Device convenient for drawing large casting resin sand molding mold

Abstract

The invention relates to the technical field of casting, in particular to a device convenient for drawing a large casting resin sand molding mold, which is characterized by comprising an annular track arranged on the ground and located below the horizontal plane, and a placing station for placing a mold and a sand box is formed in a surrounding area in the annular track; the positioning assembly is arranged on the annular track in a sliding manner; the mold pressing device comprises a positioning assembly and a pressing assembly arranged on the positioning assembly, the positioning assembly is used for driving the pressing assembly to move to the position above convex lugs on the peripheral side of a mold, and the pressing assembly is used for pressing the convex lugs of the mold downwards to fix the mold. And the whole process is rapid and convenient, the demolding action can be completed only through one-time hoisting, and the production efficiency and the overall modeling quality are improved.

Description

Technical Field

[0001] The invention relates to the technical field of casting, in particular to a demoulding device for a resin sand molding mold for large castings. Background Art

[0002] Resin sand casting is a casting process that uses artificial synthetic resin as a sand binder. The specific process is to mix raw sand with resin, curing agent, etc. in a certain proportion to form resin sand, then carry out molding and core making, fill the resin sand into the mold sand box, and solidify the resin by self-hardening or heating and blowing to make it undergo an irreversible cross-linking reaction, giving the mold or sand core the necessary strength, and then close the box to form a mold and casting cavity, and finally pour the molten metal into the mold, cool and solidify, and get the casting after sand removal.

[0003] At present, in the foundry industry, manual resin sand molding generally adopts special molding molds and special sand boxes, and uses a crane to lift the mold. During the crane lifting process, especially in resin sand molding of medium and large castings, due to its heavy weight, the molding resin sand and the molding mold are tightly adhered, and the molding mold and the special sand box are often connected together and cannot be smoothly demolded. In this way, it is necessary to continuously knock on the four sides of the mold during the lifting and demolding process to assist in demolding, which damages the mold, and the manual knocking of the mold is asymmetrical, which also affects the molding quality and production efficiency.

[0004] Therefore, it is necessary to provide a manual resin sand molding demolding device to meet the production needs of single-piece, small-batch, medium-to-large casting resin sand molding; therefore, it is necessary to improve the existing technology.

[0005] The above information is presented as background information only to assist with understanding the present disclosure and no determination or admission is made as to whether any of the above may be used as prior art with respect to the present disclosure. Summary of the invention

[0006] The invention provides a demoulding device for a resin sand molding mold of a large casting, so as to solve the problems existing in the prior art.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A mold-pulling device for resin sand molding of large castings, comprising:

[0009] The annular track is arranged on the ground and below the horizontal plane, and the inner enclosed area of ​​the annular track forms a placement station for placing the mold and the sand box;

[0010] A positioning assembly, slidably disposed on the annular track;

[0011] And a clamping assembly is arranged on the positioning assembly, the positioning assembly is used to drive the clamping assembly to move above the lugs on the peripheral side of the mold, and the clamping assembly is used to press down the lugs of the mold to fix the mold.

[0012] Preferably, the positioning component includes

[0013] A positioning block, wherein a limiting groove is provided on the positioning block, and the pressing assembly is arranged on the positioning block;

[0014] The top of the annular track has limiting parts protruding toward both sides respectively, and the limiting parts are embedded in the limiting grooves to limit the positioning block from loosening from the annular track.

[0015] Preferably, the pressing assembly comprises:

[0016] A screw, one end of which is threadedly connected to the positioning assembly;

[0017] A cushion block is disposed on the positioning assembly and adjacent to the screw rod;

[0018] And a pressing block, which has a long hole inside for the screw rod to pass through, one end of which is overlapped on the cushion block and the other end is used to overlap on the lug, and the screw rod is used to press down and fix the pressing block.

[0019] Preferably, there are multiple groups of positioning components, and the multiple groups of positioning components are respectively arranged around the annular track.

[0020] Preferably, the positioning assembly is fixed on the annular track by a side screw.

[0021] Preferably, the positioning assembly further includes a guide component, wherein the guide component includes

[0022] Rotate a mounting seat disposed on one side of the positioning block;

[0023] A first guide wheel, rotatably disposed on the mounting seat and rollingly engaged with the inner side of the annular track;

[0024] And a second guide wheel is rotatably arranged on the mounting seat and rollingly cooperates with the outer side of the annular track.

[0025] Preferably, the positioning assembly further includes a guide component, wherein the guide component includes

[0026] A third guide wheel, rotatably disposed on the positioning member, and rollingly engaged with the inner side of the annular track;

[0027] And there are two fourth guide wheels, which are rotatably arranged on the positioning member and form a triangle layout with the third guide wheel. The fourth guide wheel rolls with the outer side of the annular track.

[0028] Preferably, the positioning assembly further includes a displacement component, and the displacement component includes:

[0029] A displacement motor is arranged on the positioning block;

[0030] And a displacement gear is connected to the output shaft of the displacement motor. The annular track is provided with meshing teeth along the length direction, and the displacement gear meshes with the meshing teeth.

[0031] Preferably, the positioning assembly further includes a locking component, and the locking component includes:

[0032] A locking cylinder, fixedly arranged on the positioning block;

[0033] And a locking block is slidably arranged on the positioning block and connected to the telescopic rod of the locking cylinder. The locking block has locking teeth that are engaged with the meshing teeth. The locking cylinder is used to drive the locking block to move closer to or away from the annular track, thereby locking or sliding the positioning block compared to the annular track.

[0034] Preferably, a reinforcement plate buried in the ground is provided at the bottom of the annular track.

[0035] Compared with the prior art, the present invention has the following beneficial effects: the demolding device provided by the present invention is convenient for large-scale casting resin sand molding molds, and can adjust the position of the positioning component on the annular track to press down and reinforce molds of different sizes. At this time, in the process of lifting the product or the resin sand layer, it can provide downward pressure support for the mold, so that the mold and the sand box can be separated smoothly. In this process, there is no need to manually knock the mold multiple times. On the one hand, it solves the problem of damage to the mold caused by multiple manual knocking during demolding. On the other hand, the whole process is quick and convenient, and the demolding action can be completed by only one hoisting. It also overcomes the influence of uneven force caused by manual knocking, which can well optimize production efficiency and promote the improvement of overall molding quality.

[0036] The present invention has other features and advantages, which will be apparent from or will be described in detail in the accompanying drawings and the following detailed description incorporated herein, which together serve to explain the specific principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a structural schematic diagram of the demoulding device in Example 1 of the present application;

[0039] Figure 2 It is a structural schematic diagram of the mold and the sand box in Example 1 of the present application;

[0040] Figure 3 It is a structural schematic diagram of the annular track, the positioning assembly and the clamping assembly in the first embodiment of the present application;

[0041] Figure 4 It is a structural schematic diagram of the demoulding device in the second embodiment of the present application;

[0042] Figure 5 It is a schematic diagram of the structure of the annular track, the positioning assembly and the clamping assembly in the second embodiment of the present application;

[0043] Figure 6 is a schematic diagram of the assembly relationship of the positioning component in the second embodiment of the present application;

[0044] Figure 7 It is a structural schematic diagram of the positioning block and the guide component in Example 3 of the present application.

[0045] Reference numerals:

[0046] 1. Annular track; 11. Reinforcement plate; 12. Limiting part; 13. Meshing teeth;

[0047] 2. Positioning assembly; 21. Positioning block; 211. Limiting groove; 22. Side screw; 23. Displacement component; 231. Displacement gear; 232. Displacement motor; 24. Locking component; 241. Locking cylinder; 242. Locking block;

[0048] 3. Clamping assembly; 31. Screw; 32. Spacer; 33. Pressing block;

[0049] 4. Lugs;

[0050] 5. Guide component; 51. Mounting seat; 52. First guide wheel; 53. Second guide wheel; 54. Third guide wheel; 55. Fourth guide wheel. DETAILED DESCRIPTION

[0051] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In the description of the present invention, it is to be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally disposed component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally disposed component.

[0053] In addition, terms such as "long", "short", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific direction or operate with a specific direction structure, and should not be understood as a limitation of the present invention.

[0054] The following is combined with Figure 1-7 The technical solution of the present invention is further illustrated by specific implementation methods.

[0055] Embodiment 1:

[0056] Please refer to Figure 1 An embodiment of the present invention provides a demolding device for resin sand molding of large castings, including a ring track 1, a positioning component 2 and a clamping component 3.

[0057] The annular track 1 is set on the ground, the positioning assembly 2 is set on the annular track 1, and the clamping assembly 3 is set on the positioning assembly 2. When this solution is applied, the size of the annular track 1 is usually larger than the mold. At this time, the mold and the sand box can be placed in the internal area formed by the annular track 1 by hoisting; because the positioning assembly 2 is slidably set on the annular track 1, the sliding positioning assembly 2 can drive the clamping assembly 3 to move and adjust on the annular track 1. Based on this, the clamping assembly 3 and the positioning assembly 2 are close to the outer peripheral side of the mold, and combined with Figure 2 A lug 4 is usually provided on the side of the mold. The positioning component 2 can drive the clamping component 3 to move above the lug 4 on the side of the mold, and press the lug 4 downward through the clamping component 3 to restrict the vertical movement of the mold and thereby fix it.

[0058] So far, in the above scheme, in the conventional demolding process, it is usually necessary to hoist the sand box and separate the sand box and the mold by knocking the lug 4 downward; however, in the present embodiment, because the clamping assembly 3 has a downward pressing effect, in the process of hoisting the sand box, the mold is equivalent to obtaining a downward limiting pressure, which can make the sand box and the mold separate more smoothly without the need for multiple knocking. The process is convenient and fast, saving time and effort.

[0059] At the same time, it can be understood that due to the differences in the shapes of different castings, the shapes of the corresponding manufacturing molds and the layout of the lugs 4 will also be different. Therefore, by adjusting the position of the positioning component 2 on the annular track 1, it is possible to well adapt to the demolding requirements of molds of different specifications. The structure is flexible to use and has good versatility.

[0060] Furthermore, in order to play a guiding role, the circular track 1 is set in a closed loop elliptical contour in this embodiment. In other embodiments, it can also be set in a circular contour, which is not specifically limited here. In the process of setting the circular track 1, a gully can be set on the ground first, and the circular track 1 can be set inside the gully. At this time, the circular track 1 is set on the ground and is located below the horizontal plane. Because the circular track 1 is set in a closed loop, it can be enclosed on the ground to form a flat area. At this time, the internal enclosed area of ​​the circular track 1 can be used for the placement of molds and sand boxes. For ease of expression, this area is defined as a placement station, and the demolding operation of the mold and sand box is performed at the placement station.

[0061] In addition, refer to Figure 3 In order to improve the installation stability of the circular track 1, a reinforcement plate 11 buried in the ground is provided at the bottom of the circular track 1. Specifically, the reinforcement plate 11 is welded and fixed to the body of the circular track 1, and extends toward opposite sides of the circular track 1 respectively. The reinforcement plate 11 can be pre-buried below the ground by pouring concrete. At this time, the circular track 1 is set horizontally, which can make the circular track 1 more secure when set, and thus can provide sufficient support strength.

[0062] Furthermore, since the annular track 1 needs to withstand the tensile force during the demolding process, in order to optimize the structural strength of the annular track 1, in the present embodiment, the annular track 1 mainly includes a vertical plate and a horizontal plate, wherein the reinforcement plate 11 is fixedly installed at the bottom of the vertical plate, and the horizontal plate is fixedly installed at the top of the vertical plate, forming a structure similar to an I-beam. At this time, the structure of the annular track 1 itself is relatively strong and can withstand greater tensile force.

[0063] On this basis, in order to realize the sliding setting of the positioning component 2, the positioning component 2 in this embodiment mainly includes a positioning block 21, and the positioning block 21 is provided with a limiting groove 211 running through the opposite sides, and the opening contour of the limiting groove 211 is adapted to the top contour of the annular track 1.

[0064] In this embodiment, since the horizontal plate is fixedly installed on the top of the vertical plate, the top of the annular track 1 presents a T-shaped profile structure. At this time, the limiting groove 211 is also set to a T-shaped profile form. By embedding the top of the annular track 1 into the limiting groove 211, and the annular track 1 and the positioning block 21 slide and abut against each other, on the one hand, under the guidance of the annular track 1, the positioning block 21 can slide along the length direction of the annular track 1. On the other hand, at this time, the part of the horizontal plate that protrudes toward both sides compared to the vertical plate forms a limiting portion 12. The limiting portion 12 is embedded in the limiting groove 211, which can limit the positioning block 21 from loosening the annular track 1. At this point, the positioning block 21 can stably slide on the annular track 1, thereby realizing the position adjustment of the positioning component 2.

[0065] Continue to refer to Figure 3 The clamping assembly 3 is arranged on the positioning block 21. Specifically, the clamping assembly 3 includes a screw 31, a cushion block 32 and a pressing block 33. In order to press down the lug 4, the pressing block 33 is first arranged in a strip shape, and then the cushion block 32 is placed on the positioning assembly 2, and one end of the pressing block 33 is overlapped on the cushion block 32, and the other end is overlapped on the lug 4 of the mold.

[0066] At the same time, a long hole is also provided on the pressing block 33, and the long hole extends along the length direction of the pressing block 33. At this time, the screw 31 is vertically arranged and passes through the long hole. At this time, the pad 32 is adjacent to the screw 31. Furthermore, the head of the screw 31 is located at the upper end, and the other end of the screw 31 is threadedly connected to the positioning component 2. Specifically, in this embodiment, a threaded hole can be opened at the top of the positioning block 21, and then one end of the screw 31 is threadedly connected to the threaded hole to achieve the installation of the screw 31.

[0067] Based on the above arrangement, when the lug 4 needs to be fixed, the screw 31 can be rotated to move the screw 31 downward until the head of the screw 31 presses down and fixes the pressure block 33. At this time, the pressure block 33 is supported by the cushion block 32, which is equivalent to forming a lever structure, thereby pressing down the lug 4 of the mold to achieve the purpose of clamping the mold.

[0068] Further, look back Figure 1In order to optimize the overall fixing effect of the mold, the positioning components 2 can be set to multiple groups. The specific number of positioning components 2 should be compatible with the number of lugs 4. For example, in this embodiment, there are four lugs 4 on the mold, so the number of positioning components 2 is also set to four, which are configured one by one at the four lugs 4. At this time, multiple groups of positioning components 2 are respectively arranged around the annular track 1, and provide a multi-directional downward pressure effect, and the fixing effect of the mold is optimized and improved.

[0069] Continue to refer to Figure 3 In order to prevent the positioning component 2 from loosening during the downward positioning process, the positioning component 2 is fixed to the annular track 1 by a side screw 22. Specifically, a transversely arranged threaded hole can be opened on the positioning block 21, and the side screw 22 can be threadedly connected to the threaded hole. At the same time, a positioning hole opposite to the side screw 22 is opened on the annular track 1. By inserting the side screw 22 into the positioning hole, the positioning block 21 is locked, so that the positioning component 2 is not easy to loosen during the downward positioning process, and the structural stability is optimized and improved.

[0070] The implementation principle of this embodiment is: by setting a circular track 1 on the ground, and setting a positioning component 2 and a clamping component 3 on the track, on the one hand, the mold can be fixed on the ground by pressing down, which is conducive to the separation of the sand box and the mold, and is quick and efficient to use. The possibility of damage to the mold caused by manual knocking is reduced, and the molding quality and production efficiency are optimized and improved; on the other hand, according to the mold structure of different shapes and sizes, the position of the positioning component 2 on the circular track 1 can be adjusted to meet the fixing requirements of different molds, which is flexible to use and has strong structural versatility.

[0071] Embodiment 2:

[0072] On the basis of the first embodiment, the features not explained in the present embodiment are explained in the first embodiment and will not be repeated here. The difference between the present embodiment and the first embodiment is that the positioning component 2 is different from the first embodiment, wherein the positioning component 2 in the present embodiment includes not only the positioning block 21 but also the guide component 5.

[0073] Among them, refer to Figure 4 , Figure 5 as well as Figure 6The guide component 5 includes a mounting seat 51, a first guide wheel 52 and a second guide wheel 53, wherein the mounting seat 51 is hinged to the positioning block 21 through a rotating shaft, and the mounting seat 51 is located on one side of the positioning block 21. At this time, the mounting seat 51 can swing compared to the positioning block 21. At the same time, the first guide wheel 52 and the second guide wheel 53 are respectively rotatably installed on the mounting seat 51, and the first guide wheel 52 first rolls with the inner side of the annular track 1, and at the same time, the second guide wheel 53 rolls with the outer side of the annular track 1.

[0074] Under the action of the first guide wheel 52 and the second guide wheel 53, rolling guidance is provided for the positioning component 2, and the mounting seat 51 rotatably arranged on the positioning block 21 can swing at an angle to obtain freedom of movement when encountering arc motion, so that the positioning component 2 can move more smoothly on the annular track 1 with less resistance, and the position adjustment is smoother and more convenient.

[0075] Optionally, there may be two groups of guide components 5 , and the two groups of guide components 5 are respectively arranged on opposite sides of the positioning block 21 along the length direction of the annular track 1 , and the two groups of guide components 5 can further optimize the stability of the positioning assembly 2 during movement.

[0076] Reference Figure 5 and Figure 6 The positioning assembly 2 also includes a displacement component 23, which includes a displacement motor 232 and a displacement gear 231, wherein the displacement motor 232 is fixedly installed on the positioning block 21, and the displacement gear 231 is fixedly installed on the output shaft of the displacement motor 232. At this time, the displacement motor 232 can drive the displacement gear 231 to rotate. At the same time, meshing teeth 13 are opened on the annular track 1 along the length direction, and the displacement gear 231 is meshed with the meshing teeth 13.

[0077] Based on the above structural setting, by starting the displacement motor 232, under the mutual meshing action of the displacement gear 231 and the meshing tooth 13, the positioning component 2 can be pushed to move on the circular track 1. By controlling the torque output direction and angle of the displacement motor 232, the position of the positioning component 2 can be automatically adjusted, which is more convenient and efficient to use. Preferably, the displacement motor 232 can use a servo motor structure to output precise displacement movement.

[0078] In addition, in the present embodiment, the locking method of the positioning assembly 2 and the annular track 1 is different from that of the first embodiment. In the present embodiment, the positioning assembly 2 also includes a locking component 24, and the locking component 24 includes a locking cylinder 241 and a locking block 242, wherein the locking cylinder 241 is fixedly installed on the positioning block 21, and a sliding groove is provided on the positioning block 21 for sliding installation of the locking block 242, and the locking block 242 is connected to the telescopic rod of the locking cylinder 241, and one end of the sliding groove faces the meshing tooth 13, so that one end of the locking block 242 is also opposite to the meshing tooth 13. At the same time, the locking block 242 is integrally connected with a locking tooth that is interlocked with the meshing tooth 13, and the locking cylinder 241 is used to drive the locking block 242 to move closer to or away from the annular track 1.

[0079] On the one hand, when the locking block 242 is close to the annular track 1, the meshing teeth 13 can engage with the locking teeth, thereby locking the positioning block 21 on the annular track 1, so that the positioning assembly 2 is not prone to sliding and deflection during use.

[0080] On the other hand, when the locking block 242 is away from the annular track 1, the meshing teeth 13 can be loosened from the locking teeth, thereby enabling the positioning block 21 to be unlocked relative to the annular track 1, so that the positioning assembly 2 can be adjusted on the annular track 1. Compared with the locking method using the side screw 22 in the first embodiment, the method of locking the positioning assembly 2 using the locking component 24 is more automated and more convenient to use; it can be understood that in the locking scheme adopted in the first embodiment, the side screw 22 can also be understood as another implementation of the locking component 24.

[0081] The implementation principle of this embodiment is: by setting the guide component 5, the positioning component 2 can move more smoothly during adjustment, and under the automatic drive of the displacement component 23 and the locking component 24, the position adjustment action of the positioning component 2 is more automated, and the use is more convenient and accurate.

[0082] Embodiment three:

[0083] Reference Figure 7 The structure of this embodiment is similar to that of the second embodiment, and the difference between the two is that the specific structure of the guide component 5 is different. In this embodiment, the guide component 5 includes a third guide wheel 54 and a fourth guide wheel 55, wherein the number of the fourth guide wheels 55 is set to two, and the third guide wheel 54 and the two fourth guide wheels 55 are respectively rotatably installed at the bottom of the positioning member, and the three are partially arranged in a triangle, wherein the third guide wheel 54 rolls with the inner side of the annular track 1, and the fourth guide wheel 55 rolls with the outer side of the annular track 1.

[0084] Based on the above arrangement, the positioning block 21 can also move smoothly on the arc-shaped annular track 1. Compared with the guide component 5 scheme in the second embodiment, the structure of this scheme is simpler and the manufacturing cost is lower.

[0085] So far, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mold-pulling device for resin sand molding of large castings, characterized in that: include: The annular track (1) is arranged on the ground and below the horizontal plane, and the inner enclosed area of ​​the annular track (1) forms a placement station for placing the mold and the sand box; A positioning assembly (2) slidably disposed on the annular track (1); And a clamping assembly (3) is arranged on the positioning assembly (2), the positioning assembly (2) is used to drive the clamping assembly (3) to move above the lug (4) on the peripheral side of the mold, and the clamping assembly (3) is used to press down the lug (4) of the mold to fix the mold.

2. The demoulding device for resin sand molding of large castings according to claim 1 is characterized in that: The positioning component (2) comprises A positioning block (21), wherein a limiting groove (211) is provided on the positioning block (21), and the pressing assembly (3) is arranged on the positioning block (21); The top of the annular track (1) has limiting portions (12) protruding toward both sides respectively, and the limiting portions (12) are embedded in the limiting groove (211) to limit the positioning block (21) from loosening from the annular track (1).

3. The demoulding device for resin sand molding of large castings according to claim 1 or 2, characterized in that: The pressing assembly (3) comprises: A screw rod (31), one end of which is threadedly connected to the positioning assembly (2); A cushion block (32) is arranged on the positioning assembly (2) and is arranged adjacent to the screw rod (31); and a pressing block (33) having a long hole inside for the screw rod (31) to pass through, one end of which is overlapped on the cushion block (32) and the other end of which is used to overlap on the lug (4), and the screw rod (31) is used to press down and fix the pressing block (33).

4. The demoulding device for large-scale casting resin sand molding mold according to claim 1 or 2, characterized in that: The positioning components (2) are multiple groups, and the multiple groups of positioning components (2) are respectively arranged around the annular track (1).

5. The demoulding device for resin sand molding of large castings according to claim 1 or 2, characterized in that: The positioning assembly (2) is fixedly arranged on the annular track (1) via a side screw (22).

6. The demoulding device for resin sand molding of large castings according to claim 2 is characterized in that: The positioning assembly (2) further comprises a guide component (5), wherein the guide component (5) comprises: Rotating a mounting seat (51) disposed on one side of the positioning block (21); A first guide wheel (52) is rotatably mounted on the mounting seat (51) and is in rolling engagement with the inner side of the annular track (1); and a second guide wheel (53) which is rotatably mounted on the mounting seat (51) and is in rolling engagement with the outer side of the annular track (1).

7. The demoulding device for resin sand molding of large castings according to claim 2 is characterized in that: The positioning assembly (2) further comprises a guide component (5), wherein the guide component (5) comprises A third guide wheel (54) is rotatably disposed on the positioning member and is in rolling engagement with the inner side of the annular track (1); and fourth guide wheels (55), two in number, rotatably arranged on the positioning member and forming a triangular layout with the third guide wheel (54), wherein the fourth guide wheels (55) are in rolling cooperation with the outer side of the annular track (1).

8. The demoulding device for resin sand molding of large castings according to claim 2, 6 or 7, characterized in that: The positioning assembly (2) further comprises a displacement component (23), wherein the displacement component (23) comprises: A displacement motor (232) is arranged on the positioning block (21); and a displacement gear (231) connected to the output shaft of the displacement motor (232); meshing teeth (13) are provided on the annular track (1) along the length direction; and the displacement gear (231) meshes with the meshing teeth (13).

9. The demoulding device for resin sand molding of large castings according to claim 8, characterized in that: The positioning assembly (2) further comprises a locking component (24), wherein the locking component (24) comprises: A locking cylinder (241) fixedly disposed on the positioning block (21); and a locking block (242) slidably disposed on the positioning block (21) and connected to the telescopic rod of the locking cylinder (241); the locking block (242) has locking teeth that engage with the meshing teeth (13); the locking cylinder (241) is used to drive the locking block (242) to move closer to or farther from the annular track (1), thereby causing the positioning block (21) to lock or slide relative to the annular track (1).

10. The demoulding device for resin sand molding of large castings according to claim 1, characterized in that: The bottom of the annular track (1) is provided with a reinforcing plate (11) buried in the ground.

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