Cylinder cover core setting clamp

Abstract

The cylinder cover core setting clamp comprises a hanging plate, a sand core assembly and a first limiting assembly, the position, close to the side portion, of the sand core assembly is provided with a first mounting hole which is vertically formed in a penetrating mode, the first limiting assembly comprises a hanging column, a plurality of limiting blocks, a transmission assembly and a driving source, and the hanging column is vertically mounted at the bottom end of the hanging plate; the limiting block is slidably arranged in the davit in the radial direction, the transmission assembly is arranged in the davit, the output end of the transmission assembly is matched with the limiting block, and the input end of the transmission assembly is matched with the driving source. The sand core assembly hoisting device has the beneficial effects that by utilizing the first mounting hole penetrating through the side part of the sand core assembly, after the designed hoisting column penetrates through the hole, the driving source drives the transmission assembly to enable the limiting block to extend out in the radial direction and support the sand core assembly, and the mode of hoisting and fixing the sand core assembly is achieved; in this way, clamping structures do not need to be arranged on the left side and the right side of the sand core assembly in an extending mode, so that the transverse space of the clamp is effectively saved, and the damage risk of the sand core assembly in the hoisting process is greatly reduced.

Description

Technical Field

[0001] This application relates to the field of sand casting technology, and in particular to a cylinder head lower core clamp. Background Technology

[0002] Sand casting is a casting process that uses clay-bonded sand as the molding material to produce castings. It mainly includes three categories: wet clay sand, dry clay sand, and surface-dry clay sand. For example... Figure 2 As shown, this is a sand core assembly used for sand casting of automotive cylinder heads. It consists of multiple sand cores of different shapes and functions, such as intake manifold sand cores, exhaust manifold sand cores, water jacket sand cores, and oil passage sand cores. During the sand casting process, the sand core assembly needs to be placed in the designated position, which is the core placement process.

[0003] Fixtures are needed during the core-setting process, such as... Figure 1 As shown, existing clamps use a four-sided clamping method to hold the sand core assembly. For the left and right sides, the clamping components include cylinders and clamping plates to firmly fix the sides of the sand core assembly. This requires providing a certain amount of movement space for the clamping components in the left and right directions. However, the internal space of the fixture used to hold the sand core assembly is limited, causing the clamping components to easily collide and interfere with the inner wall of the fixture during movement, leading to damage to the sand core assembly. Therefore, how to improve the existing clamps to overcome the above problems is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] One of the objectives of this application is to provide a cylinder head lower core clamp.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a cylinder head lower core clamp, including a lifting plate, a sand core assembly, and a first limiting assembly. The sand core assembly has a vertically penetrating first mounting hole near its side. The first limiting assembly includes a lifting column, multiple limiting blocks, a transmission assembly, and a drive source. The lifting column is vertically installed at the bottom end of the lifting plate. The limiting blocks are radially slidably disposed within the lifting column. The transmission assembly is disposed within the lifting column. The output end of the transmission assembly cooperates with the limiting blocks, and the input end of the transmission assembly cooperates with the drive source. During lifting, the lifting column is adapted to move downward and pass through the first mounting hole. Subsequently, the drive source is adapted to drive the limiting blocks to slide and extend out of the lifting column through the transmission assembly, so that the limiting blocks abut against the sand core assembly, thereby achieving vertical support for the sand core assembly.

[0006] Preferably, the transmission assembly includes a piston block, which is vertically and slidably disposed within the cavity of the lifting column; the limiting block cooperates with an elastic element, and the limiting block is adapted to retract into the lifting column under the action of elastic force; during hoisting, the drive source is adapted to drive the piston block to move downward through a pressure medium, and the piston block is adapted to drive the limiting block to slide out through a wedge-shaped compression fit.

[0007] Preferably, the outer side of the limiting block has a slot, and the elastic element is a ring spring. The ring spring is sleeved on the outer periphery of the hanging column and inserted into the slot, thereby realizing the elastic installation of multiple limiting blocks.

[0008] Preferably, the transmission assembly includes a piston block and multiple connecting rods. The piston block is vertically and slidably disposed within the cavity of the lifting column. The two ends of the connecting rods are respectively hinged to the piston block and the corresponding limiting block. During hoisting, the drive source is adapted to drive the piston block downward through a pressure medium, thereby causing the limiting block to slide and extend under the push of the connecting rods.

[0009] Preferably, when the limiting block is fully extended, the connecting rod is parallel or collinear with the axis of the limiting block.

[0010] Preferably, the sand core assembly has a second mounting hole located directly below the first mounting hole, and the diameter of the first mounting hole is larger than the diameter of the second mounting hole; the cylinder head lower core clamp further includes a second limiting assembly, which includes a limiting rod and an elastic cylinder. The limiting rod is installed at the bottom end of the lifting column, and the elastic cylinder is sleeved outside the limiting rod. The interior of the elastic cylinder is connected to the lower end of the cavity through a flow channel inside the limiting rod; during hoisting, the piston block moves downward and, through a pressure medium, drives the elastic cylinder to expand and abut against the second mounting hole, thereby limiting the sand core assembly.

[0011] Preferably, the top of the sand core assembly has multiple vertically arranged second mounting holes near the side; the cylinder head lower core clamp also includes a second limiting assembly, which includes multiple limiting rods and multiple elastic cylinders. The limiting rods are vertically installed at the bottom of the lifting plate, and the elastic cylinders are sleeved on the outside of the corresponding limiting rods and connected to the drive source; during hoisting, the drive source uses a pressure medium to drive the elastic cylinders to expand and abut against the second mounting holes, thereby limiting the sand core assembly.

[0012] Preferably, the outer surface of the elastic cylinder has interlaced anti-slip ribs, which are adapted to increase the friction between the elastic cylinder and the inner wall of the second mounting hole.

[0013] Preferably, the number of the limiting blocks is four or five, and the limiting blocks are evenly distributed along the circumference of the hanging column.

[0014] Preferably, the limiting rod is detachably installed and engaged with the bottom end of the hanging column; the flow channel includes a first groove and a second groove, the first groove is disposed at the axis of the limiting rod and communicates with the cavity, the second groove is disposed outside the limiting rod and communicates with the second groove, and the elastic cylinder covers the outside of the second groove so that the pressure medium can enter the interior of the elastic cylinder through the first groove and the second groove.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: This invention utilizes a first mounting hole penetrating the side of the sand core assembly. After the lifting column passes through this hole, the drive source drives the transmission assembly to cause the limiting block to extend radially and support the sand core assembly, thus realizing a method for hoisting and fixing the sand core assembly. This method eliminates the need to set up clamping structures on the left and right sides of the sand core assembly, thereby effectively saving the lateral space of the clamp and greatly reducing the risk of damage to the sand core assembly during hoisting. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the left and right clamping structures of an existing sand core assembly.

[0017] Figure 2 This is a schematic diagram of the existing sand core assembly structure.

[0018] Figure 3 This is a schematic diagram of the overall structure of the clamp of the present invention.

[0019] Figure 4 This is a partial structural diagram of the present invention.

[0020] Figure 5 This is a schematic diagram of the overall structure of the first limiting component and the second limiting component of the present invention.

[0021] Figure 6 for Figure 5 A cross-sectional structural diagram.

[0022] Figure 7 This is a schematic diagram of the structure of a transmission component according to an embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of the specific structure of the second limiting component of the present invention.

[0024] Figure 9 This is a schematic diagram of the transmission component in Embodiment 2 of the present invention.

[0025] In the diagram: 1. Sand core assembly; 101. First mounting hole; 102. Second mounting hole; 2. Clamping assembly; 201. Cylinder; 202. Clamping plate; 3. Pneumatic gripper; 4. First limiting assembly; 401. Hanging column; 402. Limiting block; 403. Transmission assembly; 4031. Piston block; 4032. Connecting rod; 5. Second limiting assembly; 501. Limiting rod; 502. Elastic cylinder; 6. Cavity; 7. Flow channel; 701. Channel one; 702. Channel two; 8. Ring spring; 9. Slot. Detailed Implementation

[0026] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0028] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0029] Further description of the prior art: such as Figure 1 As shown, in the sand core assembly 1 of the automobile cylinder head, its air inlet and outlet ends are clamped and fixed in the front-to-back direction by pneumatic grippers 3, while in the left-to-right direction, it is limited and fixed by clamping assembly 2. Specifically, clamping assembly 2 includes a cylinder 201 and a clamping plate 202. The cylinder 201 drives the clamping plate 202 to move from the left and right sides of the sand core assembly 1 towards the middle to achieve a tight fit. However, this structure has obvious drawbacks in practical applications: since the space inside the jig to accommodate the sand core assembly 1 is usually quite compact, the extension and retraction of the clamping assembly 2 in the left-to-right (horizontal) direction requires a certain amount of operating space, making it very easy for it to collide or rub against the inner wall of the jig. Especially when the sand core assembly 1 itself has a complex structure and high dimensional accuracy requirements, even a slight collision may cause the sand core assembly 1 to crack, lose sand, or even break completely, which not only affects the casting quality but also increases production costs and production cycle.

[0030] Based on the above technical issues, such as Figure 2 As shown, the inventors of this application discovered two through-holes 101 with relatively large diameters on both sides of the top of the sand core assembly 1. If these two readily available first mounting holes 101 can be used as the core structure for hoisting and limiting, the dependence on lateral space of the traditional horizontal clamping method can be avoided as much as possible.

[0031] Therefore, the inventors of this application have developed a cylinder head lower core clamp, one embodiment of which is, for example... Figures 1 to 9 As shown, the device includes a hanging plate (not shown), a sand core assembly 1, and a first limiting assembly 4. The first limiting assembly 4 includes a hanging column 401, multiple limiting blocks 402, a transmission assembly 403, and a drive source (not shown). The limiting blocks 402 are radially slidably disposed within the hanging column 401. The transmission assembly 403 is disposed within the hanging column 401. The output end of the transmission assembly 403 cooperates with the limiting blocks 402, and the input end of the transmission assembly 403 cooperates with the drive source. The drive source can be mounted on the hanging plate.

[0032] Understandably, in the initial state, the limiting block 402 is retracted into the lifting column 401. At this time, the outer diameter of the lifting column 401 is smaller than the diameter of the first mounting hole 101, so that the lifting column 401 can pass smoothly through the first mounting hole 101. During hoisting, the lifting column 401 moves vertically downward under the action of the lifting plate and passes through the first mounting hole 101. Then, the drive source drives the limiting block 402 to slide radially and extend out of the outer peripheral wall of the lifting column 401 through the transmission assembly 403. At this time, the extended limiting block 402 will stably support the sand core assembly 1 from below, thereby achieving reliable vertical limiting and hoisting fixation of the sand core assembly 1. This design cleverly utilizes the existing first mounting hole 101 of the sand core assembly 1, avoiding the occupation of lateral space by the traditional horizontal clamping method, and effectively solving the problem of easy interference between the clamping assembly 2 and the inner wall of the fixture.

[0033] This application does not specifically limit the structure of the transmission assembly 403. The following two specific embodiments are provided for reference: Example 1 like Figure 6 and Figure 7 As shown, the transmission assembly 403 includes a piston block 4031, which is vertically and slidably disposed within the cavity 6 of the hanging column 401. The limiting block 402 cooperates with the elastic element, that is, the limiting block 402 is slidably disposed within the hanging column 401 through the elastic element. Under normal conditions, the limiting block 402 will retract into the hanging column 401 under the action of elastic force.

[0034] Understandably, during hoisting, the drive source injects pressure into the cavity 6 via a pressure medium, causing the piston block 4031 to move vertically downwards. The lower end of the piston block 4031 and the inner end of the limiting block 402 are designed as a wedge-shaped mating surface. This wedge-shaped surface presses against the wedge-shaped surface of the limiting block 402, thereby overcoming the elastic force of the elastic element and causing the limiting block 402 to slide radially outwards and extend out of the lifting column 401. Conversely, when it is necessary to release the sand core assembly 1, the drive source extracts the pressure medium, and the piston block 4031 moves upwards and resets under pressure. Subsequently, the piston block 4031 automatically retracts into the lifting column 401 under the elastic force of the elastic element, so that the lifting column 401 can be smoothly pulled out from the first mounting hole 101.

[0035] Further optimization, such as Figure 7 As shown, the specific elastic sliding installation method of the limiting block 402 is as follows: the elastic element is a ring spring 8, that is, the spring has an "O" shaped structure. A groove 9 is provided at the outer end of the limiting block 402, and the groove 9 is opened circumferentially along the outer peripheral wall of the limiting block 402. The ring spring 8 is sleeved on the outer periphery of the hanging column 401 and simultaneously inserted into the groove 9 of all the limiting blocks 402. When the limiting block 402 is retracted into the hanging column 401, the ring spring 8 is in a natural or slightly stretched state. When the limiting block 402 is pushed out of the hanging column 401 by the piston block 4031, the ring spring 8 is further stretched and accumulates elastic potential energy, thereby providing a stable elastic force for the reset of the limiting block 402.

[0036] It should be noted that in the prior art, the elastic installation of the limiting block 402 requires a separate independent spring. This not only increases the number of parts and the space required for installation, but also, given the limited space within the hanging column 401 in this application, significantly increases manufacturing difficulty and cost. However, using a ring spring 8 to simultaneously connect multiple limiting blocks 402 ensures synchronized extension and retraction of all limiting blocks 402, simplifies the structure, reduces assembly difficulty and cost, and allows for a more compact installation.

[0037] Example 2 like Figure 9 As shown, the transmission assembly 403 includes a piston block 4031 and multiple connecting rods 4032. The piston block 4031 is vertically and slidably disposed in the cavity 6 of the hanging column 401. The two ends of the connecting rods 4032 are respectively hinged to the piston block 4031 and the corresponding limiting block 402.

[0038] It is understandable that, such as Figure 9As shown in the left figure, this is the initial state of the piston block 4031 and connecting rod 4032 before hoisting. During hoisting, the drive source injects pressure into the cavity 6 through a pressure medium, causing the piston block 4031 to move vertically downward. The connecting rod 4032, which is hinged to it, then pushes the limiting block 402 to slide radially along the lifting column 401, thereby driving the limiting block 402 to slide radially and extend out of the outer peripheral wall of the lifting column 401, as shown in the figure below. Figure 9 The right image in the middle and Figure 4 As shown, this is to support the sand core assembly 1. When the sand core assembly 1 needs to be released, the drive source extracts the pressure medium, the piston block 4031 moves upward and resets under pressure, and the connecting rod 4032 pulls the limit block 402 to slide radially inward, causing it to retract into the hanging column 401.

[0039] Furthermore, in order to provide stable support force after the limit block 402 is fully extended, when the limit block 402 is fully extended, the connecting rod 4032 is parallel or collinear with the axis of the limit block 402, thereby placing the limit block 402 in a dead position, i.e. forming a mechanical lock, which significantly improves the safety and reliability of the hoisting process.

[0040] It should be noted that, when using Embodiment 1, the extrusion fit may lead to a decrease in fit accuracy due to wear, but the structure is relatively simpler and more compact, which has certain advantages for scenarios with strict limitations on installation space. In Embodiment 2, the hinged structure of connecting rod 4032 provides a smoother power transmission process and stronger stability through the design of the dead point position; however, the installation of connecting rod 4032 requires more internal space. Therefore, the size design of the lifting column 401 needs to be comprehensively considered. Those skilled in the art can flexibly select a suitable structural method for the transmission component 403 based on the actual size, weight, and lifting accuracy requirements of the sand core assembly 1.

[0041] Further optimization, such as Figure 7 As shown, considering the limitations of the internal space of the lifting column 401 and the stability of the lifting, the number of limiting blocks 402 is preferably four or five, and the limiting blocks 402 are evenly distributed along the circumference of the lifting column 401. This evenly distributed design can ensure that the sand core assembly 1 is subjected to force balance during the lifting process and avoid deformation or damage to the sand core assembly 1 due to excessive local force.

[0042] In one embodiment of this application, such as Figure 2As shown, a second mounting hole 102 is coaxially located directly below the first mounting hole 101, with the diameter of the first mounting hole 101 being larger than the diameter of the second mounting hole 102. A second limiting component 5 is also provided based on the second mounting hole 102. The second limiting component 5 includes a limiting rod 501 and an elastic cylinder 502. The top end of the limiting rod 501 is connected to the bottom end of the hanging column 401, and the elastic cylinder 502 is sleeved on the outside of the limiting rod 501. The limiting rod 501 and the bottom end of the hanging column 401 are detachably connected, for example, by threaded connection or snap-fit, to facilitate future maintenance. The limiting rod 501 has a flow channel 7 inside, which includes a first channel 701 and a second channel 702. The first channel 701 is located at the axis of the limiting rod 501 and is connected to the cavity 6 inside the hanging column 401. The second channel 702 is located outside the limiting rod 501 and is connected to the first channel 701. The elastic cylinder 502 covers the outside of the second channel 702.

[0043] Understandably, after the lifting column 401 passes through the first mounting hole 101, the limiting rod 501 will insert into the second mounting hole 102. At this time, the drive source injects pressure medium into the cavity 6, thereby pushing the piston block 4031 downward, as... Figure 6 As shown, piston block 4031 compresses cavity 6, and the pressure medium inside cavity 6 enters elastic cylinder 502 through groove one 701 and groove two 702, causing elastic cylinder 502 to expand. The expanded elastic cylinder 502 tightly fits the inner wall of the second mounting hole 102, as shown. Figure 4 As shown, this effectively limits and fixes the sand core assembly 1 in the radial direction, preventing it from shaking or shifting during hoisting. Conversely, when the sand core assembly 1 needs to be released, the upward movement of the piston block 4031 is equivalent to extracting the pressure medium inside the elastic cylinder 502. The elastic cylinder 502 will then contract and reset, separating from the inner wall of the second mounting hole 102, and the limiting rod 501 will be smoothly pulled out from the second mounting hole 102.

[0044] Further preferably, the elastic cylinder 502 can be made of rubber and has crisscrossing anti-slip ribs on its exterior. These anti-slip ribs can significantly increase the friction between the elastic cylinder 502 and the inner wall of the second mounting hole 102, further improving the stability and reliability of the radial limit.

[0045] In one embodiment of this application, such as Figure 2 As shown, the top of the sand core assembly 1 also has multiple second mounting holes 102 located on both sides. Figure 3As shown, a corresponding second limiting component 5 can also be set based on the second mounting hole 102. Of course, the second limiting component 5 is installed on the hanging plate at this time. Specifically, the second limiting component 5 includes a limiting rod 501 and an elastic cylinder 502. The limiting rod 501 is vertically installed at the bottom of the hanging plate, and the elastic cylinder 502 is sleeved on the outside of the corresponding limiting rod 501 and connected to the drive source.

[0046] It is understandable that, such as Figure 3 As shown, during hoisting, the lifting plate moves the limiting rod 501 vertically downward, causing it to insert into the second mounting hole 102 at the top of the sand core assembly 1. Subsequently, the drive source injects pressure medium directly into the elastic cylinder 502, causing it to expand and press tightly against the inner wall of the second mounting hole 102, thus radially limiting the sand core assembly 1 from its top. This method of adding a second limiting component 5 to the top of the sand core assembly 1 forms a multi-point coordinated limiting mechanism with the first limiting component 4 located at the first mounting hole 101 and the second limiting component 5 below it, further improving the overall stability of the sand core assembly 1 during hoisting and effectively preventing rotation or displacement in the horizontal direction.

[0047] Finally, it should be noted that the drive source in this application can be a pneumatic pump or a hydraulic pump, connected to the cavity 6 of the lifting column 401 and the elastic cylinder 502 via pipelines to provide a stable pressure medium. The pressure medium is either compressed air or hydraulic oil. In this application, compressed air is preferred as the pressure medium to avoid contamination caused by hydraulic oil leakage. Of course, in scenarios requiring greater driving force, hydraulic oil can provide a more stable pressure output, and those skilled in the art can choose according to the actual situation. The pneumatic gripper 3 is also common knowledge known to those skilled in the art, and therefore will not be described further.

[0048] The working principle of this invention is as follows: The lifting equipment moves the clamps downward to a suitable position via the lifting plate. For the front and rear sides of the sand core assembly 1, corresponding pneumatic grippers 3 clamp and fix the air inlet and outlet ends of the sand core assembly 1. The left and right sides of the sand core assembly 1 are symmetrical. The lifting column 401, driven by the lifting plate, vertically passes through the first mounting hole 101, causing the corresponding elastic cylinder 502 to enter the lower second mounting hole 102. Simultaneously, multiple limiting rods 501 drive the corresponding elastic cylinders 502 into the second mounting holes 102 on both sides of the top of the sand core assembly 1. Subsequently, the drive source (such as a pneumatic pump) starts and injects compressed air into the lifting column 401 and multiple limiting rods 501 through pipelines. Under pressure, the elastic cylinders 502 expand and abut against the second mounting holes 102, while the limiting blocks 402 extend radially outward, supporting the assembly from below, thus achieving clamping and fixing of the entire sand core assembly 1. Of course, there are also some existing auxiliary fixtures, but for the sake of simplicity, they will not be discussed here. We will only describe the core components of the fixtures.

[0049] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A cylinder head lower core clamp, characterized in that, include: Hanging platform; A sand core assembly, wherein the sand core assembly has a first mounting hole that is vertically through it near its side; as well as The first limiting component includes a hanging column, multiple limiting blocks, a transmission component, and a drive source. The hanging column is vertically installed at the bottom end of the hanging plate. The limiting blocks are radially slidably disposed within the hanging column. The transmission component is disposed within the hanging column. The output end of the transmission component cooperates with the limiting blocks, and the input end of the transmission component cooperates with the drive source. During hoisting, the lifting column is adapted to move down and pass through the first mounting hole; subsequently, the drive source is adapted to drive the limiting block to slide and extend out of the lifting column through the transmission assembly, so that the limiting block abuts against the sand core assembly, thereby achieving vertical support for the sand core assembly.

2. The cylinder head lower core clamp as described in claim 1, characterized in that: The transmission assembly includes a piston block, which is vertically and slidably disposed within the cavity of the hanging column; the limiting block cooperates with an elastic element, and the limiting block is adapted to retract into the hanging column under the action of elastic force; During hoisting, the drive source is adapted to drive the piston block downward by a pressure medium, and the piston block is adapted to drive the limiting block to slide out by a wedge-shaped compression engagement.

3. The cylinder head lower core clamp as described in claim 2, characterized in that: The outer side of the limiting block has a slot, and the elastic element is a ring spring. The ring spring is sleeved on the outer periphery of the hanging column and inserted into the slot, thereby realizing the elastic installation of multiple limiting blocks.

4. The cylinder head lower core clamp as described in claim 1, characterized in that: The transmission assembly includes a piston block and multiple connecting rods. The piston block is vertically and slidably disposed in the cavity of the hanging column. The two ends of the connecting rods are respectively hinged to the piston block and the corresponding limiting block. During hoisting, the drive source is adapted to drive the piston block downward by a pressure medium, thereby causing the limiting block to slide and extend under the push of the connecting rod.

5. The cylinder head lower core clamp as described in claim 4, characterized in that: When the limiting block is fully extended, the connecting rod is parallel or collinear with the axis of the limiting block.

6. The cylinder head lower core clamp as described in any one of claims 2-5, characterized in that: The sand core assembly has a second mounting hole, which is located directly below the first mounting hole, and the diameter of the first mounting hole is larger than the diameter of the second mounting hole; the cylinder head lower core clamp also includes a second limiting assembly, which includes a limiting rod and an elastic cylinder. The limiting rod is installed at the bottom end of the lifting column, and the elastic cylinder is sleeved outside the limiting rod. The interior of the elastic cylinder is connected to the lower end of the cavity through the flow channel inside the limiting rod. During hoisting, the piston block moves downward and, through a pressure medium, drives the elastic cylinder to expand and press against the second mounting hole, thereby limiting the position of the sand core assembly.

7. The cylinder head lower core clamp as described in claim 6, characterized in that: The top of the sand core assembly has multiple vertically arranged second mounting holes near the side; the cylinder head lower core clamp also includes a second limiting assembly, which includes multiple limiting rods and multiple elastic cylinders. The limiting rods are vertically installed at the bottom of the hanging plate, and the elastic cylinders are sleeved on the outside of the corresponding limiting rods and connected to the drive source. During hoisting, the drive source uses a pressure medium to cause the elastic cylinder to expand and press against the second mounting hole, thereby limiting the position of the sand core assembly.

8. The cylinder head lower core clamp as described in claim 7, characterized in that: The outer surface of the elastic cylinder has crisscrossing anti-slip ribs, which are adapted to increase the friction between the elastic cylinder and the inner wall of the second mounting hole.

9. The cylinder head lower core clamp as described in claim 1, characterized in that: The number of limiting blocks is four or five, and the limiting blocks are evenly distributed along the circumference of the hanging column.

10. The cylinder head lower core clamp as described in claim 6, characterized in that: The limiting rod is detachably installed and engaged with the bottom end of the hanging column; the flow channel includes a first groove and a second groove, the first groove is located at the axis of the limiting rod and communicates with the cavity, the second groove is located outside the limiting rod and communicates with the second groove, and the elastic cylinder covers the outside of the second groove so that the pressure medium can enter the interior of the elastic cylinder through the first groove and the second groove.

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