Cylinder sleeve limiting system of high-pressure casting aluminum alloy slope type box body

Abstract

The invention relates to the technical field of engine casting molds, in particular to a cylinder sleeve limiting system of a high-pressure casting aluminum alloy slope type box, which comprises a mold, a core pulling device fixed on the mold and a limiting assembly connected in the mold in a sliding manner, and the core pulling device is used for driving the limiting assembly to axially move in a mold cavity; the limiting assembly comprises a sliding base connected to the mold in a sliding mode, a sliding block fixed to the sliding base and an insert fixed to the sliding block, and two symmetrically-arranged expansion blocks are connected to the insert in the diameter direction in a sliding mode. A cavity is formed in the center of the insert, an expansion pin is slidably connected into the cavity, and the expansion pin controls the end heads of the two expansion blocks to synchronously eject out or retract towards the peripheral face of the insert through axial movement. A channel is formed in the center of the expansion pin, an air inlet is formed in the sliding seat, one end of the channel is communicated with the cavity in the center of the insert, and the other end of the channel is communicated with the air inlet of the sliding seat. According to the scheme, the cylinder sleeve positioning precision of the engine box can be improved, and the casting process quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of engine casting molds, in particular to a cylinder liner limiting system of a high-pressure cast aluminum alloy sloped box. Background Art

[0002] The cylinder liner is an important component in the engine case. When the engine is working, the piston needs to reciprocate in the cylinder of the case, which will cause friction on the cylinder wall. Therefore, a cylinder liner needs to be installed in the cylinder hole wall to increase strength, reduce wear and extend the service life of the engine.

[0003] Traditional cylinder liner assembly typically uses a press-fit method, where the cylinder liner is directly pressed into the cylinder bore using a press machine. However, due to the high precision required for the fit between the cylinder liner and the cylinder bore, the outer diameter of the cylinder liner and the inner diameter of the cylinder body must be precisely machined to ensure the appropriate interference fit. If machining accuracy is insufficient, the fit may be too loose or too tight after press-fitting. An overly loose fit can cause the cylinder liner to loosen and shift during operation, affecting engine performance; an overly tight fit can cause the cylinder liner to deform or even crack the cylinder body, increasing processing costs and scrap rates.

[0004] In order to solve the defects of the press-fitting process, high-pressure casting technology is used in the engine case manufacturing process due to its advantage of being able to efficiently produce high-precision and high-strength components. When using the high-pressure casting process, the cylinder liner will be placed in the mold cavity before casting. After the aluminum alloy liquid is injected into the mold cavity for forming, the cylinder liner is naturally embedded in the formed case. The high-temperature aluminum alloy liquid is in full contact with the surface of the cylinder liner. Under the action of pressure, a good metallurgical bond or mechanical bite can be formed between the two. This bonding method makes the bonding strength between the cylinder liner and the aluminum alloy matrix higher, and can withstand complex loads such as high temperature, high pressure and mechanical vibration generated when the engine is working. It can also improve the wear resistance, corrosion resistance and heat dissipation performance of the cylinder body, thereby improving the overall performance and service life of the engine. The difficulty in this process is that a fixture needs to be designed to fix the cylinder liner in the mold cavity to prevent the cylinder liner from shifting during the die-casting process. For example, the prior art "A mold insert fixing structure for high-pressure casting" (publication number: CN220196309U) discloses a structure for positioning the cylinder liner. By setting an annular groove and a positioning block on the static mold, the cylinder liner can be sleeved on the static mold, achieving a stable setting when the cylinder liner is pre-set on the static mold. At the same time, under the action of the positioning column, the movable mold and the cylinder liner are abutted through the positioning column, so that both ends of the cylinder liner are simultaneously positioned with the static mold and the movable mold, so that the cylinder liner has better stability between the static mold and the movable mold. However, this fixing method still has the following technical problems: 1. As for the structure of the engine cylinder block, after the cylinder block is formed, the cylinder liner is located inside the cylinder block, and one end of the cylinder liner will be wrapped and covered by the formed aluminum liquid, that is, one end of the cylinder liner is embedded in the metal entity after die-casting. The cylinder liner positioning method of the existing technology is to position the two ends of the cylinder liner by abutting the static mold and the dynamic mold. Therefore, it is only suitable for parts without formed entities at both ends of the cylinder liner. For the cavity structure of the engine cylinder block, one end of the cylinder liner is inside the cylinder block. The use of the cylinder liner positioning method in the existing technology will destroy the molding structure of the cylinder block and cannot complete the die-casting process normally.

[0005] 2. During the die-casting process, the metal liquid is injected into the mold cavity under high pressure. The metal liquid exerts great pressure on the cylinder liner. The existing technology adopts a clamping and positioning method at both ends of the cylinder liner, so that the metal liquid exerts pressure on the cylinder liner from the circumference of the cylinder liner, causing the cylinder liner to have radial displacement. Even if the existing technology designs a circular boss on the movable mold and inserts it into the middle of the cylinder liner for limiting, in order to facilitate the removal of the parts, a gap needs to be designed between the circular boss and the inner hole of the cylinder liner, which will still cause the cylinder liner to have radial displacement due to the pressure impact of the metal liquid during the die-casting process, resulting in insufficient positioning accuracy of the cylinder liner and changes in the fitting clearance between the piston and the cylinder liner, thereby affecting the combustion efficiency and the power output of the engine. Summary of the Invention

[0006] The present invention provides a cylinder liner limiting system for a high-pressure cast aluminum alloy sloped box body, which can solve the problems in the prior art that the cylinder liner positioning structure will destroy the molded cylinder body molding structure when applied to the engine cylinder block, and at the same time cannot overcome the metal liquid pressure, causing radial displacement of the cylinder liner, resulting in insufficient cylinder liner positioning accuracy and affecting engine performance.

[0007] The present application provides the following technical solution: a cylinder liner limiting system for a high-pressure cast aluminum alloy sloped housing, comprising a mold, a core puller fixed to the mold, and a limiting assembly slidably connected to the mold, wherein the core puller is used to drive the limiting assembly to move axially within the mold cavity; The limiting assembly includes a slide slidably connected to the mold, a slider fixed to the slide, and an insert fixed to the slider. Two symmetrically arranged expansion blocks are slidably connected to the insert in the diameter direction. A cavity is formed in the center of the insert, and an expansion pin is slidably connected in the cavity. The expansion pin is located between the two expansion blocks. The expansion pin controls the end portions of the two expansion blocks to be simultaneously ejected or retracted toward the outer peripheral surface of the insert through axial movement. A channel is provided in the center of the expansion pin, and an air inlet is provided on the slide. One end of the channel is connected to the cavity in the center of the insert, and the other end of the channel is connected to the air inlet of the slide. The air inlet is used to blow air into the sliding gap between the insert and the expansion block.

[0008] Beneficial effects: 1. Improve the positioning accuracy of the cylinder liner and have strong applicability: the cylinder liner can be sleeved on the outer periphery of the insert by using the expansion block and the expansion pin. The axial movement of the expansion pin drives the two expansion blocks to expand and position from the inside of the cylinder liner. Compared with the existing technology that adopts the positioning mode of abutting the two ends of the cylinder liner, for the cavity structure of the engine cylinder block where one end of the cylinder liner needs to be embedded in a metal solid, the positioning process of this solution does not directly contact the cylinder block forming part, avoiding the problem of damage to the forming structure caused by interference from the positioning device, ensuring the integrity and accuracy of the cylinder block die-casting, and enabling the cylinder block die-casting process with a complex cavity structure to be smoothly implemented. It is suitable for a variety of cylinder block structures and has strong applicability. When the die is cast, the expansion pin can accurately control the two expansion blocks to be ejected synchronously toward the outer peripheral surface of the insert through axial movement, thereby firmly expanding and fixing the cylinder liner in the mold. When facing the high-pressure impact of the metal liquid during the die-casting process, this structure can provide stable and uniform supporting force from the inside of the cylinder liner, effectively offset the circumferential pressure of the metal liquid on the cylinder liner, and prevent the cylinder liner from radial displacement. Compared with the positioning method in the prior art that relies on external clamping and has a gap, this internal expansion positioning can achieve higher positioning accuracy, ensure the position stability of the cylinder liner in the mold, and then ensure that the fitting clearance between the piston and the cylinder liner meets the design requirements, which significantly improves the performance of the engine.

[0009] 2. Prevent the risk of insert jamming and improve component life: Due to the high die-casting pressure of the high-pressure die-casting process, the metal liquid can easily penetrate from the gap between the insert and the cylinder liner into the gap between the expansion block and the insert. After the metal liquid is shaped, the insert and the expansion block will be stuck, making it difficult for the insert to be removed from the cylinder liner, resulting in the problem of being unable to remove the part. This is one of the reasons why the existing process does not use cylinder liner inner hole expansion positioning. This solution sets a channel in the center of the expansion pin. After the mold is opened and the product is taken out, compressed air is blown into the air inlet of the slide seat. The compressed air enters the cavity of the insert through the channel and blows out the aluminum skin in the gap between the insert and the expansion block to avoid the situation where the aluminum skin in the gap between the insert and the expansion block becomes thicker and jams the expansion block after multiple die-castings. This ensures that the expansion block can slide freely in the gap, maintains reliable expansion and reset functions for a long time, significantly extends the service life of the limit component, ensures the continuity and stability of die-casting production, and reduces economic losses caused by component damage.

[0010] 3. Improve the sliding stability and positioning accuracy of the insert: The design of the expansion pin center channel connected to the slide air inlet can blow air into the sliding gap between the insert and the expansion block. During the die-casting process, the high-pressure gas can promptly blow away metal debris, impurities, etc. that enter the sliding gap, preventing impurities from affecting the normal sliding stability and positioning accuracy of the expansion block.

[0011] 4. Compact structure, easy operation and improved production efficiency: The limit assembly cleverly integrates the slide, slider, insert, expansion block and expansion pin and other components. The overall structure is compact and occupies little space. It is easy to install on the mold and will not cause excessive interference with the overall structure of the mold and other components. At the same time, by controlling the axial movement of the expansion pin and the ventilation of the air inlet hole, the cylinder liner can be quickly positioned, expanded and cleaned. The operation process is simple and convenient, which is conducive to improving production efficiency. Furthermore, the contact surface between the expansion block and the expansion pin is an inclined surface.

[0012] Beneficial effects: 1. Self-locking effect, resisting high-pressure shocks. The inclined surface structure converts the axial thrust of the expansion pin into radial tension in the expansion block, creating a mechanism similar to a "wedge lock." When the metal liquid applies high pressure to the cylinder liner, the outward thrust of the expansion block reacts on the inclined surface, increasing the axial resistance of the expansion pin and creating a self-locking effect. This effect automatically enhances positioning rigidity under high-pressure environments, significantly improving the stability and accuracy of cylinder liner positioning by significantly surpassing the defects of traditional flat contact structures that are prone to loosening due to vibration or pressure fluctuations.

[0013] 2. Automatic Gap Elimination: Over extended use, the inclined contact surface allows the expansion block to automatically adjust its position within a narrow range, compensating for wear gaps caused by friction. For example, if the contact surface between the expansion block and the cylinder liner exhibits 0.01mm of wear, the inclined surface structure maintains a tight fit through a slight axial displacement of the expansion pin, ensuring long-term stable positioning accuracy. Conventional rigid structures require frequent adjustments or component replacement.

[0014] Furthermore, the end of the expansion pin away from the expansion block extends into the slider and is slidably connected to the slider, and the end of the expansion pin located in the slider is connected to a nut using an external thread, and a reset spring is sleeved on the rod of the expansion pin, and the end face of the nut blocks the reset spring in the installation cavity inside the slider.

[0015] Beneficial effect: When the expansion pin moves circumferentially into the cavity at the center of the insert, the return spring is in a gradually compressed state, thereby buffering the nut, reducing the impact load of the expansion block on the cylinder liner, and reducing wear. After the die-casting is completed, the return spring can quickly return the expansion pin to its position, allowing the expansion block to remove the expansion force on the cylinder liner, so as to facilitate the rapid removal of the workpiece.

[0016] Furthermore, one end of the expansion pin connected to the threaded hole in the nut is an expansion sleeve structure, a tapered hole is provided in the center of the expansion sleeve structure, and a screw is also threadedly connected to the center of the expansion sleeve structure, and the outer peripheral surface of the end of the screw is a conical surface that matches the tapered hole.

[0017] Beneficial effect: Since the nut is threadedly connected to the end of the expansion pin, and the expansion pin needs to move axially back and forth multiple times during the die-casting process, it is easy to cause the nut to loosen. When the nut loosens, the axial compression stroke of the reset spring will change, which can easily affect the reset and buffering effects. If the nut is directly connected to the end of the expansion pin in a rigid fixation manner, the reset spring cannot be disassembled and assembled portablely. Therefore, an expansion sleeve structure is provided at the end of the expansion pin. By tightening the screw, the conical surface of the screw head will press against the conical hole, causing the expansion sleeve structure to expand outward, thereby tightening the nut in turn to prevent the nut from loosening, effectively restraining the nut, ensuring the compression stroke of the reset spring, and ensuring the reset effect and buffering effect. Furthermore, a T-pin is provided at one end of the nut away from the reset spring, a push spring is sleeved on the rod of the T-pin, and a push rod is slidably connected to the end of the T-pin away from the nut. The push rod is slidably connected in the slide seat, and the push rod is sleeved on the tail end of the T-pin.

[0018] Beneficial Effects: The push spring and return spring form a two-stage elastic system. On the one hand, the thrust of the push rod compresses the push spring, causing it to push the T-pin and transmit the thrust to the nut to achieve axial movement of the expansion pin. When the expansion pin is reset, the push spring first provides the initial thrust, allowing the expansion pin to overcome static friction and start; then the return spring releases the main reset force. This graded loading method makes the reset process smoother, reduces the impact vibration of the expansion pin during reset, and ensures the stability of the reset action of all limit components. At the same time, the push spring shares part of the initial load of the return spring, which extends the service life of both springs.

[0019] Furthermore, the T-pin and the push rod are provided with connected radial through holes, the outer periphery of the push rod is provided with an annular groove, the center of the screw and the T-pin is provided with an axial through hole, and the air inlet hole on the sliding seat is connected with the annular groove, the radial through hole, the axial through hole and the channel in the center of the expansion pin in sequence.

[0020] Beneficial effects: An efficient gas transmission path is constructed, so that the compressed gas can smoothly flow from the slide seat air inlet through the ring groove, radial through hole, axial through hole, and finally into the expansion pin center channel and the insert cavity. This helps to use compressed gas to blow out the aluminum skin in the sliding gap between the insert and the expansion block after the mold is opened and the workpiece is removed, preventing the aluminum skin from blocking the gap between the expansion block and the insert after multiple die-castings, avoiding the expansion block from being stuck, ensuring the normal operation of the positioning component, and ensuring the stability of the limit component during continuous processing.

[0021] Furthermore, a push hole is provided at the tail end of the slide seat, and a connector is slidably connected in the push hole. One end of the connector is against the tail end of the push rod, and the other end of the connector is fixedly connected to the piston rod of the core puller.

[0022] Beneficial effects: When the core puller drives the piston rod to extend and retract, it can drive the connecting head, push rod, T-pin and expansion pin to move, so as to realize the automatic expansion and resetting of the cylinder liner by the expansion block. At the same time, when the connecting head moves to the end position of the push hole, it drives the slide to slide, so as to facilitate the extension of the expanded cylinder liner into the mold cavity, realizing the operation sequence of first expanding and then feeding the cylinder liner, without manual intervention, greatly improving the degree of automation and production efficiency of die-casting production. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the front view of the present invention.

[0024] Figure 2 for Figure 1 Enlarged view of the center limit stop assembly.

[0025] Figure 3 for Figure 2 A magnified view of the connection between the center insert and the slider.

[0026] Figure 4 for Figure 2 Magnified view of center A.

[0027] Figure 5 for Figure 2 Magnified view of B. DETAILED DESCRIPTION

[0028] The following is further described in detail through specific implementation methods: The marks in the drawings of the specification include: mold 1, sloped box 2, mold core 3, limit assembly 4, core puller 5, insert 6, cavity 601, cylinder liner 7, expansion block 8, expansion pin 9, expansion sleeve structure 901, tapered hole 902, channel 903, slider 10, return spring 11, nut 12, T-pin 13, push spring 14, push rod 15, radial through hole 151, annular groove 152, air inlet 153, slide seat 16, exhaust hole 17, connector 18, push hole 19, screw 20, axial through hole 21.

[0029] Example 1 like Figures 1 to 5 As shown, the cylinder sleeve 7 limiting system of the high-pressure cast aluminum alloy sloped case body includes a mold 1, a core puller 5 fixed on the mold 1 and a limiting component 4 slidably connected to the mold 1. The core puller 5 is used to drive the limiting component 4 to move axially in the mold cavity of the mold 1. The core puller 5 is selected according to actual conditions. In this embodiment, a hydraulic cylinder is used; a mold core 3 is provided in the center of the mold 1. The product in this example is a crankcase with a sloped case body 2. After the product is formed, it is on the mold core 3.

[0030] like Figure 2As shown, the limiting assembly 4 includes a slide 16 slidably connected to the mold 1, a slider 10 fixed to the end of the slide 16, and an insert 6 fixed to the slider 10. like Figure 2 and Figure 3 As shown, two symmetrically arranged expansion blocks 8 are slidably connected to the insert 6 in the diameter direction; a cavity 601 is provided at the center of the insert 6, and a expansion pin 9 is slidably connected in the cavity 601. A channel 903 is provided at the center of the expansion pin 9, and the channel 903 is communicated with the cavity 601 at the center of the insert 6. The expansion pin 9 is located between the two expansion blocks 8. The contact surface between the expansion block 8 and the expansion pin 9 is an inclined surface. The expansion pin 9 controls the end heads of the two expansion blocks 8 to be simultaneously ejected or retracted toward the outer peripheral surface of the insert 6 through axial movement. In actual application, the inner hole of the cylinder liner 7 is provided with two symmetrical grooves, and the positions of the grooves correspond to the positions of the two expansion blocks 8 ejecting the outer peripheral surface of the insert 6, so that the cylinder liner 7 can be tightened after the expansion blocks 8 are ejected, and the circumferential wall surface of the groove in the inner hole of the cylinder liner 7 is outward-expanded, which is convenient for the expansion blocks 8 to be removed after the expansion force is removed.

[0031] like Figure 2 and Figure 4 As shown, the end of the expansion pin 9 away from the expansion block 8 extends into the slider 10 and is slidably connected to the slider 10, and the end of the expansion pin 9 located in the slider 10 is connected to the nut 12 by an external thread, and a reset spring 11 is sleeved on the rod of the expansion pin 9, and the end face of the nut 12 blocks the reset spring 11 in the installation cavity inside the slider 10; the end of the expansion pin 9 connected to the threaded hole in the nut 12 is an expansion sleeve structure 901, and a tapered hole 902 is provided in the center of the expansion sleeve structure 901. The center of the expansion sleeve structure 901 is also threadedly connected to a screw 20, and the outer peripheral surface of the end of the screw 20 is a conical surface that matches the tapered hole 902.

[0032] like Figure 2 、 Figure 3 and Figure 4 As shown, a T-pin 13 is provided at the end of the nut 12 away from the return spring 11. A push spring 14 is sleeved on the rod of the T-pin 13. A push rod 15 is slidably connected to the end of the T-pin 13 away from the nut 12. The push rod 15 is slidably connected within a slide 16 and sleeved on the tail end of the T-pin 13. A radial through hole 151 is connected to the T-pin 13 and the push rod 15. An annular groove 152 is provided on the outer periphery of the push rod 15. An axial through hole 21 is provided in the center of the screw 20 and the T-pin 13.

[0033] like Figure 2 and Figure 5 The rear end of the slide 16 is provided with a push hole 19, in which a connector 18 is slidably connected. One end of the connector 18 abuts against the rear end of the push rod 15, and the other end of the connector 18 is fixedly connected to the piston rod of the core puller 5.

[0034] like Figure 2 and Figure 5 As shown, the slide 16 is provided with an air inlet 153, which sequentially communicates with the annular groove 152, the radial through hole 151, the axial through hole 21, and the channel 903 in the center of the expansion pin 9. The slide 16 is also provided with an air vent 17, which communicates with the mounting cavity within the slide 16 and the slider 10, which houses the expansion pin 9, the return spring 11, the screw 20, the T-pin 13, and the push spring 14.

[0035] The method of using this system is as follows: like Figures 2 to 5 As shown, first, the piston rod of the core puller 5 drives the connecting head 18 to move to the left, and transmits the thrust to the push rod 15, the push spring 14, the T-pin 13, and the nut 12 in turn to drive the expansion pin 9 to move axially. At this time, the return spring 11 and the push spring 14 are gradually compressed. Since the contact surface between the expansion block 8 and the expansion pin 9 is an inclined surface, the axial movement of the expansion pin 9 causes the end heads of the two expansion blocks 8 to be simultaneously ejected toward the outer peripheral surface of the insert 6, and the inner hole of the cylinder sleeve 7 is provided with a groove corresponding to the ejection position of the expansion block 8. After the expansion block 8 is ejected, it is embedded in the groove, thereby achieving expansion and compression of the cylinder sleeve 7; then, the connecting head 18 continues to be pushed to the left until the end of the connecting head 18 is pressed against the wall of the push hole 19 close to the push rod 15, which will drive the entire slide 16 to move axially, thereby sending the cylinder sleeve 7 into the mold cavity of the mold 1, and then the mold is closed and the high-pressure die-casting process is completed normally; etc. Finally, the core puller 5 drives the connecting head 18 to reset, and the reset spring 11 and the push spring 14 rebound and drive the expansion pin 9 to move to the right. The two expansion blocks 8 remove the expansion force of the expansion pin 9 and loosen. Finally, the connecting head 18 moves to the right and drags the entire slide 16 to the right to move the insert 6 out of the cylinder sleeve 7, which is convenient for the subsequent removal of the formed product; after the product is taken out, compressed air enters from the air inlet 153, passes through the annular groove 152, the radial through hole 151, the axial through hole 21, the channel 903 in the center of the expansion pin 9, and the cavity 601 of the insert 6, and finally blows out the aluminum skin in the circumferential gap between the insert 6 and the expansion block 8, preventing the aluminum skin in the gap between the expansion block 8 and the insert 6 from thickening and getting stuck after multiple die-casting, ensuring that the expansion block 8 can slide freely in the gap, maintain reliable expansion and reset functions for a long time, and ensure the continuity and stability of die-casting production.

[0036] The above are only embodiments of the present invention. The invention is not limited to the fields involved in this implementation case. Common knowledge such as the specific structure and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the scope of protection of the present invention. 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 limiting system of the high-pressure cast aluminum alloy sloped box body is characterized by: It includes a mold, a core puller fixed on the mold and a limit assembly slidably connected in the mold, and the core puller is used to drive the limit assembly to move axially in the mold cavity; The limiting assembly includes a slide slidably connected to the mold, a slider fixed to the slide, and an insert fixed to the slider. Two symmetrically arranged expansion blocks are slidably connected to the insert in the diameter direction. A cavity is formed in the center of the insert, and an expansion pin is slidably connected in the cavity. The expansion pin is located between the two expansion blocks. The expansion pin controls the end portions of the two expansion blocks to be simultaneously ejected or retracted toward the outer peripheral surface of the insert through axial movement. A channel is provided in the center of the expansion pin, and an air inlet is provided on the slide. One end of the channel is connected to the cavity in the center of the insert, and the other end of the channel is connected to the air inlet of the slide. The air inlet is used to blow air into the sliding gap between the insert and the expansion block.

2. The cylinder liner limiting system of the high-pressure casting aluminum alloy sloped box according to claim 1 is characterized in that: The contact surface between the expansion block and the expansion pin is an inclined surface.

3. The cylinder liner limiting system of the high-pressure casting aluminum alloy sloped box according to claim 2 is characterized in that: The end of the expansion pin away from the expansion block extends into the slider and is slidably connected to the slider, and the end of the expansion pin located in the slider is connected to a nut using an external thread. A reset spring is sleeved on the rod of the expansion pin, and the end face of the nut blocks the reset spring in the installation cavity inside the slider.

4. The cylinder liner limiting system of the high-pressure casting aluminum alloy sloped box according to claim 3 is characterized in that: The expansion pin is connected to one end of the threaded hole in the nut to form an expansion sleeve structure. A tapered hole is provided in the center of the expansion sleeve structure. A screw is also threadedly connected to the center of the expansion sleeve structure. The outer peripheral surface of the end of the screw is a tapered surface that matches the tapered hole.

5. The cylinder liner limiting system of the high-pressure casting aluminum alloy sloped box according to claim 4 is characterized in that: The end of the nut away from the reset spring is provided with a T-pin, the rod of the T-pin is sleeved with a push spring, the end of the T-pin away from the nut is slidably connected to a push rod, the push rod is slidably connected in the slide seat, and the push rod is sleeved on the tail end of the T-pin.

6. The cylinder liner limiting system of the high-pressure casting aluminum alloy sloped housing according to claim 5 is characterized in that: The T-pin and the push rod are provided with connected radial through holes, the outer periphery of the push rod is provided with an annular groove, the center of the screw and the T-pin is provided with an axial through hole, and the air inlet hole on the slide seat is connected with the annular groove, the radial through hole, the axial through hole and the channel in the center of the expansion pin in sequence.

7. The cylinder liner limiting system of the high-pressure casting aluminum alloy sloped housing according to claim 6 is characterized in that: The tail end of the slide is provided with a pushing hole, in which a connector is slidably connected, one end of the connector is against the tail end of the pushing rod, and the other end of the connector is fixedly connected to the piston rod of the core puller.

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