Clamp and sand core transfer system

Abstract

The utility model belongs to the technical field of material transportation, and particularly relates to a clamp and a sand core transfer system. The clamp comprises a fixing frame, a first clamping head and a second clamping head, the first clamping head and the second clamping head are connected with the fixing frame respectively and can move relatively to get close to each other or get away from each other, and a clamping space is formed between the first clamping head and the second clamping head. The side, facing the second chuck, of the first chuck and the side, facing the first chuck, of the second chuck are each provided with a first matching part, the first matching parts are used for being clamped and matched with a sand core, the side, facing the second chuck, of the first chuck and the side, facing the first chuck, of the second chuck are each provided with a second matching part, and the second matching parts are used for being clamped and matched with a base plate. According to the clamp disclosed by the utility model, the sand core and the base plate can be respectively clamped and matched by the clamp, so that the universality and the clamping stability of the clamp are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of material transportation, and in particular relates to a clamp and a sand core transfer system. Background Art

[0002] At present, the diesel engine combined cylinder head blank is usually produced by casting process. Since the molding materials used in sand casting are cheap and easy to obtain, it is the preferred choice for the casting process of combined cylinder head blank. Compared with the single cylinder head, the sand cores used in the casting of combined cylinder head blanks are mostly made into an integral sand core group by the core wrapping process, which has the characteristics of large volume and high weight. During the production process, the assembled integral core group is usually placed on the sand core pallet, transported by roller line, and transported to the intelligent vertical warehouse for transit storage, waiting for the molding core. Among them, the sand core is generally clamped by a clamp, but the existing clamp can only clamp the sand core, and other materials need to use other components, which reduces the versatility of the clamp. Utility Model Content

[0003] The purpose of the utility model is to at least solve the problem of low versatility of existing clamps. This purpose is achieved through the following technical solutions:

[0004] The first aspect of the utility model proposes a clamp, including a fixed frame, a first chuck and a second chuck, the first chuck and the second chuck are respectively connected to the fixed frame and can move relatively to each other so as to be close to or relatively far away from each other, a clamping space is formed between the first chuck and the second chuck, a side of the first chuck facing the second chuck and a side of the second chuck facing the first chuck both have a first matching portion, the first matching portion is used to clamp and cooperate with a sand core, the side of the first chuck facing the second chuck and the side of the second chuck facing the first chuck both have a second matching portion, the second matching portion is used to clamp and cooperate with a pad.

[0005] According to the clamp of the utility model, the fixing frame can fix the first clamp and the second clamp respectively, wherein the first clamp and the second clamp can move relatively to adjust the volume of the clamping space, and are used to clamp materials of different volumes. At the same time, due to the arrangement of the first matching part and the second matching part, the clamp can respectively clamp the sand core and the pad, thereby improving the versatility of the clamp and the stability of clamping.

[0006] In addition, the clamp according to the utility model may also have the following additional technical features:

[0007] In some embodiments of the present invention, the fixed frame includes a frame body, a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are respectively connected to opposite ends of the frame body, the first chuck is rotatably connected to the first connecting portion and can rotate around a first rotation axis, the second chuck is rotatably connected to the second connecting portion and can rotate around a second rotation axis, and the direction of the first rotation axis and the direction of the second rotation axis are both parallel to the arrangement direction from the first chuck to the second chuck.

[0008] In some embodiments of the present invention, the second matching portion includes a first clamping portion and a second clamping portion, a clamping space is formed between the first clamping portion and the second clamping portion, and when the clamp clamps the pad, the pad is clamped in the clamping space.

[0009] In some embodiments of the present invention, the first clamping portion has a first positioning groove, and when the clamp clamps the backing plate, the first positioning groove is clamped and matched with the backing plate.

[0010] The second aspect of the utility model provides a sand core transfer system, which is characterized by comprising:

[0011] Sand core, wherein a plurality of sand cores are provided;

[0012] A clamp, wherein the clamp is the above-mentioned clamp;

[0013] A tray, wherein the fixture can clamp the sand core and move it to the tray, and the tray can accommodate a plurality of the sand cores stacked;

[0014] The backing plate unit comprises a plurality of backing plates, the clamp can clamp the backing plates and move them to the pallet, and the sand cores and the backing plates are alternately arranged along the stacking direction.

[0015] In some embodiments of the utility model, the first side surface and the second side surface of the sand core oppositely arranged along the first direction are both provided with a third matching portion, the first matching portion and the third matching portion are snap-fitted together, and the first direction and the stacking direction are arranged perpendicularly.

[0016] In some embodiments of the utility model, a first positioning portion is provided on one side of the pallet, the sand core has a third side and a fourth side arranged opposite to each other along the stacking direction, the first side, the third side, the second side and the fourth side are connected in sequence, and a second positioning portion is provided on the third side, and when the clamp places the sand core on the pallet, the first positioning portion is snap-fitted with the second positioning portion.

[0017] In some embodiments of the present invention, a third positioning portion is provided on one side of the backing plate, and when the clamp places the sand core on the backing plate, the third positioning portion is snap-fitted with the second positioning portion.

[0018] In some embodiments of the present invention, a fourth positioning portion is provided on the other side of the pad, and when the clamp places the pad on the sand core, the fourth positioning portion is snap-fitted with the third matching portion.

[0019] In some embodiments of the present invention, the pad assembly also includes a base, the base includes a main body and a plurality of limiting parts, the plurality of limiting parts are connected to the same side of the main body and are arranged at intervals around the axis of the main body, and a accommodating space is formed between the plurality of limiting parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0021] Figure 1 The structure diagram of the clamp according to the embodiment of the utility model is schematically shown;

[0022] Figure 2 for Figure 1 Schematic diagram of the matching structure of the middle fixture and the sand core;

[0023] Figure 3 The structure diagram of the sand core transfer system according to the embodiment of the utility model is schematically shown;

[0024] Figure 4 for Figure 3 Schematic diagram of the matching structure of the middle pad, sand core and tray;

[0025] Figure 5 for Figure 4 Schematic diagram of the structure of the medium sand core;

[0026] Figure 6 for Figure 4 Schematic diagram of the structure of the middle tray;

[0027] Figure 7 for Figure 3 A schematic diagram of the structure of the middle pad assembly;

[0028] Figure 8 for Figure 7 Schematic diagram of the structure of the middle pad.

[0029] The reference numerals in the accompanying drawings represent the following:

[0030] 10. Clamp; 11. Fixing frame; 111. Frame body; 112. First connecting portion; 113. Second connecting portion; 12. First clamp; 121. First matching portion; 122. Second matching portion; 1221. First clamping portion; 12211. First positioning groove; 1222. Second clamping portion; 123. Clamping space; 13. Second clamp; 14. Clamping space;

[0031] 20. sand core; 21. third matching portion; 22. second positioning portion;

[0032] 30. tray; 31. first positioning portion;

[0033] 40. Pad assembly; 41. Pad; 411. Third positioning portion; 412. Fourth positioning portion; 421. Main body; 422. Limiting portion. DETAILED DESCRIPTION

[0034] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0036] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0037] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both above and below orientations.

[0038] Figure 1 The schematic diagram of the structure of the clamp according to the embodiment of the utility model is schematically shown. Figure 2 for Figure 1 Schematic diagram of the matching structure of the clamp and the sand core. Figure 1 and 2As shown, the utility model proposes a clamp and a sand core transfer system. The clamp 10 in the utility model includes a fixed frame 11, a first clamp 12 and a second clamp 13, the first clamp 12 and the second clamp 13 are respectively connected to the fixed frame 11 and can move relatively to each other so as to be close to or relatively far away from each other, a clamping space 14 is formed between the first clamp 12 and the second clamp 13, a side of the first clamp 12 facing the second clamp 13 and a side of the second clamp 13 facing the first clamp 12 both have a first matching portion 121, the first matching portion 121 is used for clamping and matching with the sand core 20, the side of the first clamp 12 facing the second clamp 13 and the side of the second clamp 13 facing the first clamp 12 both have a second matching portion 122, the second matching portion 122 is used for clamping and matching with the pad 41. According to the clamp 10 of the utility model, the fixing frame 11 can fix the first chuck 12 and the second chuck 13 respectively, wherein the first chuck 12 and the second chuck 13 can move relatively to adjust the volume of the clamping space 14 for clamping materials of different volumes. At the same time, due to the setting of the first matching portion 121 and the second matching portion 122, the clamp 10 can respectively snap-fit ​​the sand core 20 and the pad 41, thereby improving the versatility of the clamp 10 and the stability of clamping.

[0039] According to the clamp 10 of the utility model, the fixing frame 11 can fix the first chuck 12 and the second chuck 13 respectively, wherein the first chuck 12 and the second chuck 13 can move relatively to adjust the volume of the clamping space 14 for clamping materials of different volumes. At the same time, due to the setting of the first matching portion 121 and the second matching portion 122, the clamp 10 can respectively snap-fit ​​the sand core 20 and the pad 41, thereby improving the versatility of the clamp 10 and the stability of clamping.

[0040] In some embodiments of the present invention, Figure 1 and 2As shown, the fixed frame 11 includes a frame body 111, a first connecting portion 112 and a second connecting portion 113, the first connecting portion 112 and the second connecting portion 113 are respectively connected to opposite ends of the frame body 111, the first clamp 12 is rotatably connected to the first connecting portion 112 and can rotate around a first rotation axis, the second clamp 13 is rotatably connected to the second connecting portion 113 and can rotate around a second rotation axis, and the direction of the first rotation axis and the direction of the second rotation axis are both parallel to the arrangement direction from the first clamp 12 to the second clamp 13. In this embodiment, the frame body 111, the first connecting portion 112 and the second connecting portion 113 are in a U-shaped structure, and there is a accommodating space in the fixed frame 11. The first chuck 12 and the second chuck 13 are respectively located in the accommodating space. The first chuck 12 and the second chuck 13 can move relative to the frame body 111 respectively, and the first chuck 12 can move relative to the second chuck 13 to adjust the volume of the clamping space 14, so as to facilitate the clamping of the sand core 20 and the pad 41 respectively.

[0041] Specifically, in this embodiment, the fixed end of the first chuck 12 is disposed in the first connection portion 112 and can move toward or away from the second chuck 13 , and the fixed end of the second chuck 13 is disposed in the second connection portion 113 and can move toward or away from the first chuck 12 .

[0042] Specifically, in this embodiment, the first chuck 12 can rotate around the first rotation axis, so that the first chuck 12 can change the rotation angle to abut against one side of the sand core 20 or one side of the pad 41. Similarly, the second chuck 13 can rotate around the second rotation axis, so that the second chuck 13 can change the rotation angle to abut against the other side of the sand core 20 or the other side of the pad 41, so that the first chuck 12 and the second chuck 13 can clamp different positions on the opposite sides of the part to be clamped, and different clamping methods are performed according to different clamping positions of the part to be clamped, thereby improving versatility.

[0043] In some embodiments of the present invention, Figure 1 and 2 As shown, the second matching portion 122 includes a first clamping portion 1221 and a second clamping portion 1222, and a clamping space 123 is formed between the first clamping portion 1221 and the second clamping portion 1222. When the clamp 10 clamps the backing plate 41, the backing plate 41 is clamped in the clamping space 123. In this embodiment, the two ends of the backing plate 41 can be clamped in the two clamping spaces 123 respectively, thereby realizing the clamping and transportation of the backing plate 41 by the clamp 10.

[0044] Specifically, in this embodiment, the arrangement direction of the first clamping portion 1221 and the second clamping portion 1222, the stacking direction of the sand core 20 and the direction of the first rotation axis are arranged perpendicular to each other, which means that when clamping the sand core 20 and the clamping pad 41, the first chuck 12 and the second chuck 13 need to rotate in a certain direction, so that there is no mutual interference between the first matching portion 121, the first clamping portion 1221 and the second clamping portion 1222, thereby improving reliability.

[0045] In some embodiments of the present invention, Figure 1 As shown, the first clamping portion 1221 has a first positioning groove 12211. When the clamp 10 clamps the backing plate 41, the first positioning groove 12211 is clamped and matched with the backing plate 41. In this embodiment, the third positioning portion 411 is a raised platform. When the clamp 10 clamps the backing plate 41, the cooperation between the first positioning groove 12211 and the raised platform can further improve the accurate positioning and clamping of the clamp 10 on the backing plate 41, thereby improving the clamping accuracy.

[0046] The utility model also proposes a sand core 20 transfer system, such as Figure 3 As shown, it is characterized by comprising:

[0047] A sand core 20, wherein a plurality of sand cores 20 are provided;

[0048] A clamp 10, the clamp 10 is the clamp 10 mentioned above;

[0049] The tray 30, the fixture 10 can clamp the sand core 20 and move it to the tray 30, and the tray 30 can accommodate a plurality of stacked sand cores 20;

[0050] The backing plate 41 unit includes a plurality of backing plates 41 . The fixture 10 can clamp the backing plates 41 and move them to the pallet 30 . The sand cores 20 and the backing plates 41 are alternately arranged along the stacking direction.

[0051] According to the sand core 20 transfer system of the utility model, the first chuck 12 and the second chuck 13 can move relative to each other, thereby realizing the volume adjustment of the clamping space 14, that is, the pad 41 and the sand core 20 can be clamped and moved respectively, and finally the sand core 20 and the pad 41 are placed on the pallet 30 for easy transportation through the pallet 30, wherein the pallet 30 can accommodate multiple stacked sand cores 20, thereby increasing the transportation quantity of a single pallet 30, and the sand core 20 and the pad 41 are alternately arranged, thereby facilitating the protection of the sand core 20. The sand core 20 transfer system of the utility model realizes the automatic grasping and stacking of the sand core 20 through the clamping unit, thereby improving the utilization rate of the pallet 30, thereby improving the transfer efficiency of the overall core group.

[0052] In some embodiments of the present invention, Figure 4 and5 As shown, the first side surface and the second side surface of the sand core 20 that are arranged opposite to each other along the first direction are both provided with a third matching portion 21, the first matching portion 121 and the third matching portion 21 are snap-fitted, and the first direction and the stacking direction are arranged perpendicularly. In this embodiment, the first matching portion 121 is a protrusion structure, and there are eight protrusion structures. Four protrusion structures are arranged in pairs at both ends of the side of the first chuck 12 facing the second chuck 13, and four protrusion structures are arranged in pairs at both ends of the side of the second chuck 13 facing the first chuck 12. Similarly, the third matching portion 21 is a groove structure, and there are eight groove structures. Four groove structures are arranged in pairs at both ends of the first side surface of the sand core 20 along the first direction, and four groove structures are arranged in pairs at both ends of the second side surface of the sand core 20 along the first direction. Each groove structure is snap-fitted with a protrusion structure. Since the first chuck 12 can move relative to the second chuck 13, it is convenient for the clamp 10 to clamp and transport the sand core 20.

[0053] Specifically, the protruding structure of the first matching portion 121 and the recessed structure of the second matching portion 122 may also be interchangeable, and both can achieve the snap-fitting between the fixture 10 and the sand core 20 .

[0054] In some embodiments of the present invention, Figure 6 As shown, a first positioning portion 31 is provided on one side of the tray 30, and the sand core 20 has a third side surface and a fourth side surface that are arranged opposite to each other along the stacking direction. The first side surface, the third side surface, the second side surface and the fourth side surface are connected in sequence, and a second positioning portion 22 is provided on the third side surface. When the fixture 10 places the sand core 20 on the tray 30, the first positioning portion 31 is engaged with the second positioning portion 22. In this embodiment, the first positioning portion 31 is a boss structure, and there are two boss structures. The second positioning portion 22 is a slot structure, and there are two slot structures. Each slot structure is engaged with a boss structure, which is convenient for the positioning operation when the first sand core 20 is placed on the tray 30.

[0055] Specifically, the protruding structure of the first positioning portion 31 and the groove structure of the second positioning portion 22 can also be interchanged, and both can achieve the clamping and positioning of the tray 30 and the sand core 20 .

[0056] In some embodiments of the present invention, Figure 8 As shown, a third positioning portion 411 is provided on one side of the pad 41. When the fixture 10 places the sand core 20 on the pad 41, the third positioning portion 411 is engaged with the second positioning portion 22. In this embodiment, the third positioning portion 411 is a raised platform, two of which are provided, and the second positioning portion 22 is a groove structure, two of which are provided. Each raised platform is engaged with a groove structure, which can provide positioning and fixation for the stacking of the sand core 20 on the upper side of the pad 41, thereby improving the stability in the stacked state.

[0057] In some embodiments of the present invention, Figure 8 As shown, a fourth positioning portion 412 is provided on the other side of the pad 41. When the clamp 10 places the pad 41 on the sand core 20, the fourth positioning portion 412 is engaged with the third matching portion 21. In this embodiment, the fourth positioning portion 412 is a convex block, and four convex blocks are provided. The second matching portion 122 is a groove structure. The four convex blocks can be engaged with the four groove structures on one side along the stacking direction, thereby providing positioning and fixing for the stacking of the sand core 20 under the pad 41, further improving the stability performance in the stacking state.

[0058] Specifically, along the thickness direction of the pad 41, the third positioning portion 411 and the fourth positioning portion 412 are staggered to prevent interference when there are multiple pads 41. At the same time, the fourth positioning portion 412 can space adjacent pads 41 to facilitate clamping by the clamping unit.

[0059] In some embodiments of the present invention, Figure 7 As shown, the pad assembly 40 also includes a base, which includes a main body 421 and a plurality of limiting parts 422. The plurality of limiting parts 422 are connected to the same side of the main body 421 and are arranged at intervals around the axis of the main body 421, and a receiving space is formed between the plurality of limiting parts 422. In this embodiment, the plurality of limiting parts 422 are used to limit the pad 41 located in the receiving space to prevent the plurality of stacked pads 41 from sliding out of the receiving space.

[0060] In this embodiment, the clamping unit also includes a driving member, which is connected to the fixed frame 11 and can drive the fixed frame 11 to move. The driving member is also connected to the first chuck 12 and the second chuck 13 respectively, and can drive the first chuck 12 to move relative to the second chuck 13, and can also drive the first chuck 12 and the second chuck 13 to rotate along the first rotation axis and the second rotation axis respectively. The driving member can be a structure of a manipulator.

[0061] Furthermore, in the present embodiment, the operating principle of the sand core 20 transfer system is as follows: first, the tray 30 is placed on the track line, and then the driving member drives the fixing frame 11 and the clamp 10 to move to the position of the sand core 20, and the first chuck 12 and the second chuck 13 are relatively far away from each other, so that the sand core 20 is located in the clamping space 14, and then the first chuck 12 and the second chuck 13 are relatively close to each other, so that the first matching part 121 and the third matching part 21 are snap-fitted, thereby completing the clamping of the sand core 20 and transferring it to the tray 30. During the transfer process, the first positioning part 31 and the second positioning part 22 are snap-fitted, thereby completing the placement task of the sand core 20. Then the driving member drives the fixing frame 11 and the clamp 10 to move to the position of the pad 41, and the first chuck 12 and the second chuck 13 are relatively far away, so that one pad 41 is located in the clamping space 14, and then the first chuck 12 and the second chuck 13 move relatively and rotate at the same time, so that the two ends of the pad 41 are respectively located in the two clamping spaces 123, that is, the pad 41 is clamped and transferred to the pallet 30, and during the transportation process, the third matching portion 21 and the fourth positioning portion 412 are clamped and matched, that is, the placement task of the pad 41 on the sand core 20 is completed.

[0062] Then the driving member drives the fixing frame 11 and the clamp 10 to move to the position of the sand core 20, and the first clamp 12 and the second clamp 13 are relatively far away, so that the sand core 20 is located in the clamping space 14, and then the first clamp 12 and the second clamp 13 are relatively close, so that the first matching portion 121 and the third matching portion 21 are engaged, that is, the sand core 20 is clamped and transported to the pad 41 of the tray 30. During the transportation process, the third positioning portion 411 and the third matching portion 21 are engaged, that is, the placement task of the sand core 20 on the pad 41 is completed. By analogy, the tray 30 of the utility model can place an alternating structure of multiple sand cores 20 and multiple pads 41, and finally transported to the next station through the tray 30.

[0063] Specifically, there is a pad 41 surplus detection device in the pad 41 unit. When it is less than 20%, an alarm is issued to prompt the pad 41 to add material. The intervals of all snap-fits in the utility model are set to 1mm. When designing the size of the pad 41, in order to prevent the interference between the clamp 10 and the sand core 20, the two ends of the pad 41 are respectively lengthened by 40mm compared with the two ends of the sand core 20, which are used for grabbing and placing the pad 41 of the clamp 10. Specifically, the strength test of the sand core 20 is used to judge the load-bearing capacity of the sand core 20, and it is recommended that the number of sand cores 20 on each tray 30 is in the range of 2-3.

[0064] In order to meet the needs of mass production of conjoined cylinder head castings, realize the automated and efficient transfer of the integral sand core 20 core group of the conjoined cylinder head, and increase the storage quantity of the sand core 20 in the intelligent vertical warehouse, the utility model designs a sand core 20 transfer system. Without changing the roller line and the size of the pallet 30 and saving costs, by designing a dedicated sand core 20, a pad 41, and a multifunctional fixture 10, the "sand core 20-pad 41-sand core 20" placement steps are performed on the pallet 30, so as to realize the automated grabbing and stacking of multiple conjoined cylinder head sand core 20 core groups, thereby reducing the number of pallets 30 used, improving the utilization rate of the pallet 30, and improving the transfer efficiency of the overall core group.

[0065] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A clamp, characterized in that: The clamp includes a fixed frame, a first chuck and a second chuck, the first chuck and the second chuck are respectively connected to the fixed frame and can move relatively to each other so as to be close to or relatively far away from each other, a clamping space is formed between the first chuck and the second chuck, a side of the first chuck facing the second chuck and a side of the second chuck facing the first chuck both have a first matching portion, the first matching portion is used to clamp and cooperate with the sand core, the side of the first chuck facing the second chuck and the side of the second chuck facing the first chuck both have a second matching portion, the second matching portion is used to clamp and cooperate with the pad.

2. The clamp according to claim 1, characterized in that: The fixing frame includes a frame body, a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion are respectively connected to opposite ends of the frame body, the first chuck is rotatably connected to the first connecting portion and can rotate around a first rotation axis, the second chuck is rotatably connected to the second connecting portion and can rotate around a second rotation axis, and the direction of the first rotation axis and the direction of the second rotation axis are both parallel to the arrangement direction from the first chuck to the second chuck.

3. The clamp according to claim 1, characterized in that: The second matching portion includes a first clamping portion and a second clamping portion, a clamping space is formed between the first clamping portion and the second clamping portion, and when the clamp clamps the pad, the pad is clamped in the clamping space.

4. The clamp according to claim 3, characterized in that: The first clamping portion has a first positioning groove, and when the clamp clamps the backing plate, the first positioning groove is clamped and matched with the backing plate.

5. A sand core transfer system, characterized in that: include: A sand core, wherein a plurality of the sand cores are provided; A clamp, wherein the clamp is the clamp according to any one of claims 1 to 4; A tray, wherein the fixture can clamp the sand core and move it to the tray, and the tray can accommodate a plurality of the sand cores stacked; The backing plate unit comprises a plurality of backing plates, the clamp can clamp the backing plates and move them to the pallet, and the sand cores and the backing plates are alternately arranged along the stacking direction.

6. The sand core transfer system according to claim 5, characterized in that: A first side surface and a second side surface of the sand core that are opposite to each other along a first direction are both provided with a third matching portion, the first matching portion and the third matching portion are snap-fitted together, and the first direction and the stacking direction are perpendicularly arranged.

7. The sand core transfer system according to claim 6, characterized in that: A first positioning portion is provided on one side of the pallet, and the sand core has a third side surface and a fourth side surface that are arranged opposite to each other along the stacking direction. The first side surface, the third side surface, the second side surface and the fourth side surface are connected in sequence, and a second positioning portion is provided on the third side surface. When the clamp places the sand core on the pallet, the first positioning portion is snap-fitted with the second positioning portion.

8. The sand core transfer system according to claim 7, characterized in that: A third positioning portion is provided on one side of the backing plate. When the clamp places the sand core on the backing plate, the third positioning portion is engaged with the second positioning portion.

9. The sand core transfer system according to claim 8, characterized in that: A fourth positioning portion is provided on the other side of the pad, and when the clamp places the pad on the sand core, the fourth positioning portion is snap-fitted with the third matching portion.

10. The sand core transfer system according to claim 5, characterized in that: The pad assembly also includes a base, which includes a main body and a plurality of limiting parts. The plurality of limiting parts are connected to the same side of the main body and are arranged at intervals around the axis of the main body, and a receiving space is formed between the plurality of limiting parts.

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