Multi-sand-core assembling jig

Abstract

The invention discloses a multi-sand-core assembling jig, and relates to the technical field of sand core assembling equipment, the multi-sand-core assembling jig comprises an assembling table, sand cores are placed at the top end of the assembling table, a rotating main rod is fixedly connected to one side of the assembling table, and a rotating auxiliary rod is movably connected to the inner wall of the rotating main rod in a clamped mode; the device comprises a rotating main rod, a transverse rod is fixedly connected to the outer wall of the top end of the rotating main rod, a transverse rack is fixedly connected to the top end of the transverse rod, a device body is installed on the outer wall of the transverse rod and the outer wall of the transverse rack, and pull-back grooves are formed in the positions, located on the transverse rod and the transverse rack, of the device body. By means of the structure, when the dispensing valve or the electric grinding machine is pulled, deflection can occur, so that the pulled end is close to the corresponding triggering mechanism, the corresponding processing device falls down, automatic return stroke can be achieved when the device is not used, and the sand core assembling operation cannot be affected.

Description

Technical Field

[0001] The invention relates to the technical field of sand core assembly equipment, and in particular to a jig for assembling multiple sand cores. Background Art

[0002] The multi-core assembly jig is a tool specially designed to assemble multiple sand cores in a specific order and position. Its main functions include positioning, fixing and assembling sand cores to ensure that the sand cores can maintain the correct position and shape during the pouring process;

[0003] However, during the assembly in the prior art, the following problems exist: 1. During the assembly, some sand cores cannot be assembled due to the burrs on some sand cores; 2. During the assembly, they are prone to loosening and falling off; both of which greatly affect the assembly of the sand cores and affect the quality of the products cast later. However, the burr treatment method adopted in the prior art adopts a pre-treatment method, that is, a special person performs burr treatment before the sand cores are assembled, but in actual use, there is still a problem that some burrs are not cleanly processed. Secondly, during the assembly, the gluing method is not convenient enough. Therefore, the present invention provides a plurality of sand core assembly jigs. Summary of the invention

[0004] In view of the above existing problems, the present invention is proposed.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A plurality of sand core assembly jigs, comprising an assembly table, a sand core is placed on the top of the assembly table, a rotating main rod is fixedly connected to one side of the assembly table, a rotating secondary rod is movably connected to the inner wall of the rotating main rod, a transverse rod is fixedly connected to the outer wall of the top of the rotating main rod, a transverse rack is fixedly connected to the top of the transverse rod, a device body is installed on the outer walls of the transverse rod and the transverse rack, a pull-back groove is opened at the transverse rod and the transverse rack of the device body, a mechanism component is installed in the device body, the mechanism component comprises a main body hollow rod, a glue spraying trigger end and a grinding trigger end are respectively fixedly connected on both sides of the main body hollow rod, the main body hollow rod is located on a side away from the rotating main rod and is fixedly connected to the glue spraying trigger end, the main body The grinding trigger end is fixedly connected to one side of the hollow rod close to the rotating main rod, and the transmission end is fixedly connected to the middle part of the outer wall of the main hollow rod, and an internal fixing rod is installed on the inner wall of the main hollow rod. A first torsion spring and a second torsion spring are installed between the internal fixing rod and the inner wall of the main hollow rod, one end of the first torsion spring is fixedly connected to the glue spraying trigger end, and the other end of the first torsion spring is fixedly connected to the middle part of the internal fixing rod, one end of the second torsion spring is fixedly connected to the grinding trigger end, and the other end of the second torsion spring is fixedly connected to the middle part of the internal fixing rod, and the gap between the internal fixing rod and the inner wall of the main hollow rod is larger than the cross-sectional diameter of the first torsion spring or the second torsion spring, and lowering ropes are respectively wound on both sides of the transmission end of the main hollow rod. One end of the lowering rope is fixedly connected to the middle part of the outer wall of the main body hollow rod, the lowering rope located on the side of the glue spraying trigger end is fixedly connected to the glue spraying rope, the bottom end of the glue spraying rope is fixedly connected to the glue dispensing valve, the lowering rope located on the side of the grinding trigger end is fixedly connected to the grinding rope, the bottom end of the grinding rope is fixedly connected to an electric grinder, a transmission motor is provided on one side of the transmission end inside the device body, the output shaft of the transmission motor is transmission-connected to the transmission end through a belt, a receiving groove for the main body hollow rod is provided in the device body, a transmission groove is provided at the transmission end, a first trigger groove is provided at the receiving groove of the device body at the glue spraying trigger end, and a receiving groove of the device body is provided at the grinding trigger end A second trigger groove is provided at the end, a rope pulling groove is provided at the position of the lowering rope located near the glue spraying trigger end and away from the transmission motor, the glue spraying rope passes through the rope pulling groove and is connected with the lowering rope, the holding groove of the device body is symmetrically provided with another rope pulling groove with the main body hollow rod as the center, the other rope pulling groove is connected with the grinding rope, the device body is provided with a pulling back tooth groove at the top of the pulling back groove, a pulling back gear is installed in the pulling back tooth groove, through such an arrangement, during operation, the glue dispensing valve and the electric grinder can reach any position above the workbench under the action of rotating the auxiliary rod and the pulling back gear, the device body is movable on the transverse rod and the transverse rack through the pulling back gear,The top of the outer wall of the device body is located on a side close to the rotating main rod and is fixedly connected with one end of a pull-back spring, and the other end of the pull-back spring is fixedly connected to the top of the rotating secondary rod, and the device body is also provided with a fixing groove, and the fixing groove is fixedly connected to the inner fixing rod, and a first lowering groove is provided on one side of the first trigger groove, and a first pressing switch is fixedly connected to the bottom end of the first lowering groove, and a first elastic sheet is fixedly connected to the inner wall of the first lowering groove, and the first elastic sheet does not contact the main hollow rod under normal circumstances, and the first elastic sheet is in a downward state when in contact with the main hollow rod, and the first pressing switch is used to control the transmission motor to reverse, and a second lowering groove is provided at the second trigger groove, and the second lowering groove and the first lowering groove are centrally symmetrically arranged with the main hollow rod as the center, and the bottom end of the second lowering groove is fixedly connected to There is a second push switch, and the inner side wall of the second lowering groove is fixedly connected with a second spring sheet. The second spring sheet does not contact the grinding trigger end under normal conditions. When the second spring sheet contacts the main hollow rod, it is in a downward pressure state. The second push switch is used to control the transmission motor to rotate forward. When the first push switch and the second push switch control the transmission motor to rotate forward and reverse, the control time is 1s. The dispensing valve is used to assemble multiple sand cores. When the sand cores need to be combined with adhesive, the dispensing valve is pulled to control the dispensing valve to spray the adhesive. When the assembly is carried out, due to the problem of burrs, it cannot be installed. At this time, the electric grinder is pulled and the electric grinder is turned on to grind the sand cores that need to be trimmed. The dispensing valve is connected to a special glue injection machine through a glue injection tube, and a push switch is set on it. ,

[0007] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0008] 1. The present invention arranges the first spring piece and the second spring piece so that no matter when the dispensing valve or the electric grinder is pulled, deflection can occur, thereby causing the pulled end to approach the corresponding trigger mechanism, causing the corresponding processing device to fall, and automatically return when not in use, without affecting the sand core assembly operation.

[0009] 2. The present invention uses the pull-back groove and the pull-back gear and the pull-back spring to effectively fix the device body. At the same time, it is equivalent to providing a horizontal axis when using the dispensing valve and the electric grinder. With the pull rope groove, the glue spray rope and the grinding rope, the operation range covers the entire assembly table. At the same time, after the operation is completed, the pull-back spring can also pull back the device body, which will not affect the subsequent sand core assembly operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0012] Figure 2 It is a schematic diagram of the overall structure decomposition of the present invention;

[0013] Figure 3 It is a schematic diagram of the main structure of the device of the present invention;

[0014] Figure 4 It is a schematic diagram of the main structure of the device of the present invention;

[0015] Figure 5 Schematic diagram of the structure of the mechanism components of the present invention

[0016] Figure 6 It is a schematic diagram of the decomposed structure of the mechanism components of the present invention;

[0017] Figure 7 It is a schematic diagram of the cross-sectional side view of the main body of the device of the present invention;

[0018] Figure 8 It is a schematic cross-sectional structure diagram of the first trigger groove of the device body of the present invention;

[0019] Fig. 9 It is a schematic cross-sectional structure diagram of the first trigger groove of the device body of the present invention;

[0020] Fig.10 It is a schematic diagram of the cross-sectional structure of the second trigger groove of the device body of the present invention;

[0021] Fig.11 For the present invention Fig. 9 Enlarged schematic diagram of the structure at B.

[0022] Description of reference numerals:

[0023] 1. Assembly table; 2. Sand core to be assembled; 3. Rotating main rod; 301. Rotating auxiliary rod; 4. Transverse rod; 401. Transverse rack; 5. Device body; 501. Pull-back spring; 502. Pull-back groove; 5021. First trigger groove; 5022. First lowering groove; 5023. First push switch; 5024. First spring piece; 503. Second trigger groove; 5031. Second lowering groove; 5032. Second push switch; 5033. Second spring piece; 504. Transmission slot; 505, rope slot; 506, fixing slot; 507, pull-back gear; 5071, pull-back tooth slot; 6, mechanism assembly; 601, main hollow rod; 602, glue spraying trigger end; 603, grinding trigger end; 604, transmission end; 605, lowering rope; 6051, glue spraying rope; 6052, grinding rope; 606, first torsion spring; 6061, second torsion spring; 607, internal fixing rod; 608, transmission motor; 7, glue dispensing valve; 8, electric grinder. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] The embodiment of the present invention discloses a jig for assembling multiple sand cores.

[0026] The present invention provides Figure 1-11The illustrated multiple sand core assembly jig comprises an assembly table 1, a sand core 2 to be assembled is placed on the top of the assembly table 1, a rotating main rod 3 is fixedly connected to one side of the assembly table 1, a rotating secondary rod 301 is movably connected to the inner wall of the rotating main rod 3, a transverse rod 4 is fixedly connected to the top outer wall of the rotating main rod 3, a transverse rack 401 is fixedly connected to the top of the transverse rod 4, a device body 5 is installed on the outer wall of the transverse rod 4 and the transverse rack 401, a pull-back groove 502 is opened at the transverse rod 4 and the transverse rack 401 of the device body 5, a mechanism component 6 is installed in the device body 5, the mechanism component 6 comprises a main hollow rod 601, and a spray trigger end 602 and a grinding trigger end 603 are fixedly connected to the two sides of the main hollow rod 601, respectively. The main hollow rod 601 is located on a side away from the rotating main rod 3 and is fixedly connected to the glue spraying trigger end 602. The main hollow rod 601 is close to the rotating main rod 3 and is fixedly connected to the grinding trigger end 603. The middle part of the outer wall of the main hollow rod 601 is fixedly connected with the transmission end 604. The inner wall of the main hollow rod 601 is installed with an internal fixing rod 607. A first torsion spring 606 and a second torsion spring 6061 are installed between the internal fixing rod 607 and the inner wall of the main hollow rod 601. One end of the first torsion spring 606 is fixedly connected to the glue spraying trigger end 602, and the other end of the first torsion spring 606 is fixedly connected to the middle part of the internal fixing rod 607. One end of the second torsion spring 6061 is fixedly connected to the grinding trigger end 603. The other end is fixedly connected to the middle part of the internal fixing rod 607, the gap between the internal fixing rod 607 and the inner wall of the main hollow rod 601 is larger than the cross-sectional diameter of the first torsion spring 606 or the second torsion spring 6061, and the main hollow rod 601 is located on both sides of the transmission end 604 and is respectively wound with a lowering rope 605, one end of the lowering rope 605 is fixedly connected to the middle part of the outer wall of the main hollow rod 601, the lowering rope 605 on the side of the glue spraying trigger end 602 is fixedly connected to the glue spraying rope 6051, and the bottom end of the glue spraying rope 6051 is fixedly connected to the glue dispensing valve 7, the lowering rope 605 on the side of the grinding trigger end 603 is fixedly connected to the grinding rope 6052, and the bottom end of the grinding rope 6052 is fixedly connected to the electric grinder 8, and the inside of the device body 5 is located A transmission motor 608 is provided on one side of the transmission end 604, and the output shaft of the transmission motor 608 is connected to the transmission end 604 through a belt. The device body 5 is provided with a receiving groove for the main body hollow rod 601, and the receiving groove of the device body 5 is located at the transmission end 604 and a transmission groove 504 is provided. The receiving groove of the device body 5 is located at the glue spraying trigger end 602 and a first triggering groove 5021 is provided. The receiving groove of the device body 5 is located at the grinding trigger end 603 and a second triggering groove 503 is provided. The receiving groove of the device body 5 is located at a side close to the glue spraying trigger end 602 and away from the transmission motor 608. A pull rope groove 505 is provided at the position where the lowering rope 605 is located. The glue spraying rope 6051 passes through the pull rope groove 505 and is connected with the lowering rope 605.The receiving groove of the device body 5 is symmetrically provided with another rope groove 505 with the main body hollow rod 601 as the center, and the other rope groove 505 is connected to the grinding rope 6052. The device body 5 is provided with a pull-back tooth groove 5071 at the top of the pull-back groove 502, and a pull-back gear 507 is installed in the pull-back tooth groove 5071. Through such an arrangement, when operating, the dispensing valve 7 and the electric grinder 8 can reach any position above the workbench under the action of the rotating auxiliary rod 301 and the pull-back gear 507. The device body 5 is located on the transverse rod 4 and the transverse rack 401 through the pull-back gear 507 to move, and the top of the outer wall of the device body 5 is located close to One end of a pull-back spring 501 is fixedly connected to one side of the nearly rotating main rod 3, and the other end of the pull-back spring 501 is fixedly connected to the top of the rotating secondary rod 301. The device body 5 is also provided with a fixing groove 506, and the fixing groove 506 is fixedly connected to the inner fixing rod 607. A first lowering groove 5022 is provided on one side of the first triggering groove 5021, and a first pressing switch 5023 is fixedly connected to the bottom end of the first lowering groove 5022. A first elastic piece 5024 is fixedly connected to the inner wall of the first lowering groove 5022. The first elastic piece 5024 does not contact the main hollow rod 601 under normal conditions. When the first elastic piece 5024 contacts the main hollow rod 601, it is in a downward position. The first push switch 5023 is used to control the transmission motor 608 to reverse, the second trigger slot 503 is provided with a second lowering slot 5031, the second lowering slot 5031 and the first lowering slot 5022 are centrally symmetrically arranged with the main hollow rod 601 as the center, the second lowering slot 5031 is fixedly connected with the second push switch 5032 at the bottom end of the slot, the second lowering slot 5031 is fixedly connected with the second spring piece 5033 on the inner side wall of the slot, the second spring piece 5033 does not contact the grinding trigger end 603 under normal conditions, and the second spring piece 5033 is in a downward pressing state when in contact with the main hollow rod 601, and the second push switch 5032 is used to control the transmission When the motor 608 rotates forward, the first push switch 5023 and the second push switch 5032 control the transmission motor 608 to rotate forward and reverse, and the control time is 1s, which can prevent the problem of excessive assistance. The dispensing valve 7 is used to assemble multiple sand cores. When an adhesive is needed to combine the sand cores, the dispensing valve 7 can be pulled to control the dispensing valve 7 to spray the adhesive. When the assembly is carried out, due to the problem of burrs, it cannot be installed. At this time, the electric grinder 8 is pulled and turned on to grind the sand core that needs to be trimmed. The dispensing valve 7 is connected to the special glue injection machine through the glue injection tube, and a push switch is set on it.

[0027] Working principle of the present invention:

[0028] The sand core to be assembled is placed on the assembly table 1 for assembly. First, the glue dispensing valve 7 and the electric grinder 8 are pulled at the same time to project the transverse rod 4 perpendicular to the assembly table 1. When assembling the sand core, if it is found that the assembled sand core is unstable, the glue dispensing valve 7 is pulled at this time. After the glue dispensing valve 7 is pulled, in order to ensure that the sand core is stable during subsequent pouring, the sand core needs to be processed. When processing, first observe why the sand core cannot be assembled stably. When checking, it is found that the sand core has burrs. At this time, the electric grinder 8 is pulled down, so that the grinding rope 6052 is pulled down by the electric grinder 8, causing the main hollow rod 601 to be pulled at the grinding trigger end 603, so that the grinding trigger end 603 is pulled by the grinding rope 6052, so that the edge and the second spring The first spring 506 and the second spring 6061 are in contact with each other, and the grinding rope 6052 is pulled down to rotate forward, so that the second spring 5033 is in contact with the second spring sheet 5033, and the second push switch 5032 is pressed down, so that the second spring sheet 5033 presses the second push switch 5032, thereby controlling the transmission motor 608 to rotate forward to assist, and at the same time, the main hollow rod 601 releases the rope groove 505, so that the electric grinder 8 falls. At the same time, due to the assistance of the transmission motor 608, the first torsion spring 606 and the second torsion spring 6061 are twisted, and the electric grinder 8 is turned on to perform the grinding operation. When performing the grinding operation, it slides slowly along the burr. When sliding, in order to ensure the accuracy of sliding, the pull-back spring 501 will be pulled when pulling, thereby changing the position of the electric grinder 8, so as to achieve low-cost deburring operation.

[0029] When assembling the sand core, if the sand core is found to be loose, after confirming that the sand core size is in compliance, in order to improve the quality of the finished product and reduce the scrap rate of the finished product, it is necessary to use glue spraying to stabilize the quality of each assembled sand core. At this time, the glue dispensing valve 7 can be pulled, so that the main hollow rod 601 is located at the glue spraying trigger end 602 and receives a pulling force. Since the two sides of the main hollow rod 601 are only fixedly connected to the first torsion spring 606 and the second torsion spring 6061, the glue spraying trigger end 602 is subjected to the pulling force of the glue spraying rope 6051, so that the edge contacts the first lowering groove 5022. Since the glue spraying rope 6051 is pulled down in reverse, it contacts the first spring sheet 5024, thereby The first spring sheet 5024 is pressed downward, so that the first spring sheet 5024 presses the first push switch 5023, thereby controlling the transmission motor 608 to rotate forward to assist, and at the same time, the main hollow rod 601 releases the rope groove 505, so that the dispensing valve 7 falls. Due to the assistance of the transmission motor 608, the first torsion spring 606 and the second torsion spring 6061 are twisted, and the dispensing valve 7 is opened to spray glue. When the glue spraying operation is performed, when the designated position is reached, the pulling force pulling the glue spraying trigger end 602 is lost, so that the edge of the glue spraying trigger end 602 no longer contacts the first spring sheet 5024, and the lowering operation will not continue;

[0030] When the glue spraying operation is completed, the pulling force is lost and no other operations are performed. Since the main hollow rod 601 is no longer tilted as a whole, the first torsion spring 606 and the main hollow rod 601 begin to release the torsion force, thereby pulling the glue dispensing valve 7 or the electric grinder 8 back to the initial state, so that the subsequent sand core assembly operation will not be affected after the work is completed.

[0031] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A jig for assembling multiple sand cores, comprising an assembly table (1), characterized in that: A sand core (2) is placed on the top of the assembly table (1); a rotating main rod (3) is fixedly connected to one side of the assembly table (1); a rotating secondary rod (301) is movably connected to the inner wall of the rotating main rod (3); a transverse rod (4) is fixedly connected to the outer wall of the top of the rotating main rod (3); a transverse rack (401) is fixedly connected to the top of the transverse rod (4); a device body (5) is installed on the outer wall of the transverse rod (4) and the transverse rack (401); a pull-back groove (502) is provided on the transverse rod (4) and the transverse rack (401); an organic The mechanism assembly (6) comprises a main hollow rod (601), and the two sides of the main hollow rod (601) are respectively fixedly connected with a glue spraying trigger end (602) and a grinding trigger end (603); the side of the main hollow rod (601) located away from the rotating main rod (3) is fixedly connected to the glue spraying trigger end (602), and the side of the main hollow rod (601) close to the rotating main rod (3) is fixedly connected to the grinding trigger end (603); the middle part of the outer wall of the main hollow rod (601) is fixedly connected with a transmission end (604), and the inner wall of the main hollow rod (601) is installed with an inner fixing rod (607).

2. The multiple sand core assembly jig according to claim 1, characterized in that: A first torsion spring (606) and a second torsion spring (6061) are installed between the inner fixing rod (607) and the inner wall of the main hollow rod (601); one end of the first torsion spring (606) is fixedly connected to the glue spraying trigger end (602); the other end of the first torsion spring (606) is fixedly connected to the middle part of the inner fixing rod (607); one end of the second torsion spring (6061) is fixedly connected to the grinding trigger end (603); the other end of the second torsion spring (6061) is fixedly connected to the middle part of the inner fixing rod (607); the gap between the inner fixing rod (607) and the inner wall of the main hollow rod (601) is larger than that of the first torsion spring (606). or the cross-sectional diameter of the second torsion spring (6061), the main hollow rod (601) is located at both sides of the transmission end (604) and is respectively wound with a lowering rope (605), one end of each of the lowering ropes (605) is fixedly connected to the middle part of the outer wall of the main hollow rod (601), the lowering rope (605) located on one side of the glue spraying trigger end (602) is fixedly connected to the glue spraying rope (6051), the bottom end of the glue spraying rope (6051) is fixedly connected to the glue dispensing valve (7), the lowering rope (605) located on one side of the grinding trigger end (603) is fixedly connected to the grinding rope (6052), and the bottom end of the grinding rope (6052) is fixedly connected to an electric grinder (8).

3. The multiple sand core assembly jig according to claim 2, characterized in that: A transmission motor (608) is provided inside the device body (5) at one side of the transmission end (604); the output shaft of the transmission motor (608) is connected to the transmission end (604) through a belt; the device body (5) is provided with a receiving groove for the main body hollow rod (601); the receiving groove of the device body (5) is provided at the transmission end (604); the receiving groove of the device body (5) is provided at the glue spraying trigger end (602); ) is provided with a first trigger groove (5021), the receiving groove of the device body (5) is provided with a second trigger groove (503) at the grinding trigger end (603), the receiving groove of the device body (5) is provided with a pull rope groove (505) at a position where the lowering rope (605) is located close to the glue spraying trigger end (602) and away from the transmission motor (608), and the glue spraying rope (6051) passes through the pull rope groove (505) to be connected with the lowering rope (605).

4. The multiple sand core assembly jig according to claim 3, characterized in that: The receiving groove of the device body (5) is symmetrically provided with another rope groove (505) with the main body hollow rod (601) as the center, and the other rope groove (505) is connected to the grinding rope (6052). The device body (5) is provided with a pull-back tooth groove (5071) at the top of the pull-back groove (502), and a pull-back gear (507) is installed in the pull-back tooth groove (5071). Through such an arrangement, when operating, the dispensing valve (7) and the electric grinder (8) can reach any position above the workbench under the action of the rotating auxiliary rod (301) and the pull-back gear (507). The device body (5) is located on the transverse rod (4) and the transverse rack (401) through the pull-back gear (507) to move, and the top of the outer wall of the device body (5) is located on the side close to the rotating main rod (3) and is fixedly connected with a pull-back spring. The first trigger slot (5021) is provided with a first lowering slot (5022), the bottom end of which is fixedly connected with a first pressing switch (5023), and the inner wall of which is fixedly connected with a first elastic sheet (5024). The first elastic sheet (5024) does not contact the main hollow rod (601) in a normal state. When the first elastic sheet (5024) contacts the main hollow rod (601), it is in a downward pressing state. The first pressing switch (5023) is used to control the transmission motor (608) to reverse.

5. The multiple sand core assembly jig according to claim 4, characterized in that: A second lowering groove (5031) is provided at the second trigger groove (503), and the second lowering groove (5031) and the first lowering groove (5022) are centrally symmetrically arranged with the main hollow rod (601) as the center. A second pressing switch (5032) is fixedly connected to the bottom of the second lowering groove (5031), and a second elastic sheet (5033) is fixedly connected to the inner side wall of the second lowering groove (5031). The second elastic sheet (5033) does not contact the grinding trigger end (603) under normal conditions. When the second elastic sheet (5033) contacts the main hollow rod (601), it is in a downward pressing state. The second pressing switch (5032) is used to control the transmission motor (608) to rotate forward.

6. The multiple sand core assembly jig according to claim 5, characterized in that: When the first push switch (5023) and the second push switch (5032) control the transmission motor (608) to rotate forward and reverse, the control time is 1 second.

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