CN211708517U - Cylinder cap welding frock - Google Patents

Cylinder cap welding frock Download PDF

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Publication number
CN211708517U
CN211708517U CN201922449863.8U CN201922449863U CN211708517U CN 211708517 U CN211708517 U CN 211708517U CN 201922449863 U CN201922449863 U CN 201922449863U CN 211708517 U CN211708517 U CN 211708517U
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CN
China
Prior art keywords
workbench
supporting seat
driving mechanism
unit
rotating unit
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Active
Application number
CN201922449863.8U
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Chinese (zh)
Inventor
张宜晚
夏志军
高艳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yangzhou Jinyuan Robotics Automation Co ltd
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Yangzhou Jinyuan Robotics Automation Co ltd
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Priority to CN201922449863.8U priority Critical patent/CN211708517U/en
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Abstract

The utility model discloses a cylinder cap welding frock. The cylinder cover welding tool comprises a driving rotating unit, a workbench rotating unit, a supporting unit and a centering unit, wherein the workbench rotating unit is installed on the driving rotating unit, the workbench is installed on the workbench rotating unit, and the supporting unit and the centering unit are installed on the workbench; the supporting unit comprises a supporting seat and a supporting seat driving mechanism, the supporting seat driving mechanism is provided with a plurality of clamping jaws which are arranged in a surrounding mode, the supporting seat driving mechanism is installed on the workbench, the supporting seat driving mechanism is provided with a first movable end which moves along a straight line, the supporting seat is installed on the first movable end, the upper end face of the supporting seat is an inclined plane which inclines towards the clamping jaws, and the supporting seat driving mechanism is used for driving the supporting seat to move towards or away from the clamping jaws. Can realize stabilizing the function of centre gripping cylinder cap through centering unit and supporting unit, rotate the multi-angle rotation that the unit can realize the cylinder cap through initiative rotation unit, workstation rotation unit, make things convenient for the welding, improved welded efficiency.

Description

Cylinder cap welding frock
Technical Field
The utility model relates to a welding frock, in particular to stoving section of thick bamboo cylinder cap frock for welding.
Background
A stoving section of thick bamboo need weld the barrel and the cylinder cap of a stoving section of thick bamboo in manufacturing process, need carry out the centre gripping to the cylinder cap with special fixture during the welding, and stoving section of thick bamboo class product size, the specification is various, and conventional anchor clamps are difficult to satisfy the cylinder cap centre gripping demand of different sizes, specification, and all need artifical manual use special fixture to carry out the centre gripping to the cylinder cap, thereby centre gripping inefficiency, the centre gripping effect is poor, and traditional anchor clamps mainly used matches manual welding, is difficult to satisfy automated production's demand.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a cylinder cap welding frock can carry out stable centre gripping to the cylinder cap to be applicable to the cylinder cap of different specifications, size.
In order to realize the above utility model purpose, the utility model relates to a cylinder cap welding frock adopts following technical scheme:
a cylinder cover welding tool comprises an active rotating unit, a workbench rotating unit, a supporting unit and a centering unit, wherein the workbench rotating unit is installed on the active rotating unit, the workbench is installed on the workbench rotating unit, and the supporting unit and the centering unit are installed on the workbench; the active rotating unit comprises a rotating driving mechanism and a bracket, the bracket is arranged on the rotating driving mechanism, the rotating driving mechanism is used for driving the bracket to rotate around a horizontal axis, the workbench rotating unit is arranged on the bracket, and the workbench rotating unit is used for driving the workbench to rotate; the centering unit comprises a clamping jaw driving mechanism and a clamping jaw, the clamping jaw driving mechanism is installed in the middle of the workbench, the clamping jaw is installed on the clamping jaw driving mechanism, and the clamping jaw driving mechanism is used for driving the clamping jaw to be clamped in a through hole formed in the cylinder cover along the axis; the supporting unit comprises a supporting seat and a supporting seat driving mechanism, the supporting seat driving mechanism is provided with a plurality of supporting seats and surrounds the clamping jaw, the supporting seat driving mechanism is installed on the workbench, the supporting seat driving mechanism is provided with a first movable end along the linear motion, the supporting seat is installed at the first movable end, the upper end face of the supporting seat faces the inclined plane of the clamping jaw, and the supporting seat driving mechanism is used for driving the supporting seat to face or keep away from the clamping jaw.
The utility model discloses the during operation, according to the external diameter of cylinder cap, adjust the supporting seat to suitable position through supporting seat actuating mechanism, the cylinder cap of treating welding is placed in the supporting seat up end, because a plurality of supporting seat up end all are the inclined plane towards the clamping jaw slope, thereby a plurality of inclined planes form V-arrangement groove structure, make placing in the inclined plane upper end that the cylinder cap can be stable, and simultaneously, place the clamping jaw in the through-hole that the axis was seted up is followed to the cylinder cap, make through clamping jaw actuating mechanism, the clamping jaw joint is in the through-hole that the cylinder cap axis was seted up, again according to the welding requirement, through initiative rotation unit, workstation rotation unit drive cylinder cap rotates, thereby the convenience welds the cylinder cap, thereby improve the degree of automation of.
Compared with the prior art, the beneficial effects of the utility model reside in that: can realize stabilizing the function of centre gripping cylinder cap through centering unit and supporting unit to keep the stability of cylinder cap among the welding process, rotate the multi-angle that the unit can realize the cylinder cap through initiative rotation unit, workstation and rotate the unit and rotate, convenient welding has improved welded efficiency, has improved the degree of automation of this kind of frock.
On the basis of the technical scheme, the utility model discloses can also do as follows the improvement:
further: the clamping jaw driving mechanism is a finger cylinder. The beneficial effect of this step: the clamping jaw is driven to move towards or away from the center of the finger cylinder by the finger cylinder.
Further: the supporting seat driving mechanism comprises a trapezoidal lead screw, a lead screw nut, a supporting seat and a guide rail, the guide rail is installed on the workbench, the supporting seat is installed on the guide rail, the trapezoidal lead screw is rotatably connected to the supporting seat, the lead screw nut is installed on the trapezoidal lead screw, the supporting seat is installed on the lead screw nut, the guide rail is provided with a guide groove parallel to the axis direction of the trapezoidal lead screw, a guide boss is arranged at the lower end of the supporting seat, and the guide boss is slidably arranged in the guide groove. The beneficial effect of this step: through the rotation of drive trapezoidal lead screw to through the guide rail direction, thereby adjust the distance of supporting seat and clamping jaw, make the supporting seat can support the cylinder body of different sizes, specification.
Further: the rotary driving mechanism comprises a first support, a first motor, a transmission mechanism and a first flange connecting seat, the transmission mechanism is installed on the first support, the first motor and the first flange connecting seat are installed on the transmission mechanism, and the support is connected to the first flange connecting seat
Further: the workbench rotating unit comprises a second motor, the second motor is installed on the support, and the workbench is installed on an output shaft of the second motor.
Further: the device also comprises a passive rotating unit, wherein the passive rotating unit is arranged on the other side of the support relative to the active rotating unit, and the support is rotationally connected with the passive rotating unit. The beneficial effect of this step: stability in the support rotation process is improved through the passive rotation unit.
Further: the passive rotating unit comprises a second support and a second flange connecting seat, the second flange connecting seat is rotatably arranged on the second support, and the support is connected with the second flange connecting seat.
Further: the surface of the workbench is provided with a plurality of connecting holes, the guide rail is provided with waist-shaped holes, and the waist-shaped holes are used for being matched and connected with the connecting holes. The beneficial effect of this step: through the cooperation of waist type hole and different connecting holes, can change the position that the guide rail was installed in the workstation to the support range of supporting seat has been enlarged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a front view of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;
FIG. 4 is a partial enlarged view of B in FIG. 3;
FIG. 5 is an enlarged view of a portion C of FIG. 3;
FIG. 6 is a schematic view of the three-dimensional structure of the present invention
FIG. 7 is an enlarged view of a portion D of FIG. 6;
FIG. 8 is an enlarged view of a portion E of FIG. 7;
FIG. 9 is an enlarged view of a portion F of FIG. 3;
FIG. 10 is a schematic structural view illustrating the first support and the second support of the present invention are removed;
fig. 11 is a schematic structural view of the present invention during operation.
The device comprises a driving rotating unit 1, a 101 rotation driving mechanism, a 102 bracket, a 103 support I, a 104 motor I, a 105 transmission mechanism, a 106 flange connecting seat I, a 107 mounting plate I, a 108 mounting seat I, a 109 coupling I, a 110 speed reducer I, a 111 gear and a 112 external tooth slewing bearing, wherein the driving rotating unit is connected with the driving rotating unit through a driving shaft;
2, a workbench;
3, a workbench rotating unit, a second 301 motor, a second 302 mounting seat, a second 303 coupler, a second 304 speed reducer, a second 305 connecting plate and a flange seat 306;
4 centering unit, 401 jaw driving mechanism, 402 jaw, 403 rod one, 404 rod two, 405 rod three;
5, a supporting unit, 501, a supporting seat, 502, a driving mechanism of the supporting seat, 503, an inclined plane, 504, a trapezoidal screw, 505, a screw nut, 506, a guide rail, 507, a knob, 508, 509, 510, a guide groove and 511 bosses;
6 passive rotating unit, 601 second support, 602 toothless rotary bearing, 603 flange connecting seat two.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.
In the description of the present application, it is to 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," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience of description and simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
As shown in fig. 1, a cylinder cover welding tool comprises a driving rotating unit 1, a workbench 2, a workbench rotating unit 3, a centering unit 4 and a supporting unit 5, wherein the workbench rotating unit 3 is installed on the driving rotating unit 1, the workbench 2 is installed on the workbench rotating unit 3, and the supporting unit 5 and the centering unit 4 are installed on the workbench 2; the active rotating unit 1 is used for driving the workbench rotating unit 3 to rotate around a horizontal axis, the workbench rotating unit 3 is used for driving the workbench 2 to rotate around an axis in a vertical plane, and the centering unit 4 and the supporting unit 5 are matched with each other for use and are used for enabling a cylinder cover to be stably positioned on the workbench 2.
As shown in fig. 3 and 4, the active rotation unit 1 includes a rotation driving mechanism 101 and a bracket 102, the bracket 102 is mounted on the rotation driving mechanism 101, the rotation driving mechanism 101 is used for driving the bracket 102 to rotate around a horizontal axis, the rotation driving mechanism 101 includes a first support 103, a first motor 104, a transmission mechanism 105 and a first flange connection seat 106, the first motor 104 is a servo motor, the transmission mechanism 105 is mounted on the first support 103, the first motor 104 and the first flange connection seat are mounted on the transmission mechanism 105, the bracket 102 is connected with the first flange connection seat 106, and the rotation of the output shaft of the first motor 104 is transmitted to the first flange connection seat 106 through the transmission mechanism 105, so that the flange connection seat drives the bracket 102 to rotate around the; the transmission mechanism 105 comprises a first mounting plate 107, a first mounting seat 108, a first coupling 109, a first speed reducer 110, a gear 111 and an external-tooth slewing bearing 112, the first motor 104 is mounted on the first mounting seat 108, the first mounting seat 108 is mounted on the first speed reducer 110, an output shaft of the first motor 104 is connected with an input shaft of the first speed reducer 110 through the first coupling 109, the first speed reducer 110 is mounted on the first mounting plate 107, the first mounting plate 107 is mounted on the first support 103, the gear 111 is mounted on the output shaft of the first speed reducer 110, an inner ring of the external-tooth slewing bearing 112 is mounted on the first support 103, the gear 111 is in matched meshing engagement with an external tooth of the external-tooth slewing bearing 112.
As shown in fig. 3 and 5, the table rotating unit 3 is mounted on the bracket 102, the table rotating unit 3 includes a second motor 301, a second mounting seat 302, a second coupling 303, a second speed reducer 304, a second connecting plate 305 and a flange seat 306, the second motor 301 is mounted on the second mounting seat 302, the second mounting seat 302 is mounted on the second speed reducer 304, an output shaft of the second motor 301 is connected with an input shaft of the second speed reducer 304 through the second coupling 303, the second speed reducer 304 is mounted on the second mounting plate, the second mounting plate is mounted on the bracket 102, the flange seat 306 is mounted on an output end of the second speed reducer 304, and the table 2 is mounted on the flange seat.
As shown in fig. 2, the table 2 is a regular hexagon, and a plurality of attachment holes are formed in the surface of the table 2.
As shown in fig. 6 and 7, the centering unit 4 includes a clamping jaw driving mechanism 401 and a clamping jaw 402, the clamping jaw driving mechanism 401 is installed in the middle of the workbench 2, the clamping jaw driving mechanism 401 is a finger cylinder, the finger cylinder is a procurement part, such as a finger cylinder of SMC-MHS3-125D series, the finger cylinder is provided with a plurality of clamping jaws 402, the clamping jaws 402 are uniformly distributed on a circumference with an output shaft of the second motor 301 as a center line, the clamping jaw 402 includes a first rod 403, a second rod 404 and a third rod 405, the first rod 403 is transversely arranged and used for being connected with the finger cylinder, the second rod 404 is vertically arranged at the end of the first rod 403, the third rod 405 is arranged at the upper end of the second rod 404 and is perpendicular to the second rod.
As shown in fig. 7 and 8, the supporting unit 5 includes a supporting base 501 and a supporting base driving mechanism 502, the supporting base driving mechanism 502 has a plurality of supporting base 502 and is disposed around the clamping jaw 402, and more specifically, is disposed around the axis of the output shaft of the motor two 301, the supporting base driving mechanism 502 is mounted on the working platform 2, the supporting base driving mechanism 502 has a first movable end which moves along a straight line, the supporting base 501 is mounted on the first movable end, the upper end surface of the supporting base 501 is an inclined surface 503 which inclines towards the clamping jaw 402, the inclined surface 503 is used for placing a cylinder cover, and the supporting base driving mechanism 502 is used for driving the supporting base; the supporting seat driving mechanism 502 comprises a trapezoidal lead screw 504, a lead screw nut 505, a supporting seat 501, a guide rail 506 and a knob 507, wherein the two guide rails 506 are parallel to each other and arranged at intervals and installed on the workbench 2, the two supporting seats 501 are respectively a seat I508 and a seat II 509, the seat I508 is installed on one side of the guide rail 506 close to the clamping jaw 402, the seat II 509 is installed on one side of the guide rail 506 far away from the clamping jaw 402, the seat I508 is provided with a bearing connected with the trapezoidal lead screw 504, the seat II 509 is an EK12 series lead screw supporting seat 501 of Taiwan TBI, the trapezoidal lead screw is rotatably installed on the seat I508 and the seat II 509, one end of the trapezoidal lead screw 504 extends out of the seat II 509 and is provided with the knob 507, the trapezoidal lead screw is driven to rotate by rotating the knob 507, the lead screw nut 505 is installed on the trapezoidal lead screw 504, the supporting seat 501 is arranged between the two guide rails 506 and is, the lower end of the supporting seat 501 is provided with a guide boss 511, and the guide boss 511 is arranged in the guide groove 510 in a sliding manner; in order to change the position of the guide rail 506 mounted on the workbench 2, thereby expanding the support range of the support base 501 to the cylinder covers, i.e. enabling the support base 501 to adapt to the cylinder covers with different specifications and sizes, the guide rail 506 is provided with a waist-shaped hole, the waist-shaped hole is used for being correspondingly matched and connected with the connecting hole, a bolt and a nut are arranged between the waist-shaped hole and the connecting hole, thereby mounting the guide rail 506 on the workbench 2, changing the connecting hole for connecting the guide rail 506, and further changing the position of the guide rail 506 on the workbench 2.
As shown in fig. 9, in order to ensure the stability of the rotation of the workbench 2, the cylinder head welding tool further includes a passive rotation unit 6, the passive rotation unit 6 is disposed on the other side of the bracket 102 relative to the active rotation unit 1, and the bracket 102 is rotatably connected to the passive rotation unit 6; the driven rotating unit 6 comprises a second support 601, a toothless rotary bearing 602 and a second flange connecting seat 603, wherein an inner ring of the toothless rotary bearing 602 is mounted on the second support 601, a second flange connecting seat 603 is mounted on an outer ring of the toothless rotary bearing 602, and the bracket 102 is connected with the second flange connecting seat 603.
The above-mentioned connected mode, the connected mode of setting, installation can select suitable connected mode among the prior art that has existed, like welding, riveting, threaded connection, bonding, pin joint, key-type connection, elastic deformation connect, buckle connection, interference connection, injection moulding's mode realization structural linking to each other, in the actual production, should realize connecting the purpose, guarantee under the prerequisite of connection effect, according to production condition, select the connected mode that the cost is lower, production efficiency is high.
The utility model discloses a concrete working process and principle:
according to the outer diameter of the cylinder cover, the knob 507 is rotated, the trapezoidal lead screw 504 rotates, so that the lead screw nut 505 moves along the axis of the trapezoidal lead screw 504 and drives the supporting seat 501 to move to a specified position, the cylinder cover is placed above the supporting seat 501, because the upper end surfaces of the supporting seats 501 are all the inclined surfaces 503 inclined towards the clamping jaw 402, the inclined surfaces 503 form a V-shaped groove structure, the cylinder cover can be stably placed at the upper end of the inclined surfaces 503, meanwhile, the clamping jaw 402 is placed in a through hole formed in the cylinder cover along the axis, the clamping jaw 402 is driven to move towards the outer side through a finger cylinder, the lower end surface of the rod III 405 presses the end surface of the cylinder cover, the cylinder cover is stably clamped in the cylinder cover welding tool through the matching of the clamping jaw 402 and the inclined surfaces 503, then the workbench rotating unit 1 and the workbench rotating unit 3 drive the workbench 2 to, thereby the convenient welding to the cylinder cap to the degree of automation of high welding cylinder cap.
In the specification of the present invention, a large number of specific details are explained. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims (8)

1. A cylinder cover welding tool is characterized by comprising an active rotating unit, a workbench rotating unit, a supporting unit and a centering unit, wherein the workbench rotating unit is installed on the active rotating unit, the workbench is installed on the workbench rotating unit, and the supporting unit and the centering unit are installed on the workbench;
the active rotating unit comprises a rotating driving mechanism and a bracket, the bracket is arranged on the rotating driving mechanism, the rotating driving mechanism is used for driving the bracket to rotate around a horizontal axis, the workbench rotating unit is arranged on the bracket, and the workbench rotating unit is used for driving the workbench to rotate; the centering unit comprises a clamping jaw driving mechanism and a clamping jaw, the clamping jaw driving mechanism is installed in the middle of the workbench, the clamping jaw is installed on the clamping jaw driving mechanism, and the clamping jaw driving mechanism is used for driving the clamping jaw to be clamped in a through hole formed in the cylinder cover along the axis; the supporting unit comprises a supporting seat and a supporting seat driving mechanism, the supporting seat driving mechanism is provided with a plurality of supporting seats and surrounds the clamping jaw, the supporting seat driving mechanism is installed on the workbench, the supporting seat driving mechanism is provided with a first movable end along the linear motion, the supporting seat is installed at the first movable end, the upper end face of the supporting seat faces the inclined plane of the clamping jaw, and the supporting seat driving mechanism is used for driving the supporting seat to face or keep away from the clamping jaw.
2. The cylinder cap welding tooling of claim 1, wherein the clamping jaw driving mechanism is a finger cylinder.
3. The cylinder cover welding tool according to claim 2, wherein the supporting seat driving mechanism comprises a trapezoidal lead screw, a lead screw nut, a supporting seat and a guide rail, the guide rail is mounted on the workbench, the supporting seat is mounted on the guide rail, the trapezoidal lead screw is rotatably connected to the supporting seat, the lead screw nut is mounted on the trapezoidal lead screw, the supporting seat is mounted on the lead screw nut, the guide rail is provided with a guide groove parallel to the axial direction of the trapezoidal lead screw, the lower end of the supporting seat is provided with a guide boss, and the guide boss is slidably arranged in the guide groove.
4. The cylinder cover welding tool according to claim 3, wherein the rotary driving mechanism comprises a first support, a first motor, a transmission mechanism and a first flange connecting seat, the transmission mechanism is mounted on the first support, the first motor and the first flange connecting seat are mounted on the transmission mechanism, and the support is connected to the first flange connecting seat.
5. The cylinder cover welding tool according to claim 4, wherein the workbench rotating unit comprises a second motor, the second motor is mounted on the support, and the workbench is mounted on an output shaft of the second motor.
6. The cylinder cover welding tool according to any one of claims 3 to 5, further comprising a passive rotating unit, wherein the passive rotating unit is arranged on the other side of the support relative to the active rotating unit, and the support is rotatably connected with the passive rotating unit.
7. The cylinder cover welding tool according to claim 6, wherein the passive rotating unit comprises a second support seat and a second flange connecting seat, the second flange connecting seat is rotatably mounted on the second support seat, and the support is connected with the second flange connecting seat.
8. The cylinder cover welding tool according to claim 7, wherein a plurality of connecting holes are formed in the surface of the workbench, a waist-shaped hole is formed in the guide rail, and the waist-shaped hole is used for being connected with the connecting holes in a matched mode.
CN201922449863.8U 2019-12-30 2019-12-30 Cylinder cap welding frock Active CN211708517U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201922449863.8U CN211708517U (en) 2019-12-30 2019-12-30 Cylinder cap welding frock

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922449863.8U CN211708517U (en) 2019-12-30 2019-12-30 Cylinder cap welding frock

Publications (1)

Publication Number Publication Date
CN211708517U true CN211708517U (en) 2020-10-20

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CN201922449863.8U Active CN211708517U (en) 2019-12-30 2019-12-30 Cylinder cap welding frock

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112372347A (en) * 2020-11-02 2021-02-19 重庆红亿机械有限公司 Bottom hole machining tool for cylinder cover

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112372347A (en) * 2020-11-02 2021-02-19 重庆红亿机械有限公司 Bottom hole machining tool for cylinder cover

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