Automatic mounting clamp for cylinder sleeve

Abstract

The invention relates to the technical field of engine cylinder block die-casting processes, in particular to an automatic cylinder sleeve installation clamp which comprises an installation frame, a clamping mechanism fixed to the installation frame and a pushing mechanism fixed to the installation frame. Positioning seats are oppositely arranged at the two ends of the interior of the mounting frame, and a cross rod is fixed between the positioning seats; the device further comprises an adjusting mechanism fixed above the clamping mechanism, and the adjusting mechanism comprises a plurality of partition plates fixed to the transverse rod and fine adjustment assemblies located between the partition plates. The fine adjustment assembly comprises an I-shaped block connected to the transverse rod in a sliding mode, a plurality of threaded sleeves fixed to the middle of the I-shaped block and compression springs located in the threaded sleeves. The compression springs in the adjacent threaded sleeves are arranged in opposite directions, and the ends, extending out of the heads of the threaded sleeves, of the compression springs abut against the partition plate or the wall face of the positioning base. The clamp can cope with the thermal shrinkage influence of the mold, the position of the cylinder sleeve in the mold can be automatically adjusted, and the machining efficiency can be improved while the production safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of die-casting technology for an engine cylinder block, in particular to an automatic cylinder sleeve mounting fixture. Background Art

[0002] An engine is a machine that can convert other forms of energy into mechanical energy, including internal combustion engines, external combustion engines, gas turbines and jet engines. There are many types of internal combustion engines. Common gasoline engines and diesel engines are typical internal combustion engines, which are widely used in vehicles and engineering machinery.

[0003] The cylinder block of an internal combustion engine is equipped with a cylindrical empty chamber, also called a cylinder. The cylinder is equipped with a piston pushed by the pressure or expansion force of the working fluid. The piston slides and rubs in the cylinder, which can withstand the pressure of the combustion gas in the cylinder and transmit the pressure of the gas to the crankshaft to output power. The piston slides at high speed in the cylinder, so a cylinder liner must be embedded in the cylinder. The inner surface of the cylinder liner can withstand high temperature and the side thrust of the piston to improve wear resistance, and the outer surface is in contact with cooling water to reduce the temperature of the cylinder to ensure the normal operation of the internal combustion engine. The cylinder liner is inlaid in the cylinder block during the die-casting process. In industry, a dedicated device is usually used to automatically inlay the cylinder liner. For example, the prior art "Flexible Inlay Picking Device for Automobile Engine Cylinder Block" (Publication No.: CN103611915B) discloses a device that can clamp the cylinder liner and inlay the cylinder liner into the cylinder block. The main structural principle is that the clamping hand first extends into the center of the cylinder liner and supports the cylinder liner, and then uses the piston cylinder to push the cylinder liner into the die cavity for die casting to complete the fixing of the cylinder liner. However, the prior art still has the following technical problems:

[0004] During the high-pressure die-casting process, the mold will be affected by heat shrinkage, resulting in uneven temperature distribution of the mold and inconsistent expansion and contraction. As a result, the positioning of the cylinder liner in the mold will deviate. The devices in the prior art cannot accurately position the cylinder liner based on this deviation, resulting in the cylinder liner being unable to be correctly inserted into the mold, making it impossible to carry out the die-casting process. Summary of the invention

[0005] The present invention provides an automatic cylinder liner installation fixture, which can solve the problem that the cylinder liner installation fixture in the prior art cannot insert the cylinder liner into the correct position in the mold when the mold is affected by heat shrinkage, resulting in the inability to perform a die-casting process.

[0006] The present application provides the following technical solution: a cylinder liner automatic installation fixture, comprising a mounting frame, a clamping mechanism fixed on the mounting frame, and a pushing mechanism fixed on the mounting frame;

[0007] Positioning seats are arranged opposite to each other at two ends of the mounting frame, and a cross bar is fixed between the positioning seats;

[0008] Also included is an adjustment mechanism fixed above the clamping mechanism, the adjustment mechanism comprising a plurality of partitions fixed on the crossbar and a plurality of fine-tuning assemblies located between the partitions;

[0009] The fine-tuning assembly includes an I-block slidably connected to a crossbar, a plurality of threaded sleeves fixed in the middle of the I-block, and a compression spring located in the threaded sleeve; the compression springs in adjacent threaded sleeves are arranged in opposite directions, one end of the compression spring extending out of the head of the threaded sleeve abuts against a partition or a wall surface of a positioning seat, the center distances between adjacent I-blocks are equal, and the center distance of each adjacent I-block can be adjusted individually.

[0010] Beneficial effects:

[0011] 1. Improve processing efficiency and ensure safety. During high-pressure die-casting, the mold will expand and contract inconsistently due to uneven temperature distribution, and the processing errors during mold manufacturing will cause errors in the position of the cylinder sleeve each time it is inserted into the mold. In this solution, when the clamping mechanism clamps the cylinder sleeve and contacts the mold, the floating of the spring allows the clamping mechanism and the cylinder sleeve to automatically fine-tune to the appropriate position, realizing automatic resetting and centering of the cylinder sleeve, so that the cylinder sleeve can be inserted into the mold more smoothly, preventing the cylinder sleeve from hitting the mold due to position deviation or the cylinder sleeve from being unable to be installed in the mold. It can also prevent the manipulator connected to the fixture from being subjected to additional force, avoid damage to the manipulator and the mold, and improve the service life of the equipment and production safety. At the same time, the smooth installation of the cylinder sleeve can improve processing efficiency.

[0012] 2. Strong applicability and convenient use. The compression springs in adjacent threaded sleeves are arranged in opposite directions, so that the clamping mechanism can be reset and centered by the elastic force of the compression springs after fine-tuning. At the same time, the initial position of the clamping mechanism can be adjusted by limiting the length of the compression springs, so as to adapt to molds with different processing precisions and improve applicability and convenience of use.

[0013] 3. Flexible adjustment and wide adaptability. The center distance of each adjacent I-block can be adjusted individually, and can be adjusted and adapted to various types of cylinders, which can be used for multiple products and improve the flexibility of the fixture.

[0014] Furthermore, the clamping mechanism comprises a connecting seat, a driving cylinder and a clamping jaw sleeve which are fixed in sequence below the I-shaped block, and a clamping jaw assembly is arranged inside the clamping jaw sleeve.

[0015] Beneficial effect: By driving the cylinder to control the movement of the clamping jaw assembly, the cylinder sleeve can be clamped and fixed. The connecting seat is used to connect and fix the clamping mechanism with the I-block, so that the elastic force of the compression spring in the fine-tuning assembly can be transmitted to the clamping jaw assembly through the I-block, thereby realizing the cylinder sleeve position adjustment function.

[0016] Furthermore, the clamping jaw assembly includes a central axis, a swing arm and an ejector pin installed in the clamping jaw sleeve; the central axis is slidably connected to the middle part of the clamping jaw sleeve along the axial direction of the clamping jaw sleeve, and the upper end of the central axis is fixed to the piston rod of the driving cylinder; the swing arm is swingably connected in the clamping jaw sleeve, and a plurality of swing arms are provided and evenly distributed around the central axis; the ejector pin is slidably connected to the clamping jaw sleeve along the radial direction of the clamping jaw sleeve, and a plurality of ejector pins are provided and evenly distributed around the central axis, and the end of the ejector pin can slide out of the outer peripheral wall of the clamping jaw sleeve.

[0017] Beneficial effect: The piston rod of the driving cylinder can drive the movement of the middle shaft, and the movement of the middle shaft is converted into radial movement of the ejector pin through the swing arm, so that the ejector pin can support the inner wall of the cylinder liner, tighten the steel sleeve from the inside of the hole of the cylinder liner, and multiple ejector pins are evenly distributed along the axial direction, so that the force of the ejector pin can act more evenly on the inner wall of the cylinder liner, thereby improving the stability of the cylinder liner clamping.

[0018] Furthermore, the swing arm is L-shaped, one end of the swing arm is clamped on the outer periphery of the central shaft, and the other end of the swing arm is clamped on the outer periphery of the ejector pin, and the axial sliding of the central shaft can be converted into radial movement of the ejector pin through the swing arm.

[0019] Beneficial effects: The swing arm can convert the linear motion of the driving cylinder into the radial movement of the ejector pin, which can ensure the synchronous movement of each ejector pin and ensure the movement accuracy and consistency of the ejector pin.

[0020] Furthermore, slots are provided on the outer circumference of the central axis and the outer circumference of the ejection pin, and the two ends of the swing arm are inserted into the slots. A gap is provided between the end of each end of the swing arm and the bottom of the slot, and the portion where the swing arm contacts the side wall of the slot is arc-shaped.

[0021] Beneficial effect: A gap is provided between the end of each end of the swing arm and the bottom of the slot, so as to ensure that the end of the swing arm and the slot have a certain movable space when the central axis moves to prevent jamming, and the contact part between the swing arm and the side wall of the slot is arc-shaped, which helps the end of the swing arm to swing smoothly in the slot and improves the smoothness of the ejector pin when moving.

[0022] Furthermore, the pushing mechanism includes a main cylinder fixed in the mounting frame, a push plate assembly located below the main cylinder and a buffer assembly fixed above the push plate assembly, the push plate assembly includes a connecting plate fixed to the end of the piston rod of the main cylinder, a pressure plate located beside the connecting plate and a strip block fixed between the pressure plate and the connecting plate, the clamping jaw sleeve is inserted into the pressure plate, and the buffer assembly is located above the strip block.

[0023] Beneficial effect: The piston rod of the main cylinder drives the connecting plate to move, and the strip block and the pressure plate follow the movement. Since the clamping jaw sleeve is inserted into the pressure plate, the movement of the main cylinder can initially cause the pressure plate to push the cylinder sleeve on the clamping jaw sleeve, making it easier for the cylinder sleeve to be automatically and synchronously inserted into the mold, thereby improving the consistency and efficiency of the cylinder sleeve installation.

[0024] Furthermore, the buffer assembly includes a column fixed above the bar block, a lower sleeve sleeved on the column rod, an upper sleeve fixed on the upper end of the column, and a spring sleeved on the column rod. The column rod is slidably connected in a positioning seat, the outer periphery of the lower sleeve is fixed in the positioning seat, a circle of steps is provided in the upper sleeve and the lower sleeve, and the upper end face and the lower end face of the spring respectively abut against the steps of the upper sleeve and the lower sleeve.

[0025] Beneficial effect: When the column moves downward with the bar block, the two ends of the spring are respectively against the steps of the upper sleeve and the lower sleeve, so the spring will be compressed, so that when the cylinder sleeve is inserted into the mold, the elastic force of the spring can provide a certain buffer to prevent hard impact between the cylinder sleeve and the mold.

[0026] Furthermore, a linear bearing is sleeved on the column, and the linear bearing is fixed on the mounting frame.

[0027] Beneficial effects: Linear bearings can reduce the friction of the column when it slides, ensure the stability and accuracy of the column when it slides, and improve the smoothness of the sliding. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural axonometric view of the present invention.

[0029] Figure 2 This is the axonometric view after removing the I-beam.

[0030] Figure 3 for Figure 2 Front view with the jaws and pressure plate removed.

[0031] Figure 4 for Figure 2 Axonometric view of the threaded sleeve and compression spring.

[0032] Figure 5 for Figure 3 Magnified view of the middle jaw assembly. DETAILED DESCRIPTION

[0033] The following is further described in detail through specific implementation methods:

[0034] The marks in the drawings of the specification include: I-block 1, bar block 2, compression spring 201, bottom plate 3, positioning seat 4, side plate 5, lower sleeve 6, spring 7, column 8, top plate 9, upper sleeve 10, main cylinder 11, connecting plate 12, pressure plate 13, clamping jaw sleeve 14, partition 15, cross bar 16, connecting seat 17, sliding bearing 18, driving cylinder 19, threaded sleeve 20, clamping jaw assembly 21, driving cylinder piston rod 22, swing arm 23, ejector pin 24, middle shaft 25, slot 26, back plate 27.

[0035] Embodiment 1

[0036] like Figures 1 to 5 As shown, the cylinder liner automatic installation fixture includes a mounting frame, a clamping mechanism fixed at the bottom of the mounting frame, an adjusting mechanism fixed inside the mounting frame, and a pushing mechanism fixed inside the mounting frame, wherein the adjusting mechanism is fixed above the clamping mechanism.

[0037] The mounting frame is in the shape of an outer cover, and includes a bottom plate 3, side plates 5 fixed on both sides of the bottom plate 3, a top plate 9 fixed above the side plates 5, and a back plate 27 fixed on the back. Figure 1 The panel has been omitted to facilitate the display of the internal structure of the mounting frame.

[0038] like Figure 2 As shown, positioning seats 4 are arranged opposite to each other at both ends of the bottom plate 3, and a cross bar 16 is fixed between the positioning seats 4; the adjustment mechanism includes a plurality of partitions 15 fixed on the cross bar 16 at intervals and a fine-tuning assembly located between the partitions 15; the cross bar 16 passes through the partition 15, and the bottom of the partition 15 is fixed to the bottom plate 3; the fine-tuning assembly includes an I-shaped block 1 slidably connected to the cross bar 16, a plurality of threaded sleeves 20 fixed between adjacent I-shaped blocks 1, and a compression spring 201 located in the threaded sleeve 20; the center distances between adjacent I-shaped blocks 1 are equal; the I-shaped block 1 is sleeved on the cross bar 16 through a sliding bearing 18 to achieve smooth axial sliding; in this embodiment, the number of threaded sleeves 20 is two, and the threads are fastened to the middle part of the I-shaped block 1, as shown in FIG. Figure 4 As shown, a circular hole is provided in the middle of the threaded sleeve 20, and a compression spring 201 is provided in the circular hole, and the compression springs 201 in adjacent threaded sleeves 20 are arranged in opposite directions, so that one end of each compression spring 201 extending out of the circular hole of the threaded sleeve 20 abuts against the wall of the partition 15 or the positioning seat 4; the axial sliding of the I-block 1 can be fine-tuned by relying on the floating of the spring 7, and the large head end of the threaded sleeve 20 is also provided with a radial through hole, so as to insert a tool and screw the threaded sleeve 20, so as to adjust the compression amount of the compression spring 201, thereby realizing the distance adjustment function between each I-block 1 and the components below the I-block 1.

[0039] like Figure 2 and Figure 3 As shown, the clamping mechanism includes a connecting seat 17, a driving cylinder 19 and a clamping claw sleeve 14 which are screwed in sequence under the I-shaped block 1. The driving cylinder 19 extends downward from the base plate 3, and there is a gap between the base plate 3 and the through hole of the driving cylinder 19, so that the axial movement of the I-shaped block 1 can drive the driving cylinder 19 to move synchronously through the connecting seat 17.

[0040] A clamping jaw assembly 21 is provided in the clamping jaw sleeve 14. Figure 3 and Figure 5As shown, the clamping jaw assembly 21 includes a central axis 25, a swing arm 23 and an ejector pin 24 installed in the clamping jaw sleeve 14; the central axis 25 is slidably connected to the middle part of the clamping jaw sleeve 14 along the axial direction of the clamping jaw sleeve 14, and the upper end of the central axis 25 is fixed to the driving cylinder piston rod 22; the swing arm 23 is swingably connected to the clamping jaw sleeve 14 through a pin, and a plurality of swing arms 23 are provided and are evenly distributed around the central axis 25; the ejector pin 24 is slidably connected to the clamping jaw sleeve 14 along the radial direction of the clamping jaw sleeve 14, and a plurality of ejector pins 24 are provided and are evenly distributed around the central axis 25. In this embodiment, the number of the swing arm 23 and the ejector pin 24 is set to three. Figure 5 As shown, the swing arm 23 is L-shaped, and a slot 26 is provided on the outer periphery of the central axis 25 and the outer periphery of the ejector pin 24. The two ends of the swing arm 23 can be respectively inserted into the slot 26, and the axial sliding of the central axis 25 can be converted into the radial movement of the ejector pin 24 through the swing arm 23. A gap is provided between the end of each end of the swing arm 23 and the bottom of the slot 26, so that when the central axis 25 moves axially, the end of the swing arm 23 and the slot 26 have a certain movable space to prevent jamming, and the part where the swing arm 23 contacts the side wall of the slot 26 is arc-shaped, which helps the end of the swing arm 23 to swing smoothly in the slot 26 and improves the smoothness of the ejector pin 24 when it moves; the end of the ejector pin 24 can slide out of the outer peripheral wall of the clamping claw sleeve 14, so that it is convenient to tighten the inner wall of the cylinder sleeve when clamping the cylinder sleeve to achieve the fixation of the cylinder sleeve.

[0041] like Figure 1 and Figure 2 As shown, the pushing mechanism includes a main cylinder 11 fixed on the base plate 3, a push plate assembly located below the main cylinder 11 and a buffer assembly fixed above the push plate assembly; the piston rod end of the main cylinder 11 extends below the base plate 3, the push plate assembly includes a connecting plate 12 fixed to the piston rod end of the main cylinder 11, a pressure plate 13 located next to the connecting plate 12 and a strip block 2 fixed between the pressure plate 13 and the connecting plate 12, and a clamping claw sleeve 14 passes through the pressure plate 13 from top to bottom.

[0042] The buffer assembly includes a column 8 fixed above the strip block 2, a lower sleeve 6 sleeved on the rod of the column 8, an upper sleeve 10 fixed on the upper end of the column 8, and a spring 7 sleeved on the rod of the column 8. The bottom of the column 8 passes through the positioning seat 4 and the base plate 3 and is fixed to the strip block 2. A linear bearing is sleeved on the outer periphery of the contact surface between the column 8 and the positioning seat 4. The flange surface of the linear bearing is fixed to the base plate 3 by screws, so that the column 8 can slide relative to the positioning seat 4; the outer periphery of the lower sleeve 6 is fixed to the positioning seat 4, and a circle of steps is provided inside the upper sleeve 10 and the lower sleeve 6. The upper end face and the lower end face of the spring 7 respectively abut against the steps of the upper sleeve 10 and the lower sleeve 6. When the piston rod of the main cylinder 11 drives the connecting plate 12, the strip block 2 and the pressure plate 13 to move downward, the column 8 will follow the downward movement and play a guiding role, and the spring 7 plays a buffering role.

[0043] The use of this fixture is as follows:

[0044] Driven by the automatic manipulator, this set of clamps first goes to the material tray to clamp the cylinder sleeve. When the clamping claw sleeve 14 extends into the inner hole of the cylinder sleeve on the material tray, the cylinder piston rod 22 is driven to extend, and the swing arm 23 swings to make the ejection pin 24 radially eject the outer peripheral wall of the clamping claw sleeve 14, and the end of the ejection pin 24 braces the inner wall of the cylinder sleeve to achieve the clamping of the cylinder sleeve; then, the manipulator drives the clamp to move so that the mouth of the cylinder sleeve is close to the end of the mold core shaft to achieve pre-positioning. In this embodiment, the direction of the cylinder sleeve being inserted into the mold core shaft is: four cylinder sleeves are arranged vertically in a row and then horizontally inserted into the core shaft; when inserting, the manipulator controls the clamp to feed in the direction of the mold core shaft so as to facilitate the insertion of the cylinder sleeve onto the mold core shaft; in this process, due to the floating characteristics of the compression spring 201, the I-block 1 and the drive The cylinder 19 and the clamping jaw sleeve 14 are in an axially floating and adjustable state as a whole. Even if the mold has an installation position error due to heat shrinkage or processing errors, the cylinder sleeve can be automatically corrected when the mouth of the cylinder sleeve contacts the end of the mold, and the cylinder sleeve position can be automatically fine-tuned, so that the cylinder sleeve can be smoothly loaded into the mold; then, the cylinder piston rod 22 is driven to retract, and the swing arm 23 follows the swing control ejector pin 24 to retract radially, and the ejector pin 24 no longer applies a clamping force to the cylinder sleeve. At this time, the piston rod of the main cylinder 11 extends and drives the pressure plate 13 to move, so that the pressure plate 13 can push the rear end face of the cylinder sleeve, thereby causing the cylinder sleeve to detach from the clamping jaw sleeve 14 and be completely pressed onto the mold core shaft; after that, the manipulator drives the fixture out of the working area, and subsequent die-casting operations can be carried out.

[0045] The above are only embodiments of the present invention. The invention is not limited to the fields involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. The cylinder liner automatic installation fixture comprises a mounting frame, a clamping mechanism fixed on the mounting frame, and a pushing mechanism fixed on the mounting frame, and is characterized in that: Positioning seats are arranged opposite to each other at two ends of the mounting frame, and a cross bar is fixed between the positioning seats; Also included is an adjustment mechanism fixed above the clamping mechanism, the adjustment mechanism comprising a plurality of partitions fixed on the crossbar and a plurality of fine-tuning assemblies located between the partitions; The fine-tuning assembly includes an I-block slidably connected to a crossbar, a plurality of threaded sleeves fixed in the middle of the I-block, and a compression spring located in the threaded sleeve; the compression springs in adjacent threaded sleeves are arranged in opposite directions, one end of the compression spring extending out of the head of the threaded sleeve abuts against a partition or a wall surface of a positioning seat, the center distances between adjacent I-blocks are equal, and the center distance of each adjacent I-block can be adjusted individually.

2. The cylinder liner automatic installation fixture according to claim 1 is characterized in that: The clamping mechanism comprises a connecting seat, a driving cylinder and a clamping jaw sleeve which are fixed in sequence below the I-shaped block, and a clamping jaw assembly is arranged in the clamping jaw sleeve.

3. The cylinder liner automatic installation fixture according to claim 2 is characterized in that: The clamping jaw assembly comprises a central axis, a swing arm and an ejector pin installed in the clamping jaw sleeve; the central axis is slidably connected to the middle part of the clamping jaw sleeve along the axial direction of the clamping jaw sleeve, and the upper end of the central axis is fixed to the piston rod of the driving cylinder; the swing arm is swingably connected in the clamping jaw sleeve, and a plurality of swing arms are provided and evenly distributed around the central axis; the ejector pin is slidably connected to the clamping jaw sleeve along the radial direction of the clamping jaw sleeve, and a plurality of ejector pins are provided and evenly distributed around the central axis, and the end of the ejector pin can slide out of the outer peripheral wall of the clamping jaw sleeve.

4. The cylinder liner automatic installation fixture according to claim 3 is characterized in that: The swing arm is L-shaped, one end of the swing arm is clamped on the outer periphery of the central shaft, and the other end of the swing arm is clamped on the outer periphery of the ejector pin. The axial sliding of the central shaft can be converted into radial movement of the ejector pin through the swing arm.

5. The cylinder liner automatic installation fixture according to claim 4 is characterized in that: A slot is provided on the outer circumference of the central axis and the outer circumference of the ejection pin, and the two ends of the swing arm are inserted into the slot. A gap is provided between the end of each end of the swing arm and the bottom of the slot, and the part where the swing arm contacts the side wall of the slot is arc-shaped.

6. The cylinder liner automatic installation fixture according to claim 5, characterized in that: The pushing mechanism includes a main cylinder fixed in the mounting frame, a push plate assembly located below the main cylinder and a buffer assembly fixed above the push plate assembly. The push plate assembly includes a connecting plate fixed to the end of the piston rod of the main cylinder, a pressure plate located beside the connecting plate and a strip block fixed between the pressure plate and the connecting plate. The clamping jaw sleeve is inserted into the pressure plate, and the buffer assembly is located above the strip block.

7. The cylinder liner automatic installation fixture according to claim 6, characterized in that: The buffer assembly includes a column fixed above the bar block, a lower sleeve sleeved on the column rod, an upper sleeve fixed on the upper end of the column, and a spring sleeved on the column rod. The column rod is slidably connected in a positioning seat, the outer periphery of the lower sleeve is fixed in the positioning seat, a circle of steps is provided in the upper sleeve and the lower sleeve, and the upper end face and the lower end face of the spring respectively abut against the steps of the upper sleeve and the lower sleeve.

8. The cylinder liner automatic installation fixture according to claim 7, characterized in that: The column is also sleeved with a linear bearing, which is fixed on the mounting frame.

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