A coated sand core box structure for housing production

Abstract

This invention proposes a coated sand core box structure for housing production, including a base frame defining an internal forming space; at least one pluggable main component that can reciprocate relative to the base frame in a first direction; wherein, the main component integrates an undercut decoupling component, which includes: a pin-shaped part for forming the undercut structure of the sand core and movable relative to the main component in a second direction; and a drive assembly for converting an external input into movement of the pin-shaped part in the second direction, the drive assembly including: a drive source; and a transmission mechanism linked between the drive source and the pin-shaped part. This invention designs a simple and compact mechanical linkage structure, specifically designed for sand core box structures that meet the requirements for processing undercut structures. Simultaneously, it features a single drive source, a simple linkage structure, low manufacturing cost, and high practical application conversion rate.

Description

Technical Field

[0001] This utility model relates to the field of coated sand core box structure, and more particularly to a coated sand core box structure for machine casing production. Background Technology

[0002] Common coated sand core boxes are designed with a pull-out structure in one direction, which makes it impossible to produce coated sand cores with more complex structures, especially coated sand cores with inverted structures.

[0003] Therefore, in order to produce undercut structures such as concave sides and holes on the sidewalls of molded products, some manufacturers must use side core-pulling mechanisms, such as inclined guide pillar-slider mechanisms. However, their movement trajectory is singular and fixed, and they are prone to tearing or damaging the products during demolding.

[0004] To address this issue, the industry has developed complex mechanisms capable of performing step-by-step actions. However, when these complex mechanisms are implemented, the step-by-step action is achieved by adding independent power sources and control systems, resulting in bulky mold structures, high costs, and complex control logic, leading to low reliability and short lifespan. Utility Model Content

[0005] The present invention aims to solve the technical problem in the prior art that the side core pulling mechanism is difficult to balance in terms of structural compactness, low cost and high reliability when realizing step-by-step actions.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A coated sand core box structure for housing production includes: a base frame defining an internal forming space; at least one pluggable main component reciprocating relative to the base frame in a first direction; wherein the main component integrates an undercut decoupling element comprising: a pin-shaped part for the undercut structure of the forming sand core and movable relative to the main component in a second direction; and a drive assembly for converting an external input into movement of the pin-shaped part in the second direction.

[0007] Furthermore, the drive assembly includes: a drive source; and a transmission mechanism, which is linked between the drive source and the pin-shaped parts.

[0008] Furthermore, the driving source is a motor, and the transmission mechanism is a worm gear mechanism, including: a driving worm driven by the motor, which rotates horizontally within the main part; a driven worm wheel fixed to the tail end of a pin-shaped part, which is coupled to the main part and can move up and down within the main part; and the driving worm and driven worm wheel drive each other.

[0009] Furthermore, the driving source is a cylinder, and the transmission mechanism is a gear and rack mechanism, including: a rack connected to the actuating end of the cylinder, the rack sliding horizontally within the main part; a gear fixed to the tail of a pin-shaped part, the pin-shaped part being coupled to the main part and capable of moving up and down within the main part; and gear and rack meshing transmission.

[0010] Furthermore, a spiral guide groove is formed on the outer peripheral wall of the pin-shaped part, and a guide pin that cooperates with the spiral guide groove is provided in the inner hole of the main part, and the guide pin slides in the spiral guide groove.

[0011] Furthermore, the drive assembly includes a wedge-shaped linkage mechanism, comprising: a wedge-shaped push rod detachably connected to the main component; and a wedge located at the bottom of the pin-shaped component, wherein the wedge surface of the wedge-shaped push rod contacts the inclined surface of the wedge.

[0012] Furthermore, the wedge-shaped push rod is a telescopic structure.

[0013] Furthermore, a stepped guide hole is provided on the basic frame, and the pin-shaped part is slidably installed in the stepped guide hole. The pin-shaped part is provided with a limiting step, and the limiting surface of the limiting step matches the stepped surface of the stepped guide hole.

[0014] Furthermore, the basic framework can also be plugged into several components for third-party upward connections.

[0015] Furthermore, the basic frame consists of an upper box and a lower box, and at least one sand-shooting channel is provided on the parting surface of the upper box and the lower box.

[0016] Compared with the prior art, the beneficial effects of this utility model include: This utility model features a simple and compact mechanical linkage structure, specifically designed to meet the requirements of processing sand core boxes with inverted structures. It also boasts a single drive source, a simple linkage structure, low manufacturing cost, and a high conversion rate to practical applications. Attached Figure Description

[0017] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 This is a structural diagram of a coated sand core box in its closed state.

[0018] Figure 2 This is an exploded view of a coated sand core box.

[0019] Figure 3 This is a cross-sectional view of a coated sand core box.

[0020] Figure 4This is a schematic diagram of the drive pin-shaped part of a worm gear mechanism.

[0021] Figure 5 This is a schematic diagram of a pin-shaped part driven by a gear and rack mechanism.

[0022] Figure 6 This is a schematic diagram of the drive pin-shaped part of the wedge-shaped linkage mechanism.

[0023] The following parts are labeled in the diagram: 11. Upper box; 12. Lower box; 21. Main part; 22. Secondary part; 23. Pin-shaped part; 311. Driving worm gear; 312. Driven worm wheel; 321. Wedge; 322. Wedge-shaped push rod; 331. Rack; 332. Gear. Detailed Implementation

[0024] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0025] Example 1 like Figures 1-2 The coated sand core box includes a basic frame and several pluggable molded parts.

[0026] The basic frame includes an upper box 11 and a lower box 12, which can be opened and closed. When closed, at least one sand-shooting channel is left at the parting surface of the two boxes for filling the molding space inside the box with molding material.

[0027] The pluggable molding component includes a main component 21 and auxiliary components 22. Two main components 21 are symmetrically inserted in a first direction between the upper box 11 and the lower box 12, and several auxiliary components 22 are inserted in a third direction. These components, together with the inner wall of the base frame assembly, form the final molding cavity.

[0028] The first direction is Figure 2 The left and right directions, and the third direction is Figure 2 The front and back directions.

[0029] Example 2 like Figures 1-5 Based on Example 1, a sand core box structure specifically designed for inverted shapes is also provided.

[0030] It includes a pin-shaped part 23 and a drive assembly for driving the pin-shaped part 23 to move up and down along its axial direction (second direction) while rotating around its axis.

[0031] The drive assembly includes a motor and a worm gear mechanism. The driving worm gear 311 is driven by the motor via a coupling and a transmission rod, and is installed in a horizontally opened blind hole in the main part 21. The driven worm gear 312 is integrally formed or fixedly connected to the root of the pin-shaped part 23. The outer wall of the pin-shaped part 23 is machined with a helical guide groove that mates with the vertically opened blind hole in the main part 21, allowing the pin-shaped part 23 to move spirally upward within the vertically opened blind hole. A guide pin is fixed in the inner wall of the vertical blind hole, and the guide pin and the helical guide groove are in sliding engagement.

[0032] It should be noted that the driven worm gear 312 is designed to be relatively thick, which allows the pin-shaped part 23 to move up and down while also ensuring that the driving worm 311 and the driven worm gear 312 maintain normal meshing.

[0033] The horizontal blind hole and the vertical blind hole are connected.

[0034] The motor's output torque is converted into the rotational torque of the pin-shaped part 23 via a worm gear drive. Guided by the helical guide groove, this rotational motion is further decomposed into a helical lifting motion. The forward and reverse rotation of the motor precisely controls the extension and retraction of the pin-shaped part 23, and the encoder achieves closed-loop position control to ensure its precise engagement or disengagement from the undercut surface.

[0035] The method of controlling the number of rotations of a motor using an encoder is existing technology, and this embodiment will be briefly described as follows: For every minute rotation of the motor, the encoder sends an electronic pulse signal to the control system. The control system records these pulse signals in real time. By using a preset conversion relationship between the number of pulse signals and the lifting height of the pin, the system can accurately determine the current height of the lifting pin by calculating the total number of pulse signals. The controller sends a command to the motor to move to the target position, while simultaneously monitoring its actual position in real time via the pulse signals fed back from the encoder. If a discrepancy is detected between the actual and target positions, the motor's rotation is immediately adjusted, and it stops as soon as the target position is reached. This ensures that the pin 23 accurately reaches the designated position.

[0036] At the same time, the motor is also equipped with an electromagnetic brake for locking the motor shaft.

[0037] Another equivalent substitution in this embodiment is to replace the worm gear mechanism with a rack and pinion mechanism, replace the driving worm 311 with a rack 331, replace the driven worm gear 312 with a gear 332, and replace the motor with a cylinder or hydraulic cylinder with the ability to extend and retract at the actuator end. The cylinder pushes the rack 331 in the first direction to move it in the horizontal blind hole, thereby driving the gear 332 to rotate under meshing action while simultaneously moving it upwards in the vertical blind hole.

[0038] Similarly, the gear 332 is designed to be thicker, which allows the pin-shaped part 23 to move up and down while also ensuring that the rack 331 and the gear 332 maintain normal meshing.

[0039] It should be noted that the threaded guide groove on the pin-shaped part 23 is always located inside the vertical blind hole.

[0040] Example 3 like Figure 6 Based on Example 1, a sand core box structure specifically designed for inverted shapes is also provided.

[0041] It includes a pin-shaped part 23 and a wedge-shaped linkage mechanism for driving the pin-shaped part 23 to move up and down. The lower box 12 has a stepped guide hole, and the limiting step on the pin-shaped part 23 and the stepped guide hole cooperate to prevent the pin-shaped part 23 from falling off.

[0042] The wedge linkage mechanism includes a wedge 321 and a wedge push rod 322. The wedge 321 is integrally machined on the bottom of the pin-shaped part 23, while the wedge push rod 322 is detachably mounted on the side of the main part 21 by fasteners.

[0043] As the main part 21 is pushed into the core box system, its wedge-shaped push rod 322 contacts and pushes the wedge 321 at the bottom of the pin-shaped part 23 during its movement, thereby converting the horizontal pushing force into a strong vertical lifting force, driving the pin-shaped part 23 to move upward into place. When the mold is opened, simply remove the wedge-shaped push rod 322 and pull out the main part 21, and the pin-shaped part 23 will automatically reset under the action of gravity.

[0044] Preferably, the wedge push rod 322 is designed as a telescopic structure, with its first segment connected to the main part 21, and its second segment used to press the wedge 321. A spring connects the first segment and the second segment, and the two segments are in sliding contact.

[0045] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A coated sand core box structure for machine housing production, characterized in that, include: The basic framework defines an internal shaping space; At least one pluggable main component, said main component being reciprocating relative to the base frame in a first direction; The main component integrates an undercut decoupling component, which includes: A pin-shaped part for forming the undercut structure of the sand core, and movable relative to the main part in a second direction; and A drive assembly for converting an external input into movement of the pin-shaped part in a second direction.

2. The coated sand core box structure for machine casing production according to claim 1, characterized in that, The drive assembly includes: One driving source; A transmission mechanism is provided, which is linked between the drive source and the pin-shaped part.

3. The coated sand core box structure for machine casing production according to claim 2, characterized in that, The driving source is a motor, and the transmission mechanism is a worm gear mechanism, including: The active worm gear, driven by the motor, rotates horizontally within the main component; A driven worm gear is fixed to the tail end of the pin-shaped part; the pin-shaped part is coupled to the main part and can move up and down within the main part. Driven worm gear and driven worm wheel transmission.

4. The coated sand core box structure for machine casing production according to claim 2, characterized in that, The driving source is a cylinder, and the transmission mechanism is a gear and rack mechanism, including: A rack connected to the actuator of the cylinder slides horizontally within the main component; The gear is fixed to the tail of the pin-shaped part, and the pin-shaped part is coupled to the main part and can move up and down in the main part; Gear and rack meshing transmission.

5. A coated sand core box structure for housing production according to claim 3 or 4, characterized in that, A spiral guide groove is formed on the outer peripheral wall of the pin-shaped part, and a guide pin that cooperates with the spiral guide groove is provided in the inner hole of the main part. The guide pin slides in the spiral guide groove.

6. The coated sand core box structure for housing production according to claim 1, characterized in that, The drive assembly includes a wedge-shaped linkage mechanism, comprising: A wedge-shaped push rod that is detachably connected to the main component; A wedge is provided at the bottom of the pin-shaped part, and the wedge surface of the wedge push rod is in contact with the inclined surface of the wedge.

7. A coated sand core box structure for housing production according to claim 6, characterized in that, The wedge-shaped push rod is a telescopic structure.

8. A coated sand core box structure for machine casing production according to claim 6, characterized in that, The basic frame is provided with a stepped guide hole, and the pin-shaped part is slidably installed in the stepped guide hole. The pin-shaped part is provided with a limiting step, and the limiting surface of the limiting step cooperates with the stepped surface of the stepped guide hole.

9. A coated sand core box structure for housing production according to claim 1, characterized in that, The basic framework has several components that can be plugged in and connected to the third-party upwards.

10. A coated sand core box structure for housing production according to claim 1, characterized in that, The basic frame consists of an upper box and a lower box, and at least one sand-shooting channel is provided on the parting surface of the upper box and the lower box.

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