A manufacturing process for sand core molding of hydraulic pump body of construction machinery vehicle

Abstract

The present invention belongs to the technical field of sand core molding, and discloses a manufacturing process for sand core molding of a hydraulic pump body of an engineering machinery vehicle, including a drying device, and also including: a transmission cylinder, the transmission cylinder is movably installed at the bottom inside the drying device, and a transmission wheel is fixedly installed on the outside of the transmission cylinder. The present invention places the sand core body inside the drying device, pushes the support rod and the paddle to slide along the receiving rod, and bends the paddle to fit the outer periphery of the sand core body as much as possible, thereby improving the utilization efficiency of the heat inside the drying device. During the air extraction process, the driving motor drives the transmission wheel, the transmission cylinder, the receiving rod and the support rod to rotate through the belt. During the rotation process, the airflow inside the drying device moves downward in a spiral along the outer periphery of the sand core body, so that the surface of the sand core body is heated more evenly, avoiding the problem of uneven drying. At the same time, it can reduce the power of the drying equipment and improve the efficiency of drying the sand core body.

Description

Technical Field

[0001] The invention belongs to the technical field of sand core molding, in particular to a manufacturing process for sand core molding of a hydraulic pump body of an engineering machinery vehicle. Background Art

[0002] Sand core is a core material, which is made of a mixture of sand, binder and other additives. In the casting process of hydraulic pump body, sand core is placed in the corresponding position of the mold. When molten metal is poured into the mold, the metal will flow around the sand core and finally solidify, thus forming a cavity or complex shape inside the hydraulic pump body. The sand core manufacturing process includes raw material preparation, molding, curing treatment and inspection and finishing, among which the curing treatment usually places the molded sand core in a drying device for drying. At present, the specifications of hydraulic pump sand core are different, which makes it difficult for the hydraulic pump sand core to match the size of the drying equipment. If the volume of the drying equipment is too large, the volume of the hydraulic pump sand core is small. During the drying process, the heat in the drying equipment is difficult to contact the surface of the hydraulic pump sand core, resulting in an increase in the power of the drying equipment and an increase in the drying time of the hydraulic pump sand core, thereby affecting the drying effect of the hydraulic pump sand core. Therefore, a manufacturing process for forming the sand core of the hydraulic pump body of an engineering machinery vehicle is first proposed. Summary of the invention

[0003] In order to solve the problems raised in the above background technology, the present invention provides a manufacturing process for sand core molding of hydraulic pump body of engineering machinery vehicle, which solves the problem that the existing drying equipment is not matched with the sand core size, resulting in difficulty for heat to contact the surface of hydraulic pump sand core, thus affecting the drying effect of hydraulic pump sand core.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A manufacturing process for sand core molding of a hydraulic pump body of an engineering machinery vehicle, comprising a drying device, and also comprising;

[0005] A transmission cylinder, the transmission cylinder is movably mounted at the bottom of the drying device, a transmission wheel is fixedly mounted on the outside of the transmission cylinder, a driving motor is arranged at the bottom of the drying device, and the driving motor drives the transmission wheel and the transmission cylinder to rotate through a belt;

[0006] A guide assembly, wherein the guide assembly is fixedly mounted on the periphery of the transmission cylinder;

[0007] A receiving assembly, wherein the receiving assembly is arranged inside the transmission cylinder, and a sand core body is placed on the top of the receiving assembly;

[0008] A circulation component, wherein the circulation component circulates the air flow inside the drying device through a fan;

[0009] Wherein, the circulation component comprises a guide tube fixedly mounted on the outside of the drying device, one end of the guide tube is fixedly mounted with a docking tube, the docking tube is movably sleeved with the bottom of the transmission cylinder, the other end of the guide tube is connected to the top of the drying device, the other end of the guide tube is fixedly mounted with a guide plate at the bottom, a through groove is provided on the outside of the connecting end of the guide plate and the guide tube, and the guide plate is located at the upper end inside the drying device;

[0010] The guide assembly includes a receiving rod fixedly mounted on the outside of the transmission cylinder, a sliding groove is provided on the inner wall of the receiving rod, a support rod is slidably connected to the sliding groove, two ends of the support rod are respectively connected to paddles, a bolt is fixedly mounted on the side of the support rod, a resistance block is provided at the bottom of the bolt, and the support rod is fixed on the receiving rod by pushing the resistance block to resist the inside of the receiving rod through the bolt;

[0011] The outside of the transmission cylinder is symmetrically provided with rectangular through slots, and the two receiving rods are kept opposite to the two rectangular through slots.

[0012] Preferably, the receiving rod and the supporting rod form an "L" shape, and the cross-sections of the receiving rod and the supporting rod are both "C" shaped;

[0013] In an initial state, one end of the paddle is connected to the support rod, and the distance between the other end of the paddle and the sand core body is between 1-5 mm.

[0014] Preferably, the top of the receiving rod is kept level with the top of the transmission cylinder, and the height of the top of the transmission cylinder is lower than the height of the receiving assembly.

[0015] Preferably, the receiving assembly includes a fixing rod fixed inside the docking tube, the upper end of the fixing rod is fixed with a second support rod and a first support rod, the top of the second support rod and the first support rod are respectively fixed with a second spring sheet and a first spring sheet, and the top of the second support rod and the first spring sheet are respectively connected with a first support tube and a second support tube.

[0016] Preferably, the tops of the first support tube and the second support tube are both provided with communicating grooves, and the tops of the first support tube and the second support tube are both provided with an annular groove;

[0017] A limiting frame which is engaged with the inside of the groove is fixedly mounted on the top of the fixing rod, and the limiting frame is used to limit the height of the first supporting tube and the second supporting tube.

[0018] Preferably, an impeller is movably mounted on the upper end of the fixing rod, and the impeller is located inside the first supporting tube.

[0019] Preferably, two transmission blocks are fixedly mounted on the inner wall of the transmission cylinder, and a second convex block and a first convex block are fixedly mounted on the outside of the first support cylinder and the second support cylinder respectively;

[0020] The second bump and the first bump are both in an "Ω" shape, and the second bump is symmetrically arranged with the first bump.

[0021] Preferably, a vertical groove is opened on the outside of the first support tube, the second support rod slides vertically in the vertical groove, the second support tube is movably sleeved on the upper end of the first support tube, and the top of the first support tube and the second support tube maintain a plane.

[0022] Preferably, the two transmission blocks are in contact with the second convex block and the top surface of the transmission block respectively;

[0023] The two transmission blocks rotate and push the second support tube and the first support tube downward through the height of the second protrusion and the first protrusion in turn.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention places the sand core body inside the drying device, pushes the support rod and the paddle to slide along the receiving rod, and bends the paddle to fit the outer periphery of the sand core body as much as possible, and the fan extracts gas from the bottom of the drying device through the guide tube, the butt tube and the transmission cylinder. The gas inside the drying device is sucked and carries heat downward through the support rod, the paddle and the sand core body, so that the heat is gathered between the support rod and the sand core body. During the downward movement of the airflow, it contacts the surface of the sand core body, thereby improving the utilization efficiency of the heat inside the drying device. During the air extraction process, the driving motor drives the transmission wheel, the transmission cylinder, the receiving rod and the support rod to rotate through the belt. During the rotation process, the airflow inside the drying device moves downward in a spiral along the outer periphery of the sand core body, so that the surface of the sand core body is heated more evenly, avoiding the problem of uneven drying, and at the same time can reduce the power of the drying device and improve the drying efficiency of the sand core body.

[0026] The present invention drives the transmission block to rotate by rotating the transmission cylinder, and the upper transmission block moves along the top of the first protrusion, and at the same time pushes the second supporting cylinder downward along the curvature of the first protrusion and compresses the first elastic sheet. At this time, the top of the second supporting cylinder is out of contact with the bottom of the sand core body, and the transmission block continues to rotate the upper end to be out of contact with the first protrusion, and the first protrusion is reset under the action of the first elastic sheet to contact the top and the bottom of the sand core body, and support the sand core body. During the rotation process, the lower end transmission block moves along the top surface of the second protrusion, and pushes the first supporting cylinder downward along the curvature of the second protrusion, and the top is out of contact with the bottom of the sand core body, and the transmission block continues to rotate to be out of contact with the second protrusion, and the first supporting cylinder is reset under the action of the second elastic sheet to support the sand core body, thereby reciprocating through the first supporting cylinder and the second supporting cylinder and moving downward in turn out of contact with the bottom of the sand core body. The hot air flow inside the drying equipment enters the transmission cylinder through the rectangular through groove and contacts with the bottom of the sand core body, ensuring that the bottom of the sand core body is dried more comprehensively, and at the same time avoiding the problem of drying the four corners. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall appearance structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the matching structure of the circulation assembly and the transmission cylinder of the present invention;

[0029] Figure 3 This is a schematic diagram of the matching structure of the guide assembly and the transmission cylinder of the present invention;

[0030] Figure 4 This is a schematic diagram of the disassembled structure of the guide assembly of the present invention;

[0031] Figure 5 This is a schematic diagram of the matching structure of the guide assembly and the sand core body of the present invention;

[0032] Figure 6 It is a schematic diagram of the cross-sectional structure of the receiving component of the present invention;

[0033] Figure 7 For the present invention Figure 6 The enlarged structural diagram at A in the middle;

[0034] Figure 8 It is a schematic diagram of the disassembled structure of the transmission cylinder and the receiving assembly of the present invention;

[0035] Fig. 9 This is a schematic diagram of the disassembled structure of the receiving assembly of the present invention;

[0036] Fig.10 This is a schematic diagram of the disassembled cross-sectional structure of the receiving component of the present invention.

[0037] In the figure: 1. drying equipment; 2. circulation component; 21. guide plate; 22. through groove; 23. guide tube; 24. butt joint; 3. sand core body; 4. guide component; 41. receiving rod; 42. slide groove; 43. support rod; 44. paddle; 45. bolt; 46. resistance block; 47. rectangular through groove; 5. transmission cylinder; 6. drive motor; 7. fan; 8. transmission wheel; 9. receiving component; 91. first support cylinder; 911. first spring piece; 912. first support frame; 913. second spring piece; 914. second support rod; 915. fixing rod; 916. impeller; 917. limiting frame; 92. second support cylinder; 93. groove; 94. annular groove; 95. first protrusion; 96. second protrusion; 97. transmission block; 98. vertical groove. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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.

[0039] like Figures 1 to 10 As shown, the present invention provides a manufacturing process for sand core molding of a hydraulic pump body of an engineering machinery vehicle, comprising a drying device 1, and also comprising;

[0040] The transmission cylinder 5 is movably mounted at the bottom of the drying device 1. A transmission wheel 8 is fixedly mounted on the outside of the transmission cylinder 5. A driving motor 6 is arranged at the bottom of the drying device 1. The driving motor 6 drives the transmission wheel 8 and the transmission cylinder 5 to rotate through a belt.

[0041] A guide assembly 4, wherein the guide assembly 4 is fixedly mounted on the periphery of the transmission cylinder 5;

[0042] A receiving assembly 9, which is arranged inside the transmission cylinder 5, and a sand core body 3 is placed on the top of the receiving assembly 9;

[0043] The circulation component 2 circulates the air flow inside the drying device 1 through the fan 7;

[0044] The circulation component 2 includes a guide tube 23 fixedly mounted on the outside of the drying device 1, a butt joint 24 is fixedly mounted on one end of the guide tube 23, and the butt joint 24 is movably sleeved with the bottom of the transmission cylinder 5, and the guide tube 23 at the other end is connected to the top of the drying device 1, and a guide plate 21 is fixedly mounted on the bottom of the guide tube 23 at the other end, and a through groove 22 is provided on the outside of the connecting end of the guide plate 21 and the guide tube 23, and the guide plate 21 is located at the upper end inside the drying device 1;

[0045] The guide assembly 4 includes a receiving rod 41 fixedly mounted on the outside of the transmission cylinder 5. A slide groove 42 is provided on the inner wall of the receiving rod 41. A support rod 43 is slidably connected to the slide groove 42. Both ends of the support rod 43 are respectively connected to paddles 44. A bolt 45 is fixedly mounted on the side of the support rod 43. A resistance block 46 is provided at the bottom of the bolt 45. The support rod 43 is fixed on the receiving rod 41 by pushing the resistance block 46 through the bolt 45 to resist the inside of the receiving rod 41.

[0046] The transmission cylinder 5 is symmetrically provided with rectangular through slots 47, and the two receiving rods 41 are opposite to the two rectangular through slots 47;

[0047] The receiving rod 41 and the supporting rod 43 form an "L" shape, and the cross-sections of the receiving rod 41 and the supporting rod 43 are both "C" shaped;

[0048] In the initial state, one end of the paddle 44 is connected to the support rod 43, and the distance between the other end of the paddle 44 and the sand core body 3 is between 1-5 mm;

[0049] The top of the receiving rod 41 is kept level with the top of the transmission cylinder 5 , and the height of the top of the transmission cylinder 5 is lower than the height of the receiving assembly 9 .

[0050] The sand core body 3 is placed inside the drying equipment 1 and located at the top of the receiving assembly 9, the support rod 43 and the paddle 44 are pushed to slide along the receiving rod 41, and the paddle 44 is bent to fit the outer periphery of the sand core body 3 as much as possible, and the rotating bolt 45 pushes the abutment block 46 to abut against the receiving rod 41, so that the support rod 43 and the paddle 44 are fixed on the receiving rod 41, and the working internal temperature of the drying equipment 1 is continuously increased to dry the sand core body 3, and at the same time, the fan 7 is started to extract gas from the bottom of the drying equipment 1 through the guide pipe 23, the docking pipe 24 and the transmission cylinder 5. Since the sand core body 3 is placed on the top of the receiving assembly 9, and the height of the receiving assembly 9 is higher than the transmission cylinder 5 and the receiving rod 41, the sand core body 3 will be located at the top of the receiving rod 41 and block the top of the receiving rod 41 and the transmission cylinder 5, and the support rod 43 is arranged on the outer periphery of the sand core body 3 through the paddle 44, and during the process of the fan 7 exhausting air from the inside of the drying equipment 1 through the transmission cylinder 5, the drying equipment The gas inside the drying device 1 is sucked and carries heat to move downward through the support rod 43, the paddle 44 and the sand core body 3, so that the heat is gathered between the support rod 43 and the sand core body 3. During the downward movement of the airflow, it contacts the surface of the sand core body 3, thereby improving the utilization efficiency of the heat inside the drying device 1. During the air extraction process, the driving motor 6 drives the transmission wheel 8, the transmission cylinder 5, the receiving rod 41 and the support rod 43 to rotate through the belt. During the rotation process, the airflow inside the drying device 1 moves downward in a spiral along the outer periphery of the sand core body 3, so that the surface of the sand core body 3 is heated more evenly, avoiding the problem of uneven drying. The extracted gas enters the rectangular through groove 47, the transmission cylinder 5, and the guide tube 23, enters the top of the drying device 1 through the through groove 22, and is then guided and dispersed by the guide plate 21. Since the heat inside the drying device 1 is gathered at the top, the dispersed airflow carries the heat inside the drying device 1 and continues to contact the surface of the sand core body 3 to dry the sand core body 3.

[0051] like Figure 6-Figure 10 As shown, the receiving assembly 9 includes a fixing rod 915 fixedly mounted inside the butt-jointed tube 24, a second support rod 914 and a first support rod 912 are fixedly mounted on the fixing rod 915, a second elastic sheet 913 and a first elastic sheet 911 are fixedly mounted on the top of the second support rod 914 and the first support rod 914, respectively, and the tops of the second support rod 914 and the first elastic sheet 911 are connected to the first support tube 91 and the second support tube 92 respectively;

[0052] A communicating groove 93 is formed at the top of the first support tube 91 and the second support tube 92, and an annular groove 94 is formed at the top of the first support tube 91 and the second support tube 92;

[0053] A limiting frame 917 engaged in the groove 93 is fixedly mounted on the top of the fixing rod 915 . The limiting frame 917 is used to limit the height of the first supporting tube 91 and the second supporting tube 92 .

[0054] The first support tube 91 and the second support tube 92 are limited by the limiting frame 917 under the action of the second spring piece 913 and the first spring piece 911, so that the tops of the first support tube 91 and the second support tube 92 are kept in the same plane, and then the formed sand core of the hydraulic pump body of the engineering machinery vehicle is placed on the tops of the first support tube 91 and the second support tube 92, and the sand core is supported by the drying equipment 1 and the second support tube 92. The stability of the placement of the sand core can be improved by the annular groove 94 on the top of the first support tube 91 and the circulation component 2.

[0055] like Figure 6 As shown, an impeller 916 is movably mounted on the upper end of the fixing rod 915 , and the impeller 916 is located inside the first supporting cylinder 91 .

[0056] Air is extracted from the transmission cylinder 5 and the drying device 1 through the fan 7, and the gas enters the transmission cylinder 5 through the rectangular groove 47. At the same time, the impeller 916 rotates due to the suction force, and the hot air flow can be stirred during the rotation, so that the hot air flow is evenly in contact with the bottom of the sand core body 3.

[0057] like Figure 6-Figure 10 As shown, two transmission blocks 97 are fixedly mounted on the inner wall of the transmission cylinder 5, and second protrusions 96 and first protrusions 95 are fixedly mounted on the outside of the first support cylinder 91 and the second support cylinder 92 respectively;

[0058] The second protrusion 96 and the first protrusion 95 are both in an "Ω" shape, and the second protrusion 96 and the first protrusion 95 are symmetrically arranged;

[0059] A vertical groove 98 is formed on the outside of the first support tube 91, and the second support rod 914 vertically slides in the vertical groove 98. The second support tube 92 is movably sleeved on the upper end of the first support tube 91, and the tops of the first support tube 91 and the second support tube 92 maintain a plane.

[0060] The two transmission blocks 97 are in contact with the second protrusion 96 and the top surface of the transmission block 97 respectively;

[0061] The two transmission blocks 97 rotate and sequentially pass through the height of the second protrusion 96 and the first protrusion 95 to push the second support tube 92 and the first support tube 91 downward.

[0062] The transmission block 97 is driven to rotate by the rotation of the transmission cylinder 5, and the upper transmission block 97 moves along the top of the first protrusion 95, and at the same time pushes the second support cylinder 92 downward along the arc of the first protrusion 95 and compresses the first elastic sheet 911. At this time, the top of the second support cylinder 92 is separated from the contact with the bottom of the sand core body 3, and the transmission block 97 continues to rotate and the upper end is separated from the contact with the first protrusion 95. Under the action of the first elastic sheet 911, the first protrusion 95 is reset to contact the bottom of the sand core body 3 and support the sand core body 3.

[0063] During the rotation process, the lower end transmission block 97 moves along the top surface of the second protrusion 96, and pushes the first support tube 91 downward along the curvature of the second protrusion 96, and the top is disengaged from the bottom contact of the sand core body 3, and the transmission block 97 continues to rotate to disengage from the second protrusion 96. The first support tube 91 is reset under the action of the second spring piece 913 to support the sand core body 3, and thus the first support tube 91 and the second support tube 92 are moved downward in turn to disengage from the bottom contact of the sand core body 3. The hot air flow inside the drying equipment 1 enters the transmission tube 5 through the rectangular through groove 47 and contacts with the bottom of the sand core body 3, ensuring that the bottom of the sand core body 3 is dried more comprehensively, while avoiding the problem of drying the four corners.

[0064] The working principle and use process of the present invention:

[0065] The sand core body 3 is placed inside the drying equipment 1 and located at the top of the receiving assembly 9, the support rod 43 and the paddle 44 are pushed to slide along the receiving rod 41, and the paddle 44 is bent to fit the outer periphery of the sand core body 3 as much as possible, and the rotating bolt 45 pushes the abutment block 46 to abut against the receiving rod 41, so that the support rod 43 and the paddle 44 are fixed on the receiving rod 41, and the working internal temperature of the drying equipment 1 is continuously increased to dry the sand core body 3, and at the same time, the fan 7 is started to extract gas from the bottom of the drying equipment 1 through the guide pipe 23, the docking pipe 24 and the transmission cylinder 5. Since the sand core body 3 is placed on the top of the receiving assembly 9, and the height of the receiving assembly 9 is higher than the transmission cylinder 5 and the receiving rod 41, the sand core body 3 will be located at the top of the receiving rod 41 and block the top of the receiving rod 41 and the transmission cylinder 5, and the support rod 43 is arranged on the outer periphery of the sand core body 3 through the paddle 44, and during the process of the fan 7 exhausting air from the inside of the drying equipment 1 through the transmission cylinder 5, the drying equipment The gas inside the drying device 1 is sucked and carries heat downward through the support rod 43, the paddle 44 and the sand core body 3, so that the heat is gathered between the support rod 43 and the sand core body 3. During the downward movement of the airflow, it contacts the surface of the sand core body 3, thereby improving the utilization efficiency of the heat inside the drying device 1. During the air extraction process, the driving motor 6 drives the transmission wheel 8, the transmission cylinder 5, the receiving rod 41 and the support rod 43 to rotate through the belt. During the rotation process, the airflow inside the drying device 1 moves downward in a spiral along the outer periphery of the sand core body 3, so that the surface of the sand core body 3 is heated more evenly, avoiding the problem of uneven drying. The extracted gas enters the rectangular through groove 47, the transmission cylinder 5, and the guide tube 23, enters the top of the drying device 1 through the through groove 22, and is then guided and dispersed by the guide plate 21. Since the heat inside the drying device 1 is gathered at the top, the dispersed airflow carries the heat inside the drying device 1 and continues to contact the surface of the sand core body 3 to dry the sand core body 3;

[0066] During the drying process, the transmission cylinder 5 rotates to drive the transmission block 97 to rotate, and the upper transmission block 97 moves along the top of the first protrusion 95, and at the same time pushes the second support cylinder 92 downward along the arc of the first protrusion 95 and compresses the first elastic sheet 911. At this time, the top of the second support cylinder 92 is separated from the bottom contact of the sand core body 3, and the transmission block 97 continues to rotate and the upper end is separated from the contact with the first protrusion 95. Under the action of the first elastic sheet 911, the first protrusion 95 is reset to the top and contact with the bottom of the sand core body 3, and supports the sand core body 3;

[0067] During the rotation process, the lower end transmission block 97 moves along the top surface of the second protrusion 96, and pushes the first support tube 91 downward along the curvature of the second protrusion 96, and the top is separated from the contact with the bottom of the sand core body 3, and the transmission block 97 continues to rotate to separate from the contact with the second protrusion 96. The first support tube 91 is reset under the action of the second spring piece 913 to support the sand core body 3, and thus the first support tube 91 and the second support tube 92 are moved downward in turn to separate from the contact with the bottom of the sand core body 3. The hot air flow inside the drying equipment 1 enters the transmission tube 5 through the rectangular through groove 47 and contacts with the bottom of the sand core body 3, thereby ensuring that the bottom of the sand core body 3 is dried more comprehensively.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A manufacturing process for sand core molding of a hydraulic pump body of an engineering machinery vehicle, comprising a drying device (1), characterized in that: Also includes; A transmission cylinder (5), the transmission cylinder (5) being movably mounted on the bottom of the drying device (1), a transmission wheel (8) being fixedly mounted on the outside of the transmission cylinder (5), a driving motor (6) being arranged at the bottom of the drying device (1), the driving motor (6) driving the transmission wheel (8) and the transmission cylinder (5) to rotate via a belt; A guide assembly (4), the guide assembly (4) being fixedly mounted on the periphery of the transmission cylinder (5); A receiving assembly (9), the receiving assembly (9) being arranged inside the transmission cylinder (5), and a sand core body (3) being placed on the top of the receiving assembly (9); A circulation component (2), wherein the circulation component (2) circulates air flow inside the drying device (1) via a fan (7); The circulation component (2) comprises a guide tube (23) fixedly mounted on the outside of the drying device (1), a butt joint tube (24) fixedly mounted on one end of the guide tube (23), the butt joint tube (24) being movably sleeved with the bottom of the transmission cylinder (5), the guide tube (23) at the other end being connected to the top of the drying device (1), a guide plate (21) fixedly mounted on the bottom of the guide tube (23) at the other end, a through groove (22) being formed on the outside of the connecting end of the guide plate (21) and the guide tube (23), the guide plate (21) being located at the upper end inside the drying device (1); The guide assembly (4) comprises a receiving rod (41) fixedly mounted on the outside of the transmission cylinder (5); a slide groove (42) is provided on the inner wall of the receiving rod (41); a support rod (43) is slidably connected to the slide groove (42); two ends of the support rod (43) are respectively connected to paddles (44); a bolt (45) is fixedly mounted on the side of the support rod (43); a resistance block (46) is provided at the bottom of the bolt (45); the support rod (43) is fixedly mounted on the receiving rod (41) by the bolt (45) pushing the resistance block (46) to resist the inside of the receiving rod (41); The transmission cylinder (5) is symmetrically provided with rectangular through slots (47) on its exterior, and the two receiving rods (41) are kept opposite to the two rectangular through slots (47); The receiving assembly (9) comprises a fixing rod (915) fixedly mounted inside the butt-jointing tube (24); a second support rod (914) and a first support frame (912) are fixedly mounted on the fixing rod (915); a second elastic sheet (913) and a first elastic sheet (911) are fixedly mounted on the top of the second support rod (914) and the first support frame (912); and the first support tube (91) and the second support tube (92) are connected to the top of the second support rod (914) and the first elastic sheet (911); A communicating groove (93) is provided at the top of each of the first supporting tube (91) and the second supporting tube (92); and an annular groove (94) is provided at the top of each of the first supporting tube (91) and the second supporting tube (92); A limiting frame (917) is fixedly mounted on the top of the fixing rod (915) and is engaged with the inside of the groove (93). The limiting frame (917) is used to limit the height of the first supporting tube (91) and the second supporting tube (92).

2. The manufacturing process of sand core molding of hydraulic pump body for construction machinery vehicle according to claim 1 is characterized in that: The receiving rod (41) and the supporting rod (43) form an "L" shape, and the cross-sections of the receiving rod (41) and the supporting rod (43) are both "C" shaped; In an initial state, one end of the paddle (44) is connected to the support rod (43), and the distance between the other end of the paddle (44) and the sand core body (3) is between 1 and 5 mm.

3. The manufacturing process of sand core molding of hydraulic pump body of construction machinery vehicle according to claim 2 is characterized in that: The top of the receiving rod (41) is kept level with the top of the transmission cylinder (5), and the height of the top of the transmission cylinder (5) is lower than the height of the receiving assembly (9).

4. The manufacturing process of sand core molding of hydraulic pump body for construction machinery vehicle according to claim 1 is characterized in that: An impeller (916) is movably mounted on the upper end of the fixing rod (915), and the impeller (916) is located inside the first supporting cylinder (91).

5. The manufacturing process of sand core molding of hydraulic pump body for construction machinery vehicle according to claim 1 is characterized in that: Two transmission blocks (97) are fixedly mounted on the inner wall of the transmission cylinder (5); second convex blocks (96) and first convex blocks (95) are fixedly mounted on the outside of the first support cylinder (91) and the second support cylinder (92) respectively; The second protrusion (96) and the first protrusion (95) are both in an "Ω" shape, and the second protrusion (96) and the first protrusion (95) are symmetrically arranged.

6. The manufacturing process of sand core molding for hydraulic pump body of construction machinery vehicle according to claim 5, characterized in that: A vertical groove (98) is provided on the outside of the first support tube (91), the second support rod (914) slides vertically in the vertical groove (98), the second support tube (92) is movably sleeved on the upper end of the first support tube (91), and the tops of the first support tube (91) and the second support tube (92) maintain a plane.

7. The manufacturing process of sand core molding for hydraulic pump body of construction machinery vehicle according to claim 6, characterized in that: The two transmission blocks (97) are in contact with the second protrusion (96) and the top surface of the transmission block (97) respectively; The two transmission blocks (97) rotate and sequentially pass through the height of the second protrusion (96) and the first protrusion (95) to push the second support tube (92) and the first support tube (91) downward.

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