CN214814946U

CN214814946U - Double-station engine connecting rod fixing clamp

Info

Publication number: CN214814946U
Application number: CN202121093165.XU
Authority: CN
Inventors: 欧小冬; 徐燕华
Original assignee: Jiaxing Haofeng Machinery Equipment Manufacturing Co ltd
Current assignee: Jiaxing Haofeng Machinery Equipment Manufacturing Co ltd
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2021-11-23
Anticipated expiration: 2031-05-20

Abstract

The utility model relates to a duplex position engine connecting rod mounting fixture. It has solved the not good problem of connecting rod anchor clamps result of use among the prior art. It is including being the processing bottom plate that the symmetry set up, processing bottom plate one end is equipped with and is vertical setting and is used for carrying out the rhombus positioning mechanism who fixes a position engine connecting rod one end, the processing bottom plate other end is equipped with the up end and is located same horizontal plane with rhombus positioning mechanism up end and is used for the cover positioning mechanism that rises that advances the engine connecting rod other end and fix a position, the cover positioning mechanism upper end that rises is equipped with and is located engine connecting rod tip circumference inboard and along the cover positioning mechanism axial that rises and push down the subassembly, the cover that rises pushes down the subassembly bottom and passes through the lifting drive mechanism that coupling assembling is located the processing bottom plate downside, and the cover that rises pushes down the subassembly middle part and is equipped with the cover resetting means that rises. The utility model has the advantages that: convenient to use, location effect is good and machining efficiency has been improved.

Description

Double-station engine connecting rod fixing clamp

Technical Field

The utility model relates to a mechanical equipment technical field, concretely relates to duplex position engine connecting rod mounting fixture.

Background

The connecting rod is one of the most important transmission parts in the diesel engine and is a component for connecting the piston and the crankshaft to move. The connecting rod is mainly manufactured and molded by casting and machining, a plurality of machining processes are required to be carried out on a casting blank in the machining process, wherein the fixing of the connecting rod is the most critical process, the connecting rod is usually fixed and clamped by installing an expansion sleeve in a clamp in the prior technical scheme, but the existing expansion sleeve clamps are all provided with an expansion groove at one end of the expansion sleeve, when the expansion sleeve expands and clamps a workpiece, only one end of the expansion sleeve expands, so that the expansion sleeve expands and opens unevenly at two ends of the expansion sleeve, the workpiece is clamped on the clamp unevenly, the reliability of the clamp is influenced, the machining precision of the part is influenced, and the service life of the expansion sleeve is also shorter due to the long-term single-end stress of the expansion sleeve; in addition, current cover anchor clamps that rise are difficult to automatic re-setting after the work piece processing and are carried out next time and compress tightly, and only can fix connecting rod one end, and the result of use is not good.

In order to solve the defects of the prior art, people have long searched for and put forward various solutions. For example, the chinese patent document discloses an expanding sleeve clamp [ CN202021228758.8], which comprises a base, a taper body, a pull rod, an expanding sleeve and a pull shaft. The tapering body is installed on the base, and tapering body lower extreme is provided with first conical surface, and the pull rod top is provided with the second conical surface, and the tapering body outside is located to the cover that rises, rises cover upper end and second conical surface cooperation butt, and the cover lower extreme that rises cooperates the butt with first conical surface, and the cover upper end and the lower extreme interval that rise are crisscross to be provided with a plurality of expansion tanks. The pull rod is driven to move up and down through the pull shaft, so that the expansion sleeve is clamped or loosened, conical surfaces abut against the two ends of the expansion sleeve when the expansion sleeve is clamped, expansion grooves are formed in the upper end and the lower end of the expansion sleeve, the two ends of the expansion sleeve can synchronously expand, a part sleeved on the outer side of the expansion sleeve is clamped from the upper end and the lower end, the clamping force applied to the workpiece is more uniform, the workpiece is mounted on the expansion sleeve more stably, and the machining precision of the part is not easily influenced.

The problem that clamping force of an expansion sleeve clamp in the prior art is uneven and machining precision of a workpiece is affected is solved to a certain extent by the scheme, but a plurality of defects still exist in the scheme, such as: the expansion sleeve clamp is difficult to automatically reset after the workpiece is machined, the expansion sleeve clamp is pressed for the next time, only one end of the connecting rod can be fixed, and the using effect is poor.

Disclosure of Invention

The utility model aims at the above problem, a reasonable in design, excellent in use effect's duplex position engine connecting rod mounting fixture is provided.

In order to achieve the above purpose, the utility model adopts the following technical proposal: this duplex position engine connecting rod mounting fixture, including being the processing bottom plate that the symmetry set up, processing bottom plate one end is equipped with and is vertical setting and is used for carrying out the rhombus positioning mechanism who fixes a position engine connecting rod one end, the processing bottom plate other end is equipped with the cover positioning mechanism that rises that the up end and rhombus positioning mechanism up end lie in same horizontal plane and be used for fixing a position the engine connecting rod other end, the cover positioning mechanism upper end that rises is equipped with and lies in the inboard cover that rises that just sets up along cover positioning mechanism axial that rises of engine connecting rod tip circumference, the cover that rises pushes down the lifting drive mechanism that the subassembly bottom lies in processing bottom plate downside through coupling assembling connection, and the cover that rises pushes down the subassembly middle part and is equipped with the cover resetting means that rises. The two ends of the engine connecting rod are fixed by respectively arranging the diamond positioning mechanism and the expansion sleeve positioning mechanism at the two ends of the processing bottom plate, the positioning effect is good, the expansion sleeve resetting device is arranged in the middle of the expansion sleeve pushing assembly, the lifting driving mechanism pulls the expansion sleeve pushing assembly to push down so that the expansion sleeve positioning mechanism can position and compress one end of the engine connecting rod, after the engine connecting rod is processed, the lifting driving mechanism pulls the expansion sleeve pushing assembly to ascend, the positioning expansion sleeve can be quickly reset by utilizing the expansion sleeve resetting device, the engine connecting rod can be conveniently positioned and compressed next time, and the using effect is good.

In the double-station engine connecting rod fixing clamp, the expansion sleeve positioning mechanism comprises an expansion sleeve positioning cylinder, the lower end of the expansion sleeve positioning cylinder is fixedly arranged on the machining bottom plate through a mounting seat, the upper end of the expansion sleeve positioning cylinder is open, a connecting rod placing platform is formed on the upper end face of the expansion sleeve positioning cylinder, and a positioning expansion sleeve is arranged on the circumferential inner side of the expansion sleeve positioning cylinder. One end of the engine connecting rod can be effectively positioned through compression and expansion of the positioning expansion sleeve.

In the double-station engine connecting rod fixing clamp, the inner side of the circumferential direction of the positioning expansion sleeve is provided with a penetrating hole for inserting the lower end of the expansion sleeve pressing component, the upper end of the positioning expansion sleeve and the expansion sleeve pressing component are abutted against each other, and the lower end of the positioning expansion sleeve is arranged on a processing bottom plate.

In the double-station engine connecting rod fixing clamp, the expansion sleeve pressing component comprises a pressing disc body, the pressing disc body is arranged on the circumferential inner side of one end of the engine connecting rod, an elastic telescopic rod component used for being connected with the engine connecting rod is transversely arranged on the pressing disc body, and a pressing sleeve which is located in the penetrating hole and is provided with a connecting channel on the circumferential inner side is fixedly connected to the lower side of the pressing disc body. The jacking disc body can not only position the engine connecting rod, but also drive the jacking sleeve to press downwards.

In foretell duplex position engine connecting rod mounting fixture, roof pressure disk body circumference outer wall and the inboard contact of engine connecting rod one end circumference each other, roof pressure sleeve upper end has the annular top splenium that links to each other with the roof pressure disk body, and the setting is supported by the location cover expansion upper end and is pressed at annular top splenium downside, and roof pressure disk body downside is equipped with the location cylinder of joint in interface channel, thereby utilizes annular top splenium can compress tightly the location cover expansion to engine connecting rod one end circumference inboard.

In foretell duplex position engine connecting rod mounting fixture, coupling assembling is including setting up the connecting screw at the interface channel lower extreme, and is equipped with in the interface channel and is used for carrying on spacing bellying to the connecting screw, and the lift actuating mechanism output has screw rod connecting portion, and screw rod connecting portion set up in the interface channel and link to each other with the connecting screw lower extreme, and the screw rod connecting portion upper end supports to set up with spacing bellying downside each other. The arrangement of the connecting assembly enables the jacking sleeve to be capable of lifting rapidly, and the linkage is good.

In the double-station engine connecting rod fixing clamp, the expansion sleeve resetting device comprises strip-shaped connecting holes formed in the jacking sleeve and the positioning expansion sleeve, and the jacking sleeve and the positioning expansion sleeve are fixedly connected through connecting pins arranged in the strip-shaped connecting holes. The expansion sleeve resetting device enables the positioning expansion sleeve to be synchronously reset along with the positioning sleeve after being pressed.

In the double-station engine connecting rod fixing clamp, the elastic telescopic rod assembly comprises an elastic connecting sleeve, connecting rod bodies capable of axially stretching along the elastic connecting sleeve are arranged at two ends of the elastic connecting sleeve, and flexible cushion blocks positioned on the circumferential inner side of one end of the engine connecting rod are arranged at the end part of the connecting rod body. The elastic telescopic rod component is mainly used for preliminarily positioning one end of the engine connecting rod.

In the above double-station engine connecting rod fixing clamp, the rhombic positioning mechanism comprises a positioning cylinder seat arranged on the processing bottom plate, a rhombic positioning column is fixedly arranged on the circumferential inner side of the upper end of the positioning cylinder seat, and the upper end of the rhombic positioning column is exposed out of the circumferential inner side of the positioning cylinder seat and is fixedly connected with one end of the engine connecting rod. The rhombus positioning mechanism is used for positioning the other end of the engine connecting rod.

In the double-station engine connecting rod fixing clamp, the processing bottom plates are fixedly connected, and a processing gap is formed between the expansion sleeve positioning mechanisms on different processing bottom plates.

Compared with the prior art, the utility model has the advantages of: simple structure, reasonable in design fix engine connecting rod both ends through setting up rhombus positioning mechanism and the cover positioning mechanism that rises respectively at processing bottom plate both ends, and through set up the cover resetting means that rises at the cover push down subassembly middle part that rises, make the location rise the cover pressurized can follow the synchronous reset that carries on of positioning sleeve and be convenient for carry out next time location and compress tightly the engine connecting rod, excellent in use effect, and set up the duplex position on processing bottom plate, improved machining efficiency.

Drawings

Fig. 1 is a sectional view of the overall structure of the present invention;

fig. 2 is a plan view of the present invention.

In the figure, a bottom plate 1, an engine connecting rod 11, a lifting driving mechanism 12, a diamond positioning mechanism 2, a positioning cylinder seat 21, a diamond positioning column 22, an expansion sleeve positioning mechanism 3, an expansion sleeve positioning cylinder 31, a mounting seat 32, a connecting rod placing platform 33, a positioning expansion sleeve 34, a penetrating hole 35, an expansion sleeve pressing component 4, a pressing disc body 41, a pressing sleeve 42, a connecting channel 43, an annular pressing part 44, a positioning cylinder 45, a connecting component 5, a connecting screw 51, a limiting protruding part 52, a screw connecting part 53, an expansion sleeve resetting device 6, a strip-shaped connecting hole 61, a connecting pin 62, an elastic telescopic rod component 7, an elastic connecting sleeve 71, a connecting rod body 72 and a flexible cushion block 73 are processed.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-2, the double-station engine connecting rod fixing clamp comprises a processing bottom plate 1 which is symmetrically arranged, a rhombic positioning mechanism 2 which is vertically arranged and is used for positioning one end of an engine connecting rod 11 is arranged at one end of the processing bottom plate 1, an expansion sleeve positioning mechanism 3 which is arranged at the other end of the processing bottom plate 1, the upper end face of the rhombic positioning mechanism 2 and the upper end face of the expansion sleeve positioning mechanism are located on the same horizontal plane and are used for positioning the other end of the engine connecting rod 11, an expansion sleeve pressing component 4 which is located on the circumferential inner side of the end part of the engine connecting rod 11 and is axially arranged along the expansion sleeve positioning mechanism 3 is arranged at the upper end of the expansion sleeve positioning mechanism 3, the bottom of the expansion sleeve pressing component 4 is connected with a lifting driving mechanism 12 which is located on the lower side of the processing bottom plate 1 through a connecting component 5, and an expansion sleeve resetting device 6 is arranged in the middle of the expansion sleeve pressing component 4. The two ends of the connecting rod of the engine connecting rod 11 are effectively fixed by the diamond positioning mechanism 2 and the expansion sleeve positioning mechanism 3 which are respectively arranged at the two ends of the processing bottom plate 1, the positioning effect is good, the two processing bottom plates 1 which are connected with each other are arranged to form double stations, the processing efficiency is improved, and meanwhile, the expansion sleeve resetting device 6 is arranged to enable the positioning expansion sleeve 34 which is pushed down by the expansion sleeve pushing component 4 to reset quickly, so that the use effect is good.

Wherein, the sleeve positioning mechanism 3 that rises includes the sleeve location barrel 31 that rises, and the sleeve location barrel 31 lower extreme that rises passes through the mount pad 32 fixed the setting on the processing bottom plate 1, and rises and to be uncovered and the up end formation connecting rod place the platform 33 in the sleeve location barrel 31 upper end, and the sleeve location barrel 31 that rises is equipped with location cover 34 that rises to the inboard in the circumference. The positioning sleeve 34 is tapered, i.e., gradually increased in diameter from top to bottom.

Visibly, the circumferential inner side of the positioning expansion sleeve 34 is provided with a penetration hole 35 for inserting the lower end of the expansion sleeve pushing component 4, the upper end of the positioning expansion sleeve 34 is abutted against the expansion sleeve pushing component 4, and the lower end is arranged on the processing bottom plate 1.

Obviously, the expanding sleeve pressing assembly 4 comprises a pressing disc body 41, the pressing disc body 41 is arranged on the circumferential inner side of one end of the engine connecting rod 11, the elastic telescopic rod assembly 7 for connecting the engine connecting rod 11 is transversely arranged on the pressing disc body 41, and a pressing sleeve 42 which is positioned in the through hole 35 and is provided with a connecting channel 43 on the circumferential inner side is fixedly connected to the lower side of the pressing disc body 41. When the bottom of the pressing sleeve 42 is pulled down by the connecting component 5 and the bottom abuts against the processing bottom plate 1, the positioning expansion sleeve 34 is compressed and expanded by the pressure of the pressing disc body 41 to position and press one end of the engine connecting rod 11.

Furthermore, the circumferential outer wall of the jacking disk body 41 is contacted with the circumferential inner side of one end of the engine connecting rod 11, the upper end of the jacking sleeve 42 is provided with an annular jacking portion 44 connected with the jacking disk body 41, the upper end of the positioning expansion sleeve 34 is abutted against the lower side of the annular jacking portion 44, the lower side of the jacking disk body 41 is provided with a positioning column body 45 clamped in the connecting channel 43,

specifically, the connecting assembly 5 includes a connecting screw 51 disposed at the lower end of the connecting channel 43, a limiting protrusion 52 for limiting the connecting screw 51 is disposed in the connecting channel 43, the output end of the lifting driving mechanism 12 has a screw connecting portion 53, the screw connecting portion 53 is disposed in the connecting channel 43 and connected to the lower end of the connecting screw 51, and the upper end of the screw connecting portion 53 and the lower side of the limiting protrusion 52 are abutted to each other. The lifting driving mechanism 12 is a hydraulic oil cylinder, and when the jacking sleeve 42 is pressed down, the lifting driving mechanism 12 pulls the connecting screw rod 51 to descend, and the upper end of the connecting screw rod 51 is abutted against the limiting convex part 52, so that the jacking sleeve 42 is driven to be synchronously pressed down; when the pressing sleeve 42 is lifted and reset, the lifting driving mechanism 12 pushes the limiting convex part 52 so as to lift and reset the pressing sleeve 42.

Furthermore, the expansion sleeve resetting device 6 comprises a bar-shaped connecting hole 61 arranged on the jacking sleeve 42 and the positioning expansion sleeve 34, and the jacking sleeve 42 and the positioning expansion sleeve 34 are fixedly connected through a connecting pin 62 arranged in the bar-shaped connecting hole 61. In a normal state, the connecting pin 62 is located at the uppermost end of the bar-shaped connecting hole 61, when the pressing sleeve 42 is pressed down, the connecting pin 62 moves downward in the bar-shaped connecting hole 61, and when the pressing sleeve 42 rises, the connecting pin 62 is driven to pull the positioning expansion sleeve 34 to synchronously rise and reset.

More specifically, the elastic telescopic rod assembly 7 comprises an elastic connecting sleeve 71, two ends of the elastic connecting sleeve 71 are provided with connecting rod bodies 72 capable of axially extending and contracting along the elastic connecting sleeve 71, and the end parts of the connecting rod bodies 72 are provided with flexible cushion blocks 73 positioned at the circumferential inner side of one end of the engine connecting rod 11. The flexible pad 73 is mainly used to prevent the circumferential inner side friction damage of one end of the engine connecting rod 11.

In detail, the rhombic positioning mechanism 2 comprises a positioning cylinder seat 21 arranged on the processing bottom plate 1, a rhombic positioning column 22 is fixedly arranged on the circumferential inner side of the upper end of the positioning cylinder seat 21, and the upper end of the rhombic positioning column 22 is exposed out of the circumferential inner side of the positioning cylinder seat 21 and is fixedly connected with one end of the engine connecting rod 11.

Preferably, the processing bottom plates 1 are fixedly connected, and processing gaps 23 are formed between the expansion sleeve positioning mechanisms 3 on different processing bottom plates 1.

In summary, the principle of the present embodiment is: one end of an engine connecting rod 11 is placed into the upper end of a positioning cylinder seat 21 and is positioned through a diamond positioning column 22, the other end of the engine connecting rod 11 is placed on a connecting rod placing platform 33 and is primarily positioned through an elastic telescopic rod assembly 7, a lifting driving mechanism 12 pulls a connecting screw rod 51 to descend, and as the upper end of the connecting screw rod 51 is abutted against a limiting protruding portion 52, the jacking sleeve 42 is driven to synchronously press downwards, and an annular jacking portion 44 presses a positioning expansion sleeve 34 downwards, so that the circumferential inner side of one end of the engine connecting rod 11 is positioned and pressed; after the machining is finished, the lifting driving mechanism 12 pushes the limit boss 52 to lift and reset the jacking sleeve 42, and the positioning expansion sleeve 34 is synchronously reset through the action of the connecting pin 62.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although terms such as processing the bottom plate 1, the engine connecting rod 11, the lifting driving mechanism 12, the diamond-shaped positioning mechanism 2, the positioning cylinder seat 21, the diamond-shaped positioning column 22, the expansion sleeve positioning mechanism 3, the expansion sleeve positioning cylinder 31, the mounting seat 32, the connecting rod placing platform 33, the positioning expansion sleeve 34, the through hole 35, the expansion sleeve pressing component 4, the pressing disc body 41, the pressing sleeve 42, the connecting channel 43, the annular pressing part 44, the positioning cylinder 45, the connecting component 5, the connecting screw 51, the limiting protrusion 52, the screw connecting part 53, the expansion sleeve resetting device 6, the strip-shaped connecting hole 61, the connecting pin 62, the elastic telescopic rod component 7, the elastic connecting sleeve 71, the connecting rod body 72, the flexible cushion block 73 and the like are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The utility model provides a duplex position engine connecting rod mounting fixture, includes processing bottom plate (1) that is the symmetry and sets up, its characterized in that, processing bottom plate (1) one end be equipped with be vertical setting and be used for carrying out rhombus positioning mechanism (2) of fixing a position engine connecting rod (11) one end, processing bottom plate (1) other end be equipped with up end and rhombus positioning mechanism (2) up end be located same horizontal plane and be used for carrying out the cover positioning mechanism (3) that rises that fix a position the engine connecting rod (11) other end, cover positioning mechanism (3) upper end that rises be equipped with lie in engine connecting rod (11) tip circumference inboard and along the cover that rises that set positioning mechanism (3) axial set up push down subassembly (4), cover that rises push down subassembly (4) bottom through coupling assembling (5) connect the lift actuating mechanism (12) that lie in processing bottom plate (1) downside, and an expansion sleeve resetting device (6) is arranged in the middle of the expansion sleeve pressing component (4).

2. The double-station engine connecting rod fixing clamp according to claim 1, wherein the expansion sleeve positioning mechanism (3) comprises an expansion sleeve positioning cylinder (31), the lower end of the expansion sleeve positioning cylinder (31) is fixedly arranged on the machining bottom plate (1) through a mounting seat (32), the upper end of the expansion sleeve positioning cylinder (31) is open, a connecting rod placing platform (33) is formed on the upper end face of the expansion sleeve positioning cylinder, and a positioning expansion sleeve (34) is arranged on the circumferential inner side of the expansion sleeve positioning cylinder (31).

3. The double-station engine connecting rod fixing clamp as claimed in claim 2, wherein the circumferential inner side of the positioning expansion sleeve (34) is provided with a through hole (35) for inserting the lower end of the expansion sleeve pressing component (4), the upper end of the positioning expansion sleeve (34) is abutted against the expansion sleeve pressing component (4), and the lower end of the positioning expansion sleeve is arranged on the processing bottom plate (1).

4. The double-station engine connecting rod fixing clamp as claimed in claim 3, wherein the expansion sleeve pressing assembly (4) comprises a pressing disc body (41), the pressing disc body (41) is arranged on the circumferential inner side of one end of the engine connecting rod (11), an elastic telescopic rod assembly (7) used for connecting the engine connecting rod (11) is transversely arranged on the pressing disc body (41), and a pressing sleeve (42) which is positioned in the penetrating hole (35) and is provided with a connecting channel (43) on the circumferential inner side is fixedly connected to the lower side of the pressing disc body (41).

5. The double-station engine connecting rod fixing clamp as claimed in claim 4, wherein the circumferential outer wall of the jacking plate body (41) is in contact with the circumferential inner side of one end of the engine connecting rod (11), the upper end of the jacking sleeve (42) is provided with an annular jacking portion (44) connected with the jacking plate body (41), the upper end of the positioning expansion sleeve (34) is abutted against the lower side of the annular jacking portion (44), and the lower side of the jacking plate body (41) is provided with a positioning column (45) clamped in the connecting channel (43).

6. The double-station engine connecting rod fixing clamp according to claim 5, characterized in that the connecting assembly (5) comprises a connecting screw rod (51) arranged at the lower end of the connecting channel (43), a limiting protrusion (52) used for limiting the connecting screw rod (51) is arranged in the connecting channel (43), the output end of the lifting driving mechanism (12) is provided with a screw rod connecting part (53), the screw rod connecting part (53) is arranged in the connecting channel (43) and connected with the lower end of the connecting screw rod (51), and the upper end of the screw rod connecting part (53) is abutted against the lower side of the limiting protrusion (52).

7. The double-station engine connecting rod fixing clamp as claimed in claim 4, wherein the expansion sleeve resetting device (6) comprises a strip-shaped connecting hole (61) formed in the jacking sleeve (42) and the positioning expansion sleeve (34), and the jacking sleeve (42) and the positioning expansion sleeve (34) are fixedly connected through a connecting pin (62) arranged in the strip-shaped connecting hole (61).

8. The double-station engine connecting rod fixing clamp as claimed in claim 5, wherein the elastic expansion rod assembly (7) comprises an elastic connecting sleeve (71), connecting rod bodies (72) capable of expanding and contracting along the axial direction of the elastic connecting sleeve (71) are arranged at two ends of the elastic connecting sleeve (71), and a flexible cushion block (73) positioned on the circumferential inner side of one end of the engine connecting rod (11) is arranged at the end part of each connecting rod body (72).

9. The double-station engine connecting rod fixing clamp according to claim 1, wherein the rhombic positioning mechanism (2) comprises a positioning cylinder seat (21) arranged on the machining bottom plate (1), a rhombic positioning column (22) is fixedly arranged on the circumferential inner side of the upper end of the positioning cylinder seat (21), and the upper end of the rhombic positioning column (22) is exposed on the circumferential inner side of the positioning cylinder seat (21) and is fixedly connected with one end of the engine connecting rod (11).

10. The double-station engine connecting rod fixing clamp according to claim 9, characterized in that the machining bottom plates (1) are fixedly connected, and machining gaps are formed among the expansion sleeve positioning mechanisms (3) on different machining bottom plates (1).