An adjustable fixture for precision boring of connecting rods

Abstract

This invention discloses an adjustable fixture for precision boring of connecting rods, belonging to the field of connecting rod boring technology. It includes a rotary seat, with a clamping part rotatably connected to one side of the front of the rotary seat. A connecting rod is clamped and fixed on the clamping part. A counterweight is rotatably connected to the front of the rotary seat via a second rotating shaft. By setting a synchronization mechanism, this invention can drive the counterweight to rotate synchronously and in the same direction by 180° during the adjustment of the connecting rod's large and small end positions. This ensures that the center of gravity of the counterweight is symmetrically adjusted about the axis of the second rotating shaft, thus guaranteeing that after the connecting rod's large and small end positions are adjusted, the common center of gravity of the clamping part and the connecting rod, along with the center of gravity of the counterweight, are always symmetrically positioned about the axis of the rotary seat. This facilitates a uniform distribution of fixture mass, and the centrifugal forces generated during rotation cancel each other out in all directions, reducing vibration and thus improving the surface quality and dimensional accuracy of the boring of the connecting rod.

Description

Technical Field

[0001] This invention relates to the field of connecting rod boring technology, specifically an adjustable fixture for precision boring of connecting rods. Background Technology

[0002] The connecting rod is a part of a piston engine that connects the piston to the crankshaft, transmitting the force on the piston to the crankshaft and converting the reciprocating motion of the piston into the rotational motion of the crankshaft. The connecting rod consists of three parts: the part that connects to the piston pin is called the small end, the part that connects to the crankshaft is called the big end, and the part connecting the small end and the big end is called the connecting rod body. The circular holes on the small end and big end of the connecting rod require boring. There are two main methods for boring the connecting rod: workpiece rotation (without boring bar rotation) and workpiece stationary (with boring bar rotation).

[0003] The workpiece rotates (lathe / turning center principle), and the connecting rod to be machined is clamped on the rotary seat (rotation). The boring tool is fixed on the tool post (linear feed). The two holes are completed in one clamping, with excellent concentricity and continuous rotary cutting. The feed is stable, the machining efficiency is high, the cutting is continuous, the vibration is small, the surface quality of the connecting rod boring is high, and the requirements for tool complexity are low (a single-edged boring tool is sufficient). Typical application scenarios are suitable for the mass production of automotive engine connecting rods.

[0004] When boring and finishing connecting rods using a workpiece rotation method (without rotating the boring tool), a rotary fixture (consisting of a rotary seat and a clamping part) is required to stably clamp the connecting rod and drive it to rotate. This is then combined with a linear feed boring tool to complete the boring of the connecting rod's large and small ends. Currently, most rotary fixtures on the market, to facilitate machining of the connecting rod's large and small ends, have a function to adjust the connecting rod's position, allowing the large and small ends to be switched to be coaxial with the axis of the rotary seat for boring. This forces the clamping part and connecting rod to be eccentrically positioned on the rotary seat, causing the center of gravity of the rotary fixture to misalign with the rotation axis, generating centrifugal force and resulting in severe vibration of the rotary fixture. To minimize vibration during operation, a counterweight needs to be placed on the rotary seat, symmetrically distributed with the clamping part about the axis of the rotary seat.

[0005] However, most counterweights on existing rotary fixtures are fixedly installed and cannot be adaptively adjusted according to changes in the common center of gravity of the clamping part and the connecting rod. They cannot align the common center of gravity of the connecting rod, clamping part, and counterweight with the rotation axis of the rotary seat. In practical applications, when boring the small end of the connecting rod, the common center of gravity of the connecting rod and clamping part is located on the side of the fixture's rotation axis away from the rotation axis of the rotary seat; when boring the large end of the connecting rod, the common center of gravity of the connecting rod and clamping part is located on the rotation axis of the clamping part. The side closest to the rotating axis of the rotating seat; if the center of gravity of the counterweight cannot be adjusted according to the change of the common center of gravity of the clamping part and the connecting rod, it will lead to uneven mass distribution on the rotating fixture, resulting in poor balancing effect. When the rotating fixture drives the connecting rod to rotate at high speed, due to the imbalance of centrifugal force, the centrifugal forces generated in different parts cannot cancel each other out, resulting in periodically changing inertial force, which causes strong vibration of the fixture, affecting the quality and accuracy of the boring of the connecting rod's large and small ends. It has certain limitations and needs to be improved.

[0006] Therefore, it is necessary to provide an adjustable fixture for precision boring of connecting rods to solve the above-mentioned technical problems. Summary of the Invention

[0007] The purpose of this invention is to provide an adjustable fixture for precision boring of connecting rods. By designing an adjustable counterweight, the counterweight position is adjusted in real time according to the changes in the center of gravity of the connecting rod and the clamping part, ensuring that the common center of gravity of the counterweight, connecting rod and clamping part always coincides with the rotation axis of the rotary seat. This is beneficial to the uniform distribution of the mass of the rotary fixture, and the centrifugal force generated during rotation cancels each other out in all directions, reducing vibration and improving the surface quality and dimensional accuracy of the boring of the connecting rod, thereby solving the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an adjustable fixture for precision boring of connecting rods, comprising a rotary seat, a clamping part rotatably connected to one side of the front of the rotary seat, a connecting rod clamped and fixed on the clamping part, and a counterweight rotatably connected to the front of the rotary seat via a rotating shaft, the counterweight and the clamping part being symmetrically arranged about the axis of the rotary seat, and the total mass of the clamping part and the connecting rod being the same as the mass of the counterweight, and the common center of gravity of the clamping part and the connecting rod being symmetrically arranged about the axis of the rotary seat with respect to the center of gravity of the counterweight.

[0009] The clamping part and the counterweight are connected by a synchronization mechanism;

[0010] When the positions of the large and small ends of the connecting rod are changed, the counterweight is adjusted synchronously through the synchronization mechanism, so that the common center of gravity of the clamping part and the connecting rod and the center of gravity of the counterweight are always symmetrically set about the axis of the rotating seat.

[0011] By rotating the clamping part onto the rotary seat, after the boring of one end of the connecting rod on the clamping part is completed, the position of the connecting rod can be adjusted by rotating the clamping part to change the position of the large and small ends of the connecting rod. This allows for the machining of both holes of the large and small ends of the connecting rod in one clamping, eliminating the need for repeated clamping and improving the boring effect of the connecting rod. Furthermore, the use of the limiting mechanism and the limiting sleeve can limit and fix the adjusted fixture seat, improving the stability of the clamping part and ensuring the stability of the connecting rod during machining, thus avoiding the impact of connecting rod wobbling and displacement on the boring accuracy.

[0012] As a further description of the above technical solution: the clamping part includes a clamping seat and two limiting sleeves. The clamping seat is rotatably mounted on one side of the front of the rotating seat via a rotating shaft. A limiting seat is fixedly connected to the front of the clamping seat. A positioning groove adapted to the size of the connecting rod is opened on the front of the limiting seat. A clamping frame is hinged to the front of the limiting seat. A locking bolt is movably inserted at the end of the clamping frame away from the end hinged to the limiting seat. A bolt hole adapted to the locking bolt is opened on the front of the limiting seat at the position corresponding to the locking bolt. The clamping frame is locked and fixed to the limiting seat by the cooperation of the locking bolt and the bolt hole.

[0013] The clamp seat is provided with a limiting mechanism on the front side. The limiting mechanism and the limiting sleeve are used together to limit and fix the clamp seat.

[0014] As a further description of the above technical solution: both limiting sleeves are fixedly embedded in the front of the rotating seat, the two limiting sleeves are symmetrically distributed around the axis of the rotating shaft, and one of the limiting sleeves is positioned corresponding to the limiting mechanism.

[0015] As a further description of the above technical solution: the limiting mechanism includes a fixed block fixedly installed on the front of the fixture seat, a rectangular rod movably mounted through the fixed block, a pull rod and a circular plate fixedly connected to the front and rear ends of the rectangular rod respectively, a limiting pin fixedly connected to the rear side of the circular plate, and a compression spring fixedly connected between the circular plate and the fixed block, with the compression spring movably sleeved on the outside of the rectangular rod; in actual application, the worker pulls the pull rod forward, causing the rectangular rod, the circular plate and the limiting pin to move synchronously, and the circular plate moves towards the side closer to the fixed block. The compression spring is compressed and stored, and the lever is continuously pulled until the limit pin exits the limit sleeve, releasing the limit fixation of the fixture seat. Then, the fixture seat is manually rotated 180° clockwise, causing the limit mechanism to rotate synchronously. That is, the limit mechanism rotates to the front of the other limit sleeve. Through the elastic force of the compression spring, the circular plate is pushed to the side away from the fixed block, thereby causing the limit pin to insert into the corresponding limit sleeve, and the fixture seat is fixed again, improving the stability of the fixture seat.

[0016] As a further description of the above technical solution: the limiting pin is movably inserted inside one of the limiting sleeves.

[0017] As a further description of the above technical solution: the synchronization mechanism includes a protective shell, which is fixedly installed on the front of the rotating seat. Two rotating shafts are fixedly connected between the back of the inner wall of the protective shell and the rotating seat. Gear 1 is fixedly sleeved on the outer surface of each of the two rotating shafts. Gear 2 is meshed on the outer surface of each of the two gear 1s, and the same rack meshes between the outer surfaces of the two gear 1s. The rack is slidably installed on the inner wall of the protective shell through a sliding assembly.

[0018] In practical applications, when the rotating shaft on the clamping part rotates, it drives the gear two fixedly connected to it to rotate, which in turn drives the gear one meshing with the gear two to rotate. Then, the kinetic energy is transmitted to another gear one through the rack, which then drives another gear two to rotate, and drives the rotating shaft two to rotate synchronously. This allows the counterweight to be adjusted synchronously through the synchronization mechanism when the position of the connecting rod clamped and fixed on the clamping part is changed. This ensures that the common center of gravity of the clamping part and the connecting rod and the center of gravity of the counterweight are always symmetrically set around the axis of the rotating seat, which is beneficial to the uniform distribution of the clamp's mass. The centrifugal force generated during rotation cancels each other out in all directions, reducing vibration and thus improving the surface quality and dimensional accuracy of the connecting rod boring.

[0019] As a further description of the above technical solution: the sliding component includes a slide rail, which is fixedly installed on the top of the inner wall of the protective shell. Multiple sliders are slidably connected inside the slide rail. Through the cooperation of the slide rail and the sliders, the rack can be limited to ensure the stability of the rack during movement. Then, one of the gears transmits kinetic energy to the rack. When driving the rack to move, it is beneficial for the rack to accurately transmit kinetic energy to the other gear, so that the two gears rotate synchronously. This ensures that when the clamping part rotates, the counterweight can be driven to rotate synchronously through the synchronization mechanism.

[0020] As a further description of the above technical solution: all of the sliders are fixedly connected to the rack.

[0021] As a further description of the above technical solution: one of the gears is fixedly sleeved on the outer surface of the rotating shaft, and the other gear is fixedly sleeved on the outer surface of the rotating shaft.

[0022] As a further description of the above technical solution: A rectangular block is fixedly installed on the front of the rotary seat. The center of gravity of the rectangular block and the center of gravity of the synchronization mechanism are symmetrically distributed about the axis of the rotary seat. The mass of the rectangular block is the same as the weight of the synchronization mechanism. The rectangular block is used to counterweight the synchronization mechanism, which is conducive to the uniform distribution of the mass of other structures on the rotary seat, and thus facilitates the stable operation of the subsequent high-speed rotation of the fixture.

[0023] The present invention has the following beneficial effects:

[0024] 1. When the positions of the large and small ends of the connecting rod are changed, the common center of gravity of the connecting rod and the clamping part will be symmetrically changed about the axis of the first rotating shaft. Due to the setting of the synchronization mechanism, during the process of changing the position of the large and small ends of the connecting rod, the counterweight can be driven to rotate synchronously and in the same direction by 180°, so that the center of gravity of the counterweight is symmetrically changed about the axis of the second rotating shaft. This ensures that after the position of the large and small ends of the connecting rod is changed, the common center of gravity of the clamping part and the connecting rod and the center of gravity of the counterweight are always symmetrically set about the axis of the rotating seat. This is beneficial to the uniform distribution of the fixture mass. The centrifugal force generated during rotation cancels each other in all directions, reducing vibration, thereby improving the surface quality and dimensional accuracy of the connecting rod boring.

[0025] 2. The rotation of the first rotating shaft on the clamping part of the present invention drives the rotation of the second gear fixedly connected to it, which in turn drives the first gear meshing with the second gear to rotate. Then, the kinetic energy is transmitted to another first gear through the rack, which then drives the other second gear to rotate and drives the second rotating shaft to rotate synchronously. This enables the counterweight to be adjusted synchronously through the synchronization mechanism when the position of the large and small ends of the connecting rod clamped and fixed on the clamping part is changed, so that the common center of gravity of the clamping part and the connecting rod and the center of gravity of the counterweight are always symmetrically arranged about the axis of the rotating seat.

[0026] 3. This invention rotatably mounts the clamping part on the rotating seat, so that after the boring of one end of the connecting rod on the clamping part is completed, the position of the connecting rod can be adjusted by rotating the clamping part to change the position of the large and small ends of the connecting rod. This allows for the completion of the machining of both holes of the large and small ends of the connecting rod in one clamping, eliminating the need for repeated clamping and improving the boring effect of the connecting rod. Furthermore, the use of the limiting mechanism and the limiting sleeve can limit and fix the adjusted fixture seat, improving the stability of the clamping part and ensuring the stability of the connecting rod during machining, thus avoiding the impact of connecting rod wobbling and displacement on the boring accuracy. Attached Figure Description

[0027] Figure 1 This is a schematic diagram showing the machining state of the small end of the connecting rod using an adjustable fixture for precision boring of connecting rods, as proposed in this invention.

[0028] Figure 2 This is a schematic diagram showing the machining state of the big end of the connecting rod using an adjustable fixture for precision boring of connecting rods, as proposed in this invention.

[0029] Figure 3 This is a schematic diagram of the clamping frame locking state of an adjustable fixture for precision machining of connecting rod boring proposed in this invention;

[0030] Figure 4This is a schematic diagram of the clamping frame in the open state of an adjustable fixture for precision machining of connecting rod boring, as proposed in this invention.

[0031] Figure 5 This is a three-dimensional schematic diagram of the rotating seat and protective shell of an adjustable fixture for precision machining of connecting rod boring, as proposed in this invention.

[0032] Figure 6 This is a three-dimensional schematic diagram of the internal structure of the protective shell of an adjustable fixture for precision machining of connecting rod boring, as proposed in this invention.

[0033] Figure 7 This is a three-dimensional schematic diagram of the rack and rack-first structure of an adjustable fixture for precision machining of connecting rod boring, as proposed in this invention.

[0034] Figure 8 This is a three-dimensional schematic diagram of the sliding component and rack of an adjustable fixture for precision machining of connecting rod boring, as proposed in this invention.

[0035] Figure 9 This is a three-dimensional schematic diagram of the limiting mechanism and limiting sleeve of an adjustable fixture for precision machining of connecting rod boring, as proposed in this invention.

[0036] In the diagram: 1. Rotary seat; 2. Clamping part; 201. Clamping seat; 202. Limiting sleeve; 203. Rotating shaft one; 204. Limiting seat; 205. Clamping frame; 206. Locking bolt; 207. Bolt hole; 208. Limiting mechanism; 2081. Fixing block; 2082. Rectangular rod; 2083. Pull rod; 2084. Circular plate; 2085. Limiting pin; 2086. Compression spring; 209. Positioning groove; 3. Rotating shaft two; 4. Counterweight block; 5. Synchronization mechanism; 501. Protective shell; 502. Rotating shaft three; 503. Gear one; 504. Gear two; 505. Rack; 506. Sliding assembly; 5061. Slide rail; 5062. Slider; 6. Rectangular block. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] As attached Figure 1 To be continued Figure 9 As shown:

[0039] Example 1: The present invention provides an adjustable fixture for precision machining of connecting rod boring, including a rotary seat 1, a clamping part 2 rotatably connected to one side of the front of the rotary seat 1, a connecting rod clamped and fixed on the clamping part 2, and a counterweight 4 rotatably connected to the front of the rotary seat 1 through a rotating shaft 3. The counterweight 4 and the clamping part 2 are symmetrically arranged about the axis of the rotary seat 1, and the total mass of the clamping part 2 and the connecting rod is the same as the mass of the counterweight 4. The common center of gravity of the clamping part 2 and the connecting rod is symmetrically arranged about the axis of the rotary seat 1 with respect to the center of gravity of the counterweight 4.

[0040] The clamping part 2 and the counterweight 4 are connected by a synchronization mechanism 5;

[0041] In practical applications, when the positions of the large and small ends of the connecting rod are changed, the common center of gravity of the connecting rod and the clamping part 2 will be symmetrically changed about the axis of the rotating shaft 203. Due to the setting of the synchronization mechanism 5, during the process of changing the position of the large and small ends of the connecting rod, the counterweight 4 can be driven to rotate 180° synchronously in the same direction, so that the center of gravity of the counterweight 4 is symmetrically changed about the axis of the rotating shaft 3. This ensures that after the position of the large and small ends of the connecting rod is changed, the common center of gravity of the clamping part 2 and the connecting rod and the center of gravity of the counterweight 4 are always symmetrically set about the axis of the rotating seat 1. This is beneficial to the uniform distribution of the mass of the clamping part 2. The centrifugal force generated during rotation cancels each other in all directions, reducing vibration, thereby improving the surface quality and dimensional accuracy of the connecting rod boring.

[0042] By rotating the clamping part 2 onto the rotating base 1, after the boring of one end of the connecting rod on the clamping part 2 is completed, the position of the connecting rod can be adjusted by rotating the clamping part 2 to change the position of the large and small ends of the connecting rod. This allows for the completion of the machining of both holes of the large and small ends of the connecting rod in one clamping, eliminating the need for repeated clamping and improving the boring effect of the connecting rod. Furthermore, the cooperation of the limiting mechanism 208 and the limiting sleeve 202 can limit and fix the adjusted fixture base 201, improving the stability of the clamping part 2 and ensuring the stability of the connecting rod during the machining process, thus avoiding the impact of connecting rod wobbling and displacement on the boring accuracy.

[0043] The clamping part 2 includes a clamping base 201 and two limiting sleeves 202. The clamping base 201 is rotatably mounted on one side of the front of the rotating base 1 via a rotating shaft 203. A limiting seat 204 is fixedly connected to the front of the clamping base 201. A positioning groove 209 adapted to the size of the connecting rod is opened on the front of the limiting seat 204, and a clamping frame 205 is hinged to the front of the limiting seat 204. A locking bolt 206 is movably inserted into the end of the clamping frame 205 away from the end hinged to the limiting seat 204. The front of the limiting seat 204 and the position corresponding to the locking bolt 206 are provided with bolt holes 207 that are adapted to the locking bolt 206. The clamping frame 205 is locked and fixed to the limiting seat 204 through the cooperation of the locking bolt 206 and the bolt holes 207. The clamping part 2 is used to stably clamp and fix the connecting rod to be processed, so as to avoid the connecting rod from loosening and shifting its position when the subsequent fixture drives the connecting rod to rotate at high speed for boring processing, which would affect the progress of boring processing.

[0044] A limiting mechanism 208 is provided on the front of the clamp base 201. The limiting mechanism 208 and the limiting sleeve 202 are used together to limit and fix the clamp base 201.

[0045] Both limiting sleeves 202 are fixedly embedded in the front of the rotating seat 1. The two limiting sleeves 202 are symmetrically distributed around the axis of the rotating shaft 203, and one of the limiting sleeves 202 is positioned corresponding to the limiting mechanism 208.

[0046] The limiting mechanism 208 includes a fixing block 2081 fixedly installed on the front of the clamp seat 201. A rectangular rod 2082 is movably installed through the fixing block 2081. A pull rod 2083 and a circular plate 2084 are fixedly connected to the front and rear ends of the rectangular rod 2082, respectively. A limiting pin 2085 is fixedly connected to the rear side of the circular plate 2084. A compression spring 2086 is fixedly connected between the circular plate 2084 and the fixing block 2081. The compression spring 2086 is movably sleeved on the outside of the rectangular rod 2082. The limiting pin 2085 is movably inserted into the inside of one of the limiting sleeves 202.

[0047] In practical application, the worker pulls the lever 2083 forward, causing the rectangular rod 2082, the circular plate 2084, and the limiting pin 2085 to move synchronously. The circular plate 2084 moves closer to the fixed block 2081, compressing the compression spring 2086 and storing energy. The worker continues to pull the lever 2083 until the limiting pin 2085 exits the limiting sleeve 202, releasing the limiting fixation of the clamp seat 201. Then, the worker manually rotates the clamp seat 201 180° clockwise, causing the limiting mechanism 208 to rotate synchronously. That is, the limiting mechanism 208 rotates to the front of another limiting sleeve 202. Through the elastic force of the compression spring 2086, the circular plate 2084 is pushed to the side away from the fixed block 2081, thereby causing the limiting pin 2085 to insert into the corresponding limiting sleeve 202, thus limiting and fixing the clamp seat 201 again and improving the stability of the clamp seat 201.

[0048] Working principle: When the connecting rod needs to be bored for precision machining, the operator first loosens the locking bolt 206 with a bolt tightening tool, so that the locking bolt 206 is disconnected from the bolt hole 207. At this time, the clamping frame 205 can be flipped open to allow the operator to place the connecting rod to be machined into the positioning groove 209. Then, the clamping frame 205 is flipped to fasten to the outside of the connecting rod to be machined. The locking bolt 206 is tightened with a bolt tightening tool to make it threaded into the bolt hole 207, thereby locking the clamping frame 205 and the fixture seat 201. At this time, the clamping frame 205 plays a role in clamping and fixing the connecting rod to be machined in the positioning groove 209, ensuring that the connecting rod to be machined is stably clamped and fixed on the clamping part 2.

[0049] Then, the rotating seat 1 is driven to rotate at high speed by an external drive unit (such as a drive motor). At the same time, the large end or small end of the connecting rod is bored by linear feed through an external boring tool.

[0050] After the boring of one end of the connecting rod is completed, the worker first shuts off the external drive component, causing the rotating seat 1 to stop rotating. Then, the worker pulls the pull rod 2083 forward, causing the rectangular rod 2082, the circular plate 2084, and the limiting pin 2085 to move synchronously. The circular plate 2084 moves closer to the fixed block 2081, compressing the compression spring 2086 and storing energy. The pull rod 2083 is continuously pulled until the limiting pin 2085 exits the limiting sleeve 202, releasing the clamp. After the seat 201 is fixed in place, the clamp seat 201 is manually rotated 180° clockwise, which drives the limiting mechanism 208 to rotate synchronously. That is, the limiting mechanism 208 rotates to the front of another limiting sleeve 202. Through the elastic force of the compression spring 2086, the circular plate 2084 is pushed to the side away from the fixed block 2081, which in turn drives the limiting pin 2085 to be inserted into the corresponding limiting sleeve 202, thus fixing the clamp seat 201 again and improving the stability of the clamp seat 201.

[0051] Furthermore, during the 180° clockwise rotation of the fixture base 201, the position of the connecting rod to be processed, which is clamped and fixed on the clamping part 2, can be changed.

[0052] When the large and small ends of the connecting rod are repositioned, the common center of gravity of the connecting rod and the clamping part 2 will be symmetrically changed about the axis of the rotating shaft 203. Due to the setting of the synchronization mechanism 5, during the repositioning of the large and small ends of the connecting rod, the counterweight 4 can be driven to rotate 180° synchronously in the same direction, so that the center of gravity of the counterweight 4 is symmetrically changed about the axis of the rotating shaft 3. This ensures that after the repositioning of the large and small ends of the connecting rod, the common center of gravity of the clamping part 2 and the connecting rod and the center of gravity of the counterweight 4 are always symmetrically set about the axis of the rotating seat 1. This is beneficial to the uniform distribution of the mass of the clamping part 2. The centrifugal force generated during rotation cancels each other in all directions, reducing vibration, thereby improving the surface quality and dimensional accuracy of the connecting rod boring.

[0053] Example 2: This example is basically the same as the previous example, except that the synchronization mechanism 5 includes a protective shell 501. The protective shell 501 is fixedly installed on the front of the rotating seat 1. Two rotating shafts 502 are fixedly connected between the back of the inner wall of the protective shell 501 and the rotating seat 1. Gear 503 is fixedly sleeved on the outer surface of each of the two rotating shafts 502. Gear 504 meshes with the outer surface of each of the two gears 503. The same rack 505 meshes between the outer surfaces of the two gears 503. The rack 505 is slidably installed on the inner wall of the protective shell 501 through the sliding component 506.

[0054] More specifically, the sliding assembly 506 includes a slide rail 5061, which is fixedly installed on the top of the inner wall of the protective shell 501. Multiple sliders 5062 are slidably connected inside the slide rail 5061. All sliders 5062 are fixedly connected to the rack 505. The sliding assembly 506 is used to limit the rack 505 and improve the stability of the rack 505 during movement, thereby ensuring the stability of the rack 505 transmission. This allows one gear 503 to transmit kinetic energy to the rack 505, and then the rack 505 can transmit kinetic energy to another gear 503, so that the two gears 503 can rotate synchronously.

[0055] More specifically, one gear 2 504 is fixedly sleeved on the outer surface of the rotating shaft 1 203, and the other gear 2 504 is fixedly sleeved on the outer surface of the rotating shaft 2 3.

[0056] During the process of changing the position of the large and small ends of the connecting rod clamped and fixed on the clamping part 2, the rotating shaft 203 on the clamping part 2 rotates, driving the gear 504 fixedly connected to it to rotate, which in turn drives the gear 503 meshing with the gear 504 to rotate. Then, the kinetic energy is transmitted to another gear 503 through the rack 505, which then drives the other gear 504 to rotate, and drives the rotating shaft 3 to rotate synchronously. This allows the counterweight 4 to be adjusted synchronously through the synchronization mechanism 5 when changing the position of the large and small ends of the connecting rod clamped and fixed on the clamping part 2. This ensures that the common center of gravity of the clamping part 2 and the connecting rod and the center of gravity of the counterweight 4 are always symmetrically set around the axis of the rotating seat 1, which is beneficial to the uniform distribution of the fixture mass. The centrifugal force generated during rotation cancels each other in all directions, reducing vibration, thereby improving the surface quality and dimensional accuracy of the connecting rod boring.

[0057] Example 3: This example is basically the same as the previous example, except that a rectangular block 6 is fixedly installed on the front of the rotating seat 1. The center of gravity of the rectangular block 6 and the center of gravity of the synchronization mechanism 5 are symmetrically distributed about the axis of the rotating seat 1. Specifically, the mass of the rectangular block 6 is the same as the weight of the synchronization mechanism 5.

[0058] The rectangular block 6 is used to counterweight the synchronization mechanism 5, which helps to distribute the weight of the fixture evenly and thus facilitates stable operation when the fixture rotates at high speed.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable fixture for precision boring of connecting rods, comprising a rotary seat (1), characterized in that: A clamping part (2) is rotatably connected to one side of the front of the rotating seat (1). A connecting rod is clamped and fixed on the clamping part (2). A counterweight (4) is rotatably connected to the front of the rotating seat (1) through a rotating shaft (3). The counterweight (4) and the clamping part (2) are symmetrically arranged about the axis of the rotating seat (1). The total mass of the clamping part (2) and the connecting rod is the same as the mass of the counterweight (4). The common center of gravity of the clamping part (2) and the connecting rod is symmetrically arranged about the axis of the rotating seat (1) with respect to the center of gravity of the counterweight (4). The clamping part (2) and the counterweight (4) are connected by a synchronization mechanism (5); When the positions of the large and small ends of the connecting rod are changed, the counterweight (4) is adjusted synchronously by the synchronization mechanism (5), so that the common center of gravity of the clamping part (2) and the connecting rod and the center of gravity of the counterweight (4) are always symmetrically set about the axis of the rotating seat (1).

2. The adjustable fixture for precision boring of connecting rods according to claim 1, characterized in that: The clamping part (2) includes a clamping seat (201) and two limiting sleeves (202). The clamping seat (201) is rotatably mounted on one side of the front of the rotating seat (1) via a rotating shaft (203). A limiting seat (204) is fixedly connected to the front of the clamping seat (201). A positioning groove (209) adapted to the size of the connecting rod is opened on the front of the limiting seat (204), and a clamping part is hinged to the front of the limiting seat (204). The clamping frame (205) has a locking bolt (206) movably inserted at one end away from the hinged end with the limiting seat (204). The limiting seat (204) has a bolt hole (207) on its front side corresponding to the position of the locking bolt (206). The clamping frame (205) is locked and fixed to the limiting seat (204) by the cooperation of the locking bolt (206) and the bolt hole (207). The clamp seat (201) is provided with a limiting mechanism (208) on the front side. The limiting mechanism (208) and the limiting sleeve (202) are used together to limit and fix the clamp seat (201).

3. An adjustable fixture for precision boring of connecting rods according to claim 2, characterized in that: Both of the limiting sleeves (202) are fixedly embedded on the front of the rotating seat (1). The two limiting sleeves (202) are symmetrically distributed around the axis of the first rotating shaft (203), and one of the limiting sleeves (202) is positioned corresponding to the limiting mechanism (208).

4. An adjustable fixture for precision boring of connecting rods according to claim 2, characterized in that: The limiting mechanism (208) includes a fixing block (2081) fixedly installed on the front of the clamp seat (201). A rectangular rod (2082) is movably installed through the fixing block (2081). A pull rod (2083) and a circular plate (2084) are fixedly connected to the front end and rear end of the rectangular rod (2082), respectively. A limiting pin (2085) is fixedly connected to the rear side of the circular plate (2084). A compression spring (2086) is fixedly connected between the circular plate (2084) and the fixing block (2081). The compression spring (2086) is movably sleeved on the outside of the rectangular rod (2082).

5. An adjustable fixture for precision boring of connecting rods according to claim 4, characterized in that: The limiting pin (2085) is movably inserted inside one of the limiting sleeves (202).

6. An adjustable fixture for precision boring of connecting rods according to claim 1, characterized in that: The synchronization mechanism (5) includes a protective shell (501), which is fixedly installed on the front of the rotating seat (1). Two rotating shafts (502) are fixedly connected between the back of the inner wall of the protective shell (501) and the rotating seat (1). Gear 1 (503) is fixedly sleeved on the outer surface of each of the two rotating shafts (502). Gear 2 (504) meshes with the outer surface of each of the two gears 1 (503). The same rack (505) meshes between the outer surfaces of the two gears 1 (503). The rack (505) is slidably installed on the inner wall of the protective shell (501) through a sliding component (506).

7. An adjustable fixture for precision boring of connecting rods according to claim 6, characterized in that: The sliding assembly (506) includes a slide rail (5061), which is fixedly installed on the top of the inner wall of the protective shell (501), and a plurality of sliders (5062) are slidably connected inside the slide rail (5061).

8. An adjustable fixture for precision boring of connecting rods according to claim 7, characterized in that: The multiple sliders (5062) are all fixedly connected to the rack (505).

9. An adjustable fixture for precision boring of connecting rods according to claim 6, characterized in that: One of the gears (504) is fixedly sleeved on the outer surface of the shaft (203), and the other gear (504) is fixedly sleeved on the outer surface of the shaft (3).

10. An adjustable fixture for precision boring of connecting rods according to claim 1, characterized in that: A rectangular block (6) is fixedly installed on the front of the rotating seat (1). The center of gravity of the rectangular block (6) and the center of gravity of the synchronization mechanism (5) are symmetrically distributed around the axis of the rotating seat (1).

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