the hydraulic support connected by the pin shaft and the pin shaft are seriously rusted due to the working environment, and resistance is generated on the mutual movement of the hole shaft and the pin shaft of the hydraulic support; (2) due to the long-time (more than 3 months) working stress state of the support top beam, the shield beam and the base, the hinge holes of the support top beam, the shield beam and the base are not concentric, so that the pin shaft bears complex radial force to increase the friction force of the hole shaft. In order to pull out the pin shaft, a pulling force of about 180 tons needs to be applied.
2. Pin shaft end part center screw hole thread strength checking
(1) Calculation of tensile strength of central screw thread
The nominal diameter of the central screw hole is not smaller than that of the side screw hole, and the nominal diameter D =36mm and the thread pitch P =4 of the central screw hole are selected in the calculation; the depth L of the threaded hole is more than or equal to 40 mm; the screw rod is made of 35CrMo alloy structural steel, sigmab=980MPa
The material of the pin shaft is as follows: 27SiMn, σ b =980 MPa;
stress cross-sectional area: as =0.7854 (d-0.9328P) parent member =817mm
Guarantee load F1= As × σ b =800660N =80.07t
(2) Tensile strength of pull rod matched with central screw hole (reverse calculation pull rod strength)
Screw specification M36, stress cross-sectional area: as =0.7854 (d-0.9328P) parent member =817mm
The screw material is 35CrMo alloy structural steel, Sp = sigma b =1200MPa
F2=As×σb=As×Sp=817×1200=980400N≈98.04t
F1＜F2
Therefore, the safety of the thread in the threaded hole of the pin shaft is lower than that of the screw rod when the thread is pulled; when the pin pulling force used by the shaft puller is about 180t, and the required pin pulling force F =180t is more than F2=98.04t is more than F1=80.07t, the thread of the pin shaft cannot bear.
Therefore, a 6-M22 thread is drilled and tapped on the end face of the pin shaft with the original diameter phi 160, and the pin shaft is drawn by a lengthening screw rod matched with a piercing jack.
3. Pin shaft end side screw hole thread strength checking
(1) Calculation of tensile strength of screw threads of side screw holes
The nominal diameter of the side screw hole is smaller than or equal to the nominal diameter of the central screw hole, the specification M22 of the internal thread of the side screw hole is selected in the calculation, and the thread pitch P =2.5 mm;
the material of the pin shaft is as follows: 27SiMn, σ b =980 MPa;
stress cross-sectional area: as =0.7854 (d-0.9328P) stand-alone device =303mm
Guarantee load F3= As × σ b =296940N =30.3t
(2) Tensile strength of tie rod matched with side screw hole (reverse calculation tie rod strength)
Screw specification M =22, stress cross-sectional area: as =0.7854 (d-0.9328P) stand-alone device =303mm
The screw material is 35CrMo alloy structural steel, Sp = sigma b =1200MPa
F4=As×σb=As×Sp=303×1200=363600N≈37.1t
F3＜F4
Therefore, 6M 22 screws (12.9 grade) can bear 30.3 tons of tension each, then the shaft is drilled and tapped again at the end face of the pin shaft to 6-M22, 30.3 multiplied by 6 ≈ 181.8 tons of tension are obtained, the original M36 thread is reserved at the center, 1M 36 screw (12.9 grade) can bear 80.07 tons of tension, and the pin shaft can be designed to bear 181.8+80.07=261.87 tons of tension.
In addition, considering the stress difference of the bolt groups, the unbalance coefficient K =1.2 is taken
The design pin shaft bears the tensile force Fs = Fl/K =261.87/1.2=218.2t > F =180t
Through the increase of the round pin dynamics of pulling out of a set of side screw 2 realization that set up in 1 terminal surface week side of round pin axle body, even with mode such as pulling out the round pin ware and be connected with side screw 2, can know according to the experimental data of the side screw 2 atress that the utility model discloses the people provided, pull out the power that the round pin was used at pulling out the round pin ware and reduce, nevertheless, the clamp force that its a plurality of side screw 2 produced makes the round pin axle take out from the round pin hole.
Simultaneously, the screw rod through pulling out the round pin ware cooperatees with side screw hole 2, central screw hole 3, and then side screw hole 2 and central screw hole 3 all press from both sides tightly the round pin ware, make the stress dispersion of pulling out round pin axle production of round pin ware, let round pin axle end face week all receive the pulling force in side and the center, and then light will sell the axle and follow the downthehole extraction of pin.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that those modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all should be covered in the scope of the claims of the present invention.
Claims (9)
1. The pin shaft for the underground coal mining support hydraulic support comprises a pin shaft body which can penetrate through a pin hole of the hydraulic support, and is characterized in that a central screw hole is formed in the middle of the end face of the pin shaft body, and at least one group of side screw holes are formed in the periphery of the end face of the pin shaft body.
2. The pin for a coal mining underground support hydraulic bracket according to claim 1, wherein a group of the side screw holes are respectively provided on both sides of the central screw hole.
3. The pin for a coal mining underground support hydraulic support according to claim 1, wherein a group of the side screw holes are symmetrically arranged along a diameter of the pin body.
4. The pin of claim 1, wherein the distance from the center point of the lateral screw hole to the side of the pin body is 1/3 times the distance from the center point of the lateral screw hole to the center point of the central screw hole.
5. The pin for a coal mining underground support hydraulic support according to claim 1, wherein a hole depth of the side screw hole is smaller than a hole depth of the center screw hole.
6. The pin for a coal mining downhole support hydraulic support according to any one of claims 1 to 5, wherein the diameter of the central screw hole is larger than the diameter of the side screw holes.
7. The pin for a coal mining underground support hydraulic support according to claim 6, wherein the nominal diameter of the central screw hole is 36mm, and the nominal diameter of the side screw hole is 22 mm.
8. The pin for a coal mining downhole support hydraulic support according to any one of claims 1 to 5, wherein the diameter of the central screw hole is equal to the diameter of the side screw holes.
9. The pin for a coal mining underground supporting hydraulic support according to any one of claims 1 to 5, wherein the number of the side screw holes is 2, 4, 6 or 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921016557.9U CN210087782U (en) | 2019-07-02 | 2019-07-02 | Pin shaft for underground coal mining support hydraulic support |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921016557.9U CN210087782U (en) | 2019-07-02 | 2019-07-02 | Pin shaft for underground coal mining support hydraulic support |
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| CN210087782U true CN210087782U (en) | 2020-02-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110131271A (en) * | 2019-07-02 | 2019-08-16 | 重庆宝润矿山机械制造有限公司 | Pin shaft for underground hydraulic support of mining |
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2019
- 2019-07-02 CN CN201921016557.9U patent/CN210087782U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110131271A (en) * | 2019-07-02 | 2019-08-16 | 重庆宝润矿山机械制造有限公司 | Pin shaft for underground hydraulic support of mining |
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