Sand pressing head sealing structure

Abstract

A sand pressing head sealing structure comprises a hollow cylindrical sand pressing head with the lower end face open, the upper end face of the sand pressing head is fixedly connected with a hydraulic oil cylinder connecting device, and a hydraulic oil cylinder drives the sand pressing head to vertically and linearly move through the hydraulic oil cylinder connecting device. A sealing device for sealing the sand pressing head and the sand cylinder is arranged on the lower end surface of the base; an air inlet is formed in the side surface of the sand pressing head. The utility model provides a sand pressing head sealing structure which can effectively solve the potential safety hazard that when a sealing ring is replaced, the sealing ring is too tight and difficult to take out, and the sealing ring is too loose and easy to fall off, so that sand in a sand cylinder leaks out.

Description

Technical Field

[0001] This utility model relates to the field of shell core making machines, and in particular to a sand pressing head sealing structure. Background Technology

[0002] Currently, the core-making machine is a device that uses the hot core box process to produce coated sand cores. Its working process involves filling and compacting sand simultaneously. The coated sand solidifies in the hot core box, reducing labor intensity, making operation flexible, convenient, and easy to master. It uses electric heating, and the temperature can be automatically controlled. The work area is easy to keep clean, creating conditions for the mechanization and automation of the core-making process. One cycle only takes a few tens of seconds to produce sand cores for casting.

[0003] A search revealed that invention patent document CN107243605B discloses a sand-shooting device and a method for producing coated sand cores using this sand-shooting device. The sand-shooting device includes a blower plate, a hose, and a sand-shooting connector. The blower plate has a mounting portion for mounting onto a core-making machine, a notch for connecting with the sand outlet of the core-making machine, and a first hole communicating with the notch. One end of the hose is connected to the first hole, and the other end is connected to the sand-shooting connector. The sand-shooting connector has a second hole connected to the hose and a sand-shooting hole communicating with the second hole. The sand-shooting hole is used to align with the sand inlet hole on a sand core mold placed on the ground. The bottom surface of the sand-shooting connector has a recessed groove surrounding the sand-shooting hole, and a sealing ring is provided in the groove to seal the gap between the sand-shooting connector and the sand core mold. The sand-shooting device is used to transport air pressure and coated sand from the core-making machine to the sand core mold.

[0004] However, the above technology still has some shortcomings in use: the top surface of the blow plate is recessed around the notch, and a sealing ring for sealing the blow plate and the shell core machine is installed in the mounting groove. The sealing ring is squeezed and clamped into the groove. If it is too tight, it will make replacement extremely inconvenient; if it is too loose, the sealing ring will fall off, which is also very inconvenient. Utility Model Content

[0005] The purpose of this utility model is to provide a sand-pressing head sealing structure that can effectively solve the safety hazards of sand leakage from the sand cylinder when replacing the sealing ring, which is difficult to remove if the sealing ring is too tight or easy to fall off if the sealing ring is too loose.

[0006] The present invention adopts the following technical solution: a sand-pressing head sealing structure, comprising a hollow cylindrical sand-pressing head with an open lower end face, a hydraulic cylinder connecting device fixedly connected to the upper end face of the sand-pressing head, the hydraulic cylinder driving the sand-pressing head to move vertically and linearly through the hydraulic cylinder connecting device, a hollow base fixedly connected to the lower end face of the sand-pressing head, a sealing device for sealing the sand-pressing head and the sand cylinder on the lower end face of the base, and an air inlet on the side of the sand-pressing head.

[0007] The sealing device includes a sealing part fixing seat, a sealing part fixing cover, and a sealing part; the sealing part fixing seat has several through holes in the middle, and a fixing part extending downward is provided on the bottom surface of the sealing part fixing seat outside the several through holes; the sealing part adopts a sealing ring, and the sealing part is sleeved on the outside of the fixing part; the sealing part fixing cover is a ring-shaped fixing cover, which is sleeved on the outside of the sealing part and detachably connected to the sealing part fixing seat.

[0008] The fixing part adopts a downwardly extending ring-shaped flange, and the sealing ring adopts a sealing ring that is compatible with the ring-shaped flange.

[0009] The longitudinal section of the ring-shaped flange is trapezoidal, and the inner ring of the sealing ring is provided with a trapezoidal part that matches the ring-shaped flange.

[0010] The longitudinal section of the sealing ring is trapezoidal.

[0011] The lower end face of the sealing part fixing seat has several threaded holes arranged circumferentially, and the sealing part fixing cover is provided with several threaded through holes accordingly; the sealing part fixing cover is connected to the sealing part fixing seat by bolts through the threaded holes and threaded through holes.

[0012] A stepped receiving groove is provided on the top surface of the sealing part fixing seat outside several through holes, and a screen is installed in the receiving groove.

[0013] The base and the sealing device are connected by a clamp device, which includes two arc-shaped clamps, a bolt and a sealing ring. The outer side of the base and the sealing part fixing seat are both provided with grooves along the circumference. The inner side of the clamp is provided with two annular protrusions along the circumference, and a placement groove is formed between the two annular protrusions. The sealing ring is fixedly placed in the placement groove. The two annular protrusions are placed in the corresponding grooves of the base and the sealing part fixing seat. The bolt is provided with an anti-loosening nut at the end.

[0014] The sealing ring is made of a flexible sealing material.

[0015] The hydraulic cylinder connection device is a convex cylinder with a threaded hole at the center of the upper end face for connecting the hydraulic cylinder actuator, and a sand press head is fixedly connected to the lower end face.

[0016] The sealing device of this utility model includes a sealing part fixing seat, a sealing part fixing cover, and a sealing part. The sealing part fixing seat has several through holes in its center, and a downwardly extending fixing part is located on the bottom surface of the sealing part fixing seat outside the several through holes. The sealing part is a sealing ring, and is fitted over the fixing part. The sealing part fixing cover is a ring-shaped fixing cover, fitted over the sealing part and detachably connected to the sealing part fixing seat. This effectively prevents the sealing part from becoming too tight or too loose, and also allows for timely disassembly and replacement of the sealing part for convenient maintenance.

[0017] Furthermore, the sealing part of this invention features a stepped receiving groove on the top surface of the fixing seat, located outside several through holes, with a screen inside the receiving groove. This prevents sand from flowing back into the sand cylinder, i.e., sand returning to the cavity of the sand pressing head through the through holes.

[0018] Furthermore, the base and sealing device of this utility model are connected by a clamp device, which is convenient to use, allows for quick installation or disassembly of the sealing device, and provides good sealing performance.

[0019] This utility model provides a sand-pressing head sealing structure, which can effectively solve the safety hazards of sand leakage from the sand cylinder caused by the sealing ring being too tight and difficult to remove, or too loose and easy to fall off during installation. Attached Figure Description

[0020] Figure 1 A schematic diagram of the assembly of the sand pressing head and the sand cylinder;

[0021] Figure 2 This is a schematic diagram of the sand-pressing head.

[0022] Figure 3 This is a schematic diagram of the explosive structure of the sand-pressing head;

[0023] Figure 4 This is a schematic diagram of the structure of the sealing part fixing seat in this utility model;

[0024] Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure at point A;

[0025] Figure 6 This is a schematic diagram of the clamp structure in this utility model;

[0026] Figure 7 This is a schematic diagram of the sealing ring structure in this utility model;

[0027] Figure 8 This is a schematic diagram of the assembly structure of the sand pressing head, sand cylinder, sand storage funnel, and sand shooting plate.

[0028] In the diagram, 1. Sand press head; 2. Sand cylinder; 3. Hydraulic cylinder; 4. Convex cylinder; 5. Air inlet; 6. Base; 7. Screen; 8. Sealing part fixing seat; 9. Groove; 10. Sealing part fixing cover; 11. Sealing part; 12. Fixing part; 13. Through hole; 14. Clamp; 15. Bolt; 16. Nut; 17. Placement groove; 18. Receiving groove; 19. Sealing ring; 20. Guide rail; 21. Sand storage funnel; 22. Sand shooting plate. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0030] like Figure 1-8 As shown, the sand-pressing head sealing structure of this utility model includes a hollow cylindrical sand-pressing head 1 with an open lower end face. A hydraulic cylinder connecting device is fixedly connected to the upper end face of the sand-pressing head 1. The hydraulic cylinder drives the sand-pressing head 1 body to move vertically and linearly through the hydraulic cylinder connecting device. A hollow base 6 is fixedly connected to the lower end face of the sand-pressing head 1. A sealing device for sealing the sand-pressing head 1 and the sand cylinder 2 is provided on the lower end face of the base 6. An air inlet 5 is opened on the side of the sand-pressing head.

[0031] Figure 8 As shown, the sand cylinder 2 with its open top and bottom moves left and right on the guide rail 20, while simultaneously driving the sand storage funnel 21 and the sand shooting plate 22. The sand cylinder 2 reaches the designated location to fill with sand. After the sand cylinder 2 and the sand storage funnel 21 have finished filling with sand, they return to the area directly below the sand pressing head 1. The sand pressing head 1 moves downward by connecting to the hydraulic cylinder 3 via the hydraulic cylinder connecting device. The sealing device and the upper end face of the sand cylinder 2 achieve air pressure sealing by compression. Air pressure enters from the air inlet 5 into the inner cavity of the sand pressing head 1, and then transmits the air pressure to the sand cylinder 2 and the sand storage funnel 21, achieving the effect of sand being shot from the sand shooting plate 22. When sand shooting is completed and sand filling is required again, the air pressure supply is turned off. After the hydraulic cylinder 3 drives the sand pressing head 1 to move upward, the sand cylinder 2 moves again to the designated position on the guide rail 20 to fill with sand.

[0032] In the prior art, the sealing ring is placed in the sealing ring fixing part by compression. If it is too tight, it will be difficult to replace; if it is too loose, the sealing ring of the sand pressing head 1 will fall off when the core machine is working, causing a large amount of sand to leak out of the sand cylinder 2, which is very inconvenient. The core machine is prior art and will not be described in detail here. In this embodiment, the sealing device includes a sealing part fixing seat 8, a sealing part fixing cover 10, and a sealing part 11. The sealing part fixing seat 8 is provided with several through holes 13 in the middle for gas to pass through, and a fixing part 12 extending downward is provided on the bottom surface of the sealing part fixing seat 8 outside the several through holes 13; the sealing part 11 adopts a sealing ring, and the sealing part 11 is sleeved on the outside of the fixing part 12; the sealing part fixing cover 10 is a ring-shaped fixing cover, which is sleeved on the outside of the sealing part 11 and is detachably connected to the sealing part fixing seat 8.

[0033] In this embodiment, the fixing part 12 may be a downwardly extending annular flange, and the sealing ring may be a sealing ring adapted to the annular flange.

[0034] In order to improve the stability of the connection between the sealing part 11 and the fixing part 12 and prevent them from falling off, in this embodiment, the longitudinal section of the annular protrusion is trapezoidal, and the inner ring of the sealing ring is provided with a trapezoidal placement part that matches the annular protrusion.

[0035] In order to further increase the contact area between the sealing ring and the upper end face of the sand cylinder 2, and to prevent the sealing ring from being misaligned with the air inlet of the upper end face of the sand cylinder 2, resulting in sealing failure, in this embodiment, the longitudinal section of the sealing ring is trapezoidal, which can expand the contact area between the lower end face of the sealing ring and the upper end face of the sand cylinder 2.

[0036] In this embodiment, the lower end face of the sealing part fixing seat 8 has several threaded holes arranged circumferentially, and the sealing part fixing cover 10 is correspondingly provided with several threaded through holes. The sealing part fixing cover 10 is connected to the sealing part fixing seat 8 by bolts through the threaded holes and threaded through holes. The connection method of the sealing part fixing seat 8, the sealing part fixing cover 10 and the sealing part 11 can effectively prevent the sealing part 11 from being too tight or too loose, and can also be easily disassembled and replaced for maintenance.

[0037] In this embodiment, a stepped receiving groove 18 is provided on the top surface of the sealing part fixing seat 8 outside several through holes 13, and a screen 7 is provided in the receiving groove 18. After the hydraulic cylinder 3 drives the sand pressing head 1 to move downward and make contact with the upper end face of the sand cylinder 2, air pressure enters from the air inlet 5, passes through the screen 7 and the through holes 13 in sequence, enters the sand cylinder 2, and then enters the sand storage funnel 21 to achieve the effect of sand shooting. After the air inlet 5 stops, in order to prevent the sand in the sand cylinder 2 from flowing back, that is, the sand returns to the cavity of the sand pressing head 1 through the through holes 13, the screen 7 placed on the upper end face of the sealing part fixing seat 8 plays a role in preventing the sand from returning to the cavity of the sand pressing head 1. Since the screen 7 can be detachably placed on the upper end face of the receiving groove 18, the screen 7 may become clogged with sand after working for a period of time. The screen 7 can be removed in time for cleaning and reuse.

[0038] In this embodiment, the base 6 is connected to the sealing device using a clamp device. The clamp device includes two arc-shaped clamps 14, bolts 15, and a sealing ring 19. Grooves 9 are formed along the circumference on the outer surfaces of both the base 6 and the sealing part fixing seat 8. Two annular protrusions are horizontally arranged along the circumference on the inner surfaces of the clamps 14, forming a placement groove 17 between them. The sealing ring is fixedly placed in the placement groove 17. The two annular protrusions are positioned within the corresponding grooves 9 of the base 6 and the sealing part fixing seat 8, creating a positioning effect. The ends of the left and right clamps 14 are connected by bolts. The sealing ring 19 in the placement groove 17 is correspondingly positioned at the connection between the base 6 and the sealing part fixing seat 8, forming a sealing effect at the connection point. The clamp device also has the advantage of easy and quick installation and removal, and the sealing ring 19 enhances the sealing performance.

[0039] In this embodiment, the sealing ring 19 is made of flexible sealing material. Flexible sealing material can better adapt to various irregular surfaces, fill gaps, achieve effective sealing effect, and is convenient and inexpensive to use.

[0040] In this embodiment, in order to prevent the bolt 15 from falling off, an anti-loosening nut 16 is provided at the tail of the bolt 15.

[0041] In this embodiment, the hydraulic cylinder connecting device is a convex cylinder 4. A threaded hole is opened at the center of the upper end face for connecting the actuating end of the hydraulic cylinder 3. The lower end face is fixedly connected to the sand pressing head 1. The hydraulic cylinder 3 drives the sand pressing head 1 to move vertically up and down, so that the sand pressing head 1 and the sand cylinder 2 achieve a sealing effect by extrusion.

[0042] This utility model provides a sand-pressing head sealing structure, which can effectively solve the safety hazards of sand leakage from the sand cylinder caused by the sealing ring being too tight and difficult to remove, or too loose and easy to fall off during installation.

Claims

1. A sand-pressing head sealing structure, characterized in that: It includes a hollow cylindrical sand pressing head with an open lower end face. A hydraulic cylinder connecting device is fixedly connected to the upper end face of the sand pressing head. The hydraulic cylinder drives the sand pressing head to move vertically and linearly through the hydraulic cylinder connecting device. A hollow base is fixedly connected to the lower end face of the sand pressing head. A sealing device is provided on the lower end face of the base to achieve a seal between the sand pressing head and the sand cylinder. An air inlet is opened on the side of the sand pressing head.

2. The sand-pressing head sealing structure according to claim 1, characterized in that: The sealing device includes a sealing part fixing seat, a sealing part fixing cover, and a sealing part; the sealing part fixing seat has several through holes in the middle, and a fixing part extending downward is provided on the bottom surface of the sealing part fixing seat outside the several through holes; the sealing part adopts a sealing ring, and the sealing part is sleeved on the outside of the fixing part; the sealing part fixing cover is a ring-shaped fixing cover, which is sleeved on the outside of the sealing part and detachably connected to the sealing part fixing seat.

3. The sand-pressing head sealing structure according to claim 2, characterized in that: The fixing part adopts a downwardly extending ring-shaped flange, and the sealing ring adopts a sealing ring that is compatible with the ring-shaped flange.

4. The sand-pressing head sealing structure according to claim 3, characterized in that: The longitudinal section of the ring-shaped flange is trapezoidal, and the inner ring of the sealing ring is provided with a trapezoidal part that matches the ring-shaped flange.

5. The sand-pressing head sealing structure according to claim 2, characterized in that: The longitudinal section of the sealing ring is trapezoidal.

6. The sand-pressing head sealing structure according to claim 2, characterized in that: The lower end face of the sealing part fixing seat has several threaded holes arranged circumferentially, and the sealing part fixing cover is provided with several threaded through holes accordingly; the sealing part fixing cover is connected to the sealing part fixing seat by bolts through the threaded holes and threaded through holes.

7. The sand-pressing head sealing structure according to claim 2, characterized in that: A stepped receiving groove is provided on the top surface of the sealing part fixing seat outside several through holes, and a screen is installed in the receiving groove.

8. The sand-pressing head sealing structure according to claim 1, characterized in that: The base and the sealing device are connected by a clamp device, which includes two arc-shaped clamps, a bolt and a sealing ring. The outer side of the base and the sealing part fixing seat are both provided with grooves along the circumference. The inner side of the clamp is provided with two annular protrusions along the circumference, and a placement groove is formed between the two annular protrusions. The sealing ring is fixedly placed in the placement groove. The two annular protrusions are placed in the corresponding grooves of the base and the sealing part fixing seat. The bolt is provided with an anti-loosening nut at the end.

9. The sand-pressing head sealing structure according to claim 8, characterized in that: The sealing ring is made of a flexible sealing material.

10. The sand-pressing head sealing structure according to claim 1, characterized in that: The hydraulic cylinder connection device is a convex cylinder with a threaded hole at the center of the upper end face for connecting the hydraulic cylinder actuator, and a sand press head is fixedly connected to the lower end face.

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