A positioning fixture for assembling a grain dryer

Abstract

The present invention discloses a positioning fixture for assembling a grain dryer, comprising: a base; an angle adjustment component, which is arranged on the left side of the base and is slidably connected to the base; a limit component, wherein the first end of the limit component is fixed to the base; a screw rod adjustment component, wherein the first end of the screw rod adjustment component is fixed to the base, and the second end of the screw rod adjustment component is connected to the angle adjustment component; a hinge component, wherein the first end of the hinge component is fixed to the right side of the base; a support component, which is fixed to the second end of the hinge component, and one side of the support component is connected to a pressure plate; a cam handle, which is connected to the base and arranged above the pressure plate; wherein the second end of the limit component passes through the pressure plate and is movably connected to the cam handle; the positioning, clamping and workpiece removal operations of the present invention are convenient and fast with high efficiency; the assembly and positioning of different workpieces of the grain dryer can be met, and the use range of the fixture is wide.

Description

Technical Field

[0001] The invention belongs to the field of assembly fixtures, and in particular relates to a positioning fixture for assembling a grain dryer. Background Art

[0002] Grain dryer is a kind of agricultural machinery equipment that has only emerged in China in recent years. In agricultural production, the main role of this equipment is to quickly dry and hydrate newly harvested grains. Compared with the traditional natural drying method, the biggest advantage of using grain dryers to dry and hydrate grains is that it is not restricted by weather conditions and can be carried out in any weather environment. In addition, using corn dryers to dry and hydrate grains also has the advantages of high drying efficiency, fast hydration speed, saving manpower and space, etc.

[0003] A fixture is also called a clamp. In a broad sense, any device used to quickly, conveniently and safely install workpieces in any process of equipment production can be called a fixture. For example, welding fixtures, inspection fixtures, assembly fixtures, machine tool fixtures, etc.

[0004] The application of fixtures is beneficial to ensure the processing accuracy of workpieces and stabilize product quality; it is beneficial to improve labor productivity and reduce costs; it is beneficial to improve workers' working conditions and ensure safe production.

[0005] In the production and assembly process of grain dryers, sheet metal parts, welded parts and spray-painted parts are involved. The workpieces are generally positioned manually. The manual positioning and assembly errors are large, which seriously affects the consistency of the product and has low assembly efficiency. Summary of the invention

[0006] In view of the above problems, the present invention provides a positioning fixture for assembling a grain dryer, which is used for clamping and positioning during the production and assembly process of the grain dryer, thereby ensuring assembly quality and improving production efficiency.

[0007] A positioning fixture for assembling a grain dryer comprises: a base; an angle adjustment assembly, which is arranged on the left side of the base and is slidably connected to the base; a limit assembly, wherein the first end of the limit assembly is fixed to the base; a screw adjustment assembly, wherein the first end of the screw adjustment assembly is fixed to the base, and the second end of the screw adjustment assembly is connected to the angle adjustment assembly; a hinge assembly, wherein the first end of the hinge assembly is fixed to the right side of the base; a support assembly, which is fixed to the second end of the hinge assembly, and one side of the support assembly is connected to a pressure plate; a cam handle, which is connected to the base and is arranged above the pressure plate; wherein the second end of the limit assembly passes through the pressure plate and is movably connected to the cam handle.

[0008] Furthermore, guide rails are symmetrically distributed along the horizontal midline on the left side of the base, the bottom of the angle adjustment assembly is connected to the guide rail, a positioning pin is provided on the right side of the guide rail, a limit assembly fixing hole is provided on the right side of the positioning pin, the first end of the limit assembly is connected to the limit assembly fixing hole, a positioning bead is provided on the right side of the limit assembly fixing hole, a hinge assembly fixing hole is provided on the right side of the positioning bead, the first end of the hinge assembly is connected to the hinge assembly fixing hole, support plates are provided on the upper and lower sides of the limit assembly fixing hole, bearing assemblies are provided on the outer sides of the support plates, and the cam handle is connected to the bearing assembly.

[0009] Furthermore, the limiting assembly includes a first cylindrical pin, a nut and a first spring. The first end of the first cylindrical pin is provided with an external thread, and the second end is an arc-shaped surface. The external thread of the first end of the first cylindrical pin is connected to the fixing hole of the limiting assembly. The first cylindrical pin is also provided with a nut. The nut cooperates with the external thread of the first end of the first cylindrical pin to fix the first cylindrical pin on the base. The first spring is provided on the first cylindrical pin, and the first spring is arranged between the nut and the pressure plate.

[0010] Furthermore, the support assembly includes a fixed plate, a spring connecting block, a second cylindrical pin and a second spring. The spring connecting block is arranged on the left side of the fixed plate. A circular hole is opened in the center of the spring connecting block and the fixed plate. The first end of the second cylindrical pin is provided with an external thread. The pressure plate is fixedly connected to the external thread of the first end of the second cylindrical pin. The second end of the second cylindrical pin passes through the circular holes on the spring connecting block and the fixed plate and can slide in the circular holes on the spring connecting block and the fixed plate. The second spring is mounted on the second cylindrical pin. The first end of the second spring is fixedly connected to the spring connecting block, and the second end of the second spring is fixedly connected to the pressure plate.

[0011] Furthermore, a through hole is opened in the middle of the pressure plate, and the second end of the first cylindrical pin passes through the through hole and is movably connected to the cam handle. The inner diameter of the through hole is larger than the outer diameter of the first cylindrical pin.

[0012] Furthermore, the cross section of the left bottom of the pressing plate is a continuous W-shape.

[0013] Furthermore, the angle adjustment assembly includes a base plate, a roller assembly, a side plate, a first hydraulic cylinder connecting block, a hydraulic cylinder, and a second hydraulic cylinder connecting block. The base plate is fixed on the guide rail, and two roller assemblies are symmetrically distributed along the horizontal center line on the right side of the base plate. Pins are provided on the upper and lower sides of the right side of the side plate. The side plate is connected to the roller assembly through the pins and can rotate around the pins. A second hydraulic cylinder connecting block is provided at the horizontal center line position on the left side of the base plate, and the bottom of the hydraulic cylinder is rotatably connected to the second hydraulic cylinder connecting block. A first hydraulic cylinder connecting block is provided at the horizontal center line position on the bottom of the side plate, and the first hydraulic cylinder connecting block is rotatably connected to the piston rod of the hydraulic cylinder.

[0014] Furthermore, the screw adjustment assembly includes a first connecting plate, a second connecting plate, a screw, a screw nut, a turntable and a fixing ring. The bottom of the first connecting plate is fixed to the left side of the base, a screw nut is fixed in the middle position of the first connecting plate, the bottom of the second connecting plate is connected to the angle adjustment assembly, a round hole is provided in the middle of the second connecting plate, the first end of the screw is connected to the turntable, the second end of the screw is smooth, the second end of the screw passes through the screw nut and the round hole of the second connecting plate, fixing rings are provided on the left and right sides of the round hole in the middle of the second connecting plate, the fixing ring is connected to the second end of the screw, and the second end of the screw can rotate in the round hole in the middle of the second connecting plate.

[0015] Furthermore, the cam handle includes a cam portion, a handle portion and a shaft rod, the handle portion is fixed on the cam portion, both ends of the shaft rod are fixed on the bearing assembly, the bottom of the cam portion contacts the upper surface of the pressure plate, an accommodating cavity is provided inside the cam portion, circular holes are provided on both sides of the accommodating cavity, the shaft rod passes through the circular holes and is fixedly connected to the cam portion, a sleeve is provided in the accommodating cavity, the first end of the sleeve is connected to the shaft rod, the sleeve can rotate around the shaft rod, a waist-shaped hole is opened at the bottom of the accommodating cavity, the second end of the limiting assembly passes through the waist-shaped hole and extends into the second end of the sleeve, and the second end of the limiting assembly can slide up and down in the second end of the sleeve.

[0016] Furthermore, the distance between the upper end surface of the positioning pin and the upper surface of the base is not greater than the distance between the second end of the positioning bead and the upper surface of the base.

[0017] The beneficial effects of the present invention are as follows: the positioning, clamping and workpiece removal operations of the present invention are convenient and fast with high efficiency; the assembly and positioning of different workpieces of the grain dryer can be met, and the use range of the clamp is wide.

[0018] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the overall structure of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the base structure of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of an angle adjustment component of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention;

[0023] Figure 4 This is a schematic structural diagram of a screw rod adjustment assembly of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic structural diagram of a support assembly of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of a pressing plate structure of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention;

[0026] Figure 7 It is a schematic diagram of the installation structure of a limit assembly and a cam handle of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention;

[0027] Figure 8 The present invention is a schematic diagram of the installation structure of a cam handle and a base of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention.

[0028] In the figure: 1-base, 2-angle adjustment assembly, 3-limiting assembly, 4-screw adjustment assembly, 5-hinge assembly, 6-support assembly, 7-pressure plate, 8-cam handle, 11-guide rail, 12-locating pin, 13-limiting assembly fixing hole, 14-locating bead, 15-support plate, 16-bearing assembly, 17-hinge assembly fixing hole, 21-bottom plate, 22-roller assembly, 23-side plate, 24-first hydraulic cylinder connecting block, 25-hydraulic cylinder, 2 6 - second hydraulic cylinder connecting block, 31 - first cylindrical pin, 32 - nut, 33 - first spring, 41 - first connecting plate, 42 - second connecting plate, 43 - lead screw, 44 - lead screw nut, 45 - turntable, 46 - fixing ring, 61 - fixing plate, 62 - spring connecting block, 63 - second cylindrical pin, 64 - second spring, 71 - through hole, 72 - blind hole, 81 - cam part, 82 - handle part, 83 - shaft rod, 84 - accommodating chamber, 85 - sleeve. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0030] See also Figure 1 , Figure 1 This is a schematic diagram of the overall structure of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention. The positioning fixture for assembling a grain dryer includes a base 1, an angle adjustment component 2, a limit component 3, a screw adjustment component 4, a hinge component 5, a support component 6, a pressure plate 7 and a cam handle 8.

[0031] Angle adjustment component 2 is arranged on the left side of the base 1 and is slidably connected to the base 1; the first end of the limit component 3 is fixed on the base 1; the first end of the screw adjustment component 4 is fixed to the base 1, and the second end of the screw adjustment component 4 is connected to the angle adjustment component 2; the first end of the hinge component 5 is fixed to the right side of the base; the support component 6 is fixed to the second end of the hinge component 5, and one side of the support component 6 is connected to the pressure plate 7; please refer to Figure 8 , Figure 8 This is a schematic diagram of the installation structure of the cam handle and base of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention. The cam handle 8 is connected to the base 1 and is arranged above the pressure plate 7; wherein the second end of the limit assembly 3 passes through the pressure plate 7 and is movably connected to the cam handle 8.

[0032] See also Figure 2 , Figure 2 The schematic diagram of the base structure of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention is shown in FIG. The base 1 is a rectangular structure. Two guide rails 11 are symmetrically distributed along the horizontal midline on the left side of the base 1. A positioning pin 12 is provided on the right side of the guide rail 11. A limit assembly fixing hole 13 is provided on the right side of the positioning pin 12. A positioning bead 14 is provided on the right side of the limit assembly fixing hole 13. A hinge assembly fixing hole 17 is provided on the right side of the positioning bead 14. Support plates 15 are provided on both the upper and lower sides of the limit assembly fixing hole 13, and bearing assemblies 16 are provided on the outer sides of the support plates 15.

[0033] The support plate 15 is a rectangular plate, and threaded holes are arranged on the support plate 15. The bearing assembly 16 includes a bearing and a bearing seat, the bearing is installed in the bearing seat, and bolt holes are evenly distributed around the bearing seat, and the bearing seat is fixed to the support plate 15 by bolts.

[0034] like Figure 2 As shown, the positioning pin 12 is cylindrical, and a plurality of positioning holes are provided on the base 1. The positioning pin 12 can be inserted or pressed into the positioning hole to position the workpiece and prevent the workpiece from moving. If the position needs to be adjusted, the positioning pin 12 can be taken out and inserted into a different positioning hole for reuse.

[0035] The first end of the positioning bead 14 is provided with an external thread, and the first end of the positioning bead 14 is connected to the base 1 through the external thread, and the second end of the positioning bead 14 is a ball. The ball contacts the pressing plate 7, restricts the pressing plate 7 from moving downward, and plays a stop positioning role. The height of the positioning bead 14 is selected according to the size of the workpiece, and the positioning bead 14 is provided in no less than two groups.

[0036] There are at least two groups of positioning pins 12 , and the distance between the upper end surface of the positioning pins 12 and the upper surface of the base 1 is not greater than the distance between the second end of the positioning bead 14 and the upper surface of the base 1 .

[0037] The bottom of the angle adjustment component 2 is connected to the guide rail 11, and the angle adjustment component 2 can slide linearly along the guide rail 11. Figure 3 , Figure 3 The present invention is a schematic diagram of the angle adjustment assembly structure of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention. The angle adjustment assembly 2 includes a bottom plate 21, a roller assembly 22, a side plate 23, a first hydraulic cylinder connection block 24, a hydraulic cylinder 25, and a second hydraulic cylinder connection block 26. The bottom plate 21 is fixed on the guide rail 11. Two roller assemblies 22 are symmetrically distributed along the horizontal center line on the right side of the bottom plate 21. Pins are provided on the upper and lower sides of the right side of the side plate 23. The side plate 23 is connected to the roller assembly 22 through the pins and can rotate around the pins. A second hydraulic cylinder connection block 26 is provided at the horizontal center line position on the left side of the bottom plate 21, and the bottom of the hydraulic cylinder 25 is rotatably connected to the second hydraulic cylinder connection block 26. A first hydraulic cylinder connection block 24 is provided at the horizontal center line position at the bottom of the side plate 23, and the first hydraulic cylinder connection block 24 is rotatably connected to the piston rod of the hydraulic cylinder 25.

[0038] When the angle of the side plate 23 needs to be adjusted, the hydraulic cylinder 25 is started, and the piston rod of the hydraulic cylinder 25 drives the side plate 23 to rotate, thereby completing the angle adjustment.

[0039] See also Figure 7 , Figure 7 The schematic diagram of the installation structure of the limit assembly and the cam handle of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention is shown. The limit assembly 3 includes a first cylindrical pin 31, a nut 32 and a first spring 33. The first end of the first cylindrical pin 31 is provided with an external thread, and the second end is an arc-shaped surface. The external thread of the first end of the first cylindrical pin 31 is connected to the fixing hole 13 of the limit assembly. The first cylindrical pin 31 is also provided with a nut 32. The nut 32 cooperates with the external thread of the first end of the first cylindrical pin 31 to fix the first cylindrical pin 31 on the base 1. The first spring 33 is provided on the first cylindrical pin 31 and is arranged between the nut 32 and the pressure plate 7.

[0040] See also Figure 4 , Figure 4The present invention is a schematic diagram of the structure of a screw rod adjustment assembly of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention. The screw rod adjustment assembly 4 includes a first connecting plate 41, a second connecting plate 42, a screw rod 43, a screw rod nut 44, a turntable 45 and a fixing ring 46. The bottom of the first connecting plate 41 is fixed to the left side of the base 1, and a screw rod nut 44 is fixed to the middle position of the first connecting plate 41. The bottom of the second connecting plate 42 is connected to the angle adjustment assembly 2, and a round hole is provided in the middle of the second connecting plate 42. The first end of the screw rod 43 is connected to the turntable 45, and the second end of the screw rod 43 is smooth. The second end of the screw rod 43 passes through the screw rod nut 44 and the round hole of the second connecting plate 42. A fixing ring 46 is provided on the left and right sides of the middle round hole of the second connecting plate 42. The fixing ring 46 is connected to the second end of the screw rod 43 to limit the left and right movement of the screw rod 43. The second end of the screw rod 43 can rotate in the middle round hole of the second connecting plate 42.

[0041] When the angle adjustment assembly 2 needs to be moved, the turntable 45 is rotated, and the turntable 45 drives the screw rod 43 to slide linearly left and right along the screw rod nut 44 , and the second end of the screw rod 43 drives the angle adjustment assembly 2 to slide linearly along the guide rail 11 .

[0042] like Figure 1 As shown, the first end of the hinge assembly 5 is connected to the hinge assembly fixing hole 17, and at least two sets of hinge assemblies 5 and hinge assembly fixing holes 17 are provided correspondingly. The number of support assemblies 6 is provided correspondingly to the number of hinge assemblies 5, and the support assemblies 6 can rotate around the hinge assembly 5 as the center.

[0043] See also Figure 5 , Figure 5 This is a schematic diagram of the support assembly structure of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention. The support assembly 6 includes a fixed plate 61, a spring connecting block 62, a second cylindrical pin 63 and a second spring 64. The spring connecting block 62 is arranged on the left side of the fixed plate 61. A circular hole is opened in the center of the spring connecting block 62 and the fixed plate 61. The first end of the second cylindrical pin 63 is provided with an external thread. The pressing plate 7 is fixedly connected to the external thread of the first end of the second cylindrical pin 63. The second end of the second cylindrical pin 63 passes through the circular holes on the spring connecting block 62 and the fixed plate 61, and can slide in the circular holes on the spring connecting block 62 and the fixed plate 61. The second spring 64 is mounted on the second cylindrical pin 63. The first end of the second spring 64 is fixedly connected to the spring connecting block 62, and the second end of the second spring 64 is fixedly connected to the pressing plate 7.

[0044] See also Figure 6 , Figure 6This is a schematic diagram of the pressure plate structure of a positioning fixture for assembling a grain dryer according to an embodiment of the present invention. A through hole 71 is opened in the middle of the pressure plate 7. The cross-section of the bottom left side of the pressure plate 7 is a continuous W-shape. A blind hole 72 is provided on the right side of the pressure plate 7. An internal thread is provided in the blind hole 72. The second end of the first cylindrical pin 31 passes through the through hole 71 in the middle of the pressure plate 7 and is movably connected to the cam handle 8. The inner diameter of the through hole 71 is larger than the outer diameter of the first cylindrical pin 31. The bottom of the pressure plate 7 contacts the first spring 33. The first spring 33 is deformed when the pressure plate 7 is forced to move downward. After the external force on the pressure plate 7 is removed, the first spring 33 lifts the pressure plate 7 to facilitate the removal of the workpiece.

[0045] like Figure 1 As shown, the right side of the pressing plate 7 is fixedly connected to the first end of the second cylindrical pin 63 of the support assembly 6. When the pressing plate 7 is lifted by the first spring 33, it drives the support assembly 6 to rotate around the hinge assembly 5, and the second end of the second cylindrical pin 63 slides in the circular holes on the spring connecting block 62 and the fixing plate 61. The right end surface of the pressing plate 7 is fixedly connected to the second end of the second spring 64. Because the inner diameter of the through hole 71 on the pressing plate 7 is larger than the outer diameter of the first cylindrical pin 31, when the pressing plate 7 presses the workpiece, the elastic force generated by the pressure of the second spring 64 prevents the pressing plate 7 from shaking and damaging the surface of the workpiece.

[0046] For workpieces with high requirements on appearance, such as spray-painted parts and sheet metal parts, the pressing plate 7 can be made of a hard plastic sheet to prevent the appearance of the workpiece from being scratched or damaged.

[0047] like Figure 7 As shown, the cam handle 8 includes a cam portion 81, a handle portion 82 and a shaft 83, and the handle portion 82 is fixed on the cam portion 81. Figure 8 As shown, both ends of the shaft rod 83 are connected to the bearing assembly 16 on the base 1, and the bottom of the cam portion 81 contacts the upper surface of the pressure plate 7. An accommodating chamber 84 is provided inside the cam portion 81, and circular holes are provided on both sides of the accommodating chamber 84. The shaft rod 83 passes through the circular holes and is fixedly connected to the cam portion 81. A sleeve 85 is provided in the accommodating chamber 84, and the first end of the sleeve 85 is connected to the shaft rod 83 and can rotate around the shaft rod 83. A waist-shaped hole is opened at the bottom of the accommodating chamber 84, and the second end of the limit assembly 3 passes through the waist-shaped hole and extends into the second end of the sleeve 85. The second end of the limit assembly 3 can slide up and down in the second end of the sleeve 85.

[0048] By turning the cam handle 8, the curvature radius of the contact point between the bottom of the cam portion 81 and the pressing plate 7 changes continuously. During the up and down movement of the pressing plate 7, the second end of the first cylindrical pin 31 of the limiting assembly 3 passes through the through hole 71 in the middle of the pressing plate 7 and slides up and down in the second end of the sleeve 85. The sleeve 85 can rotate around the shaft 83 to prevent the first cylindrical pin 31 and the sleeve 85 from getting stuck during the clamping or loosening process.

[0049] Workpiece positioning and clamping: Place the workpiece on the base 1, adjust the angle of the side plate 23, place one end of the workpiece against the positioning pin 12, rotate the turntable 45 to move the angle adjustment assembly 2 so that the other end of the workpiece contacts the side plate 23, and position the workpiece. Then press the cam handle 8 clockwise, and the radius of curvature of the contact point between the cam portion 81 and the pressure plate 7 changes from small to large, and the pressure plate 7 presses the workpiece downward. The W-shaped cross section of the pressure plate 7 can increase the friction with the workpiece and prevent the workpiece from detaching. For workpieces of different sizes, the position of the positioning pin 12 and the angle adjustment assembly 2 can be adjusted to meet the use requirements.

[0050] Workpiece removal: After assembly is completed, the cam handle 8 is pushed up counterclockwise, the radius of curvature of the contact point between the cam portion 81 and the pressure plate 7 changes from large to small, the pressure plate 7 is lifted up by the first spring 33, and the workpiece can be removed.

[0051] The positioning, clamping and workpiece removal operations are convenient, fast and efficient. The positions of the positioning pin 12 and the angle adjustment assembly 2 can be adjusted to meet the assembly positioning of different workpieces of the grain dryer, increasing the scope of use of the clamp. The pressing plate 7 of different materials can also be selected to ensure the appearance quality of the workpiece.

[0052] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A positioning fixture for assembling a grain dryer, characterized in that: include: Base (1); An angle adjustment component (2) is arranged on the left side of the base (1) and is slidably connected to the base (1); A limiting component (3), wherein a first end of the limiting component (3) is fixed on the base (1); A screw rod adjustment assembly (4), wherein a first end of the screw rod adjustment assembly (4) is fixed to the base (1), and a second end of the screw rod adjustment assembly (4) is connected to the angle adjustment assembly (2); A hinge assembly (5), wherein a first end of the hinge assembly (5) is fixed to the right side of the base (1); A support assembly (6) fixed to the second end of the hinge assembly (5), one side of the support assembly (6) being connected to the pressure plate (7); A cam handle (8) connected to the base (1) and arranged above the pressure plate (7); Wherein, the second end of the limiting assembly (3) passes through the pressing plate (7) and is movably connected to the cam handle (8); The support assembly (6) comprises a fixing plate (61), a spring connection block (62), a second cylindrical pin (63) and a second spring (64), wherein the spring connection block (62) is arranged on the left side of the fixing plate (61), a circular hole is opened in the center of the spring connection block (62) and the fixing plate (61), a first end of the second cylindrical pin (63) is provided with an external thread, the pressing plate (7) is fixedly connected to the external thread of the first end of the second cylindrical pin (63), the second end of the second cylindrical pin (63) passes through the circular holes on the spring connection block (62) and the fixing plate (61), and can slide in the circular holes on the spring connection block (62) and the fixing plate (61), the second spring (64) is sleeved on the second cylindrical pin (63), the first end of the second spring (64) is fixedly connected to the spring connection block (62), and the second end of the second spring (64) is fixedly connected to the pressing plate (7); A guide rail (11) is symmetrically distributed along the horizontal midline on the left side of the base (1); the bottom of the angle adjustment component (2) is connected to the guide rail (11); a positioning pin (12) is provided on the right side of the guide rail (11); a limit component fixing hole (13) is provided on the right side of the positioning pin (12); a first end of the limit component (3) is connected to the limit component fixing hole (13); a positioning bead (14) is provided on the right side of the limit component fixing hole (13); a hinge component fixing hole (17) is provided on the right side of the positioning bead (14); a first end of the hinge component (5) is connected to the hinge component fixing hole (17); support plates (15) are provided on the upper and lower sides of the limit component fixing hole (13); bearing assemblies (16) are provided on the outer sides of the support plates (15); and the cam handle (8) is connected to the bearing assembly (16); The cam handle (8) comprises a cam portion (81), a handle portion (82) and a shaft (83); the handle portion (82) is fixed to the cam portion (81); both ends of the shaft (83) are fixed to the bearing assembly (16); the bottom of the cam portion (81) contacts the upper surface of the pressure plate (7); a receiving cavity (84) is provided inside the cam portion (81); round holes are provided on both sides of the receiving cavity (84); the shaft (83) passes through the round holes and is in contact with the bearing assembly (16); The cam portion (81) is fixedly connected, a sleeve (85) is arranged in the accommodating cavity (84), a first end of the sleeve (85) is connected to the shaft (83), the sleeve (85) can rotate around the shaft (83), a waist-shaped hole is opened at the bottom of the accommodating cavity (84), the second end of the limiting component (3) passes through the waist-shaped hole and extends into the second end of the sleeve (85), and the second end of the limiting component (3) can slide up and down in the second end of the sleeve (85).

2. The positioning fixture for assembling a grain dryer according to claim 1, characterized in that: The limiting assembly (3) comprises a first cylindrical pin (31), a nut (32) and a first spring (33); the first end of the first cylindrical pin (31) is provided with an external thread, and the second end is an arc-shaped surface; the external thread of the first end of the first cylindrical pin (31) is connected to the fixing hole (13) of the limiting assembly; the first cylindrical pin (31) is also sleeved with the nut (32); the nut (32) cooperates with the external thread of the first end of the first cylindrical pin (31) to fix the first cylindrical pin (31) on the base (1); the first spring (33) is sleeved on the first cylindrical pin (31); and the first spring (33) is arranged between the nut (32) and the pressure plate (7).

3. The positioning fixture for assembling a grain dryer according to claim 2, characterized in that: A through hole (71) is formed in the middle of the pressure plate (7), and the second end of the first cylindrical pin (31) passes through the through hole (71) and is movably connected to the cam handle (8). The inner diameter of the through hole (71) is greater than the outer diameter of the first cylindrical pin (31).

4. The positioning fixture for assembling a grain dryer according to claim 3, characterized in that: The cross section of the left bottom of the pressing plate (7) is a continuous W-shape.

5. The positioning fixture for assembling a grain dryer according to claim 1, characterized in that: The angle adjustment assembly (2) comprises a bottom plate (21), a roller assembly (22), a side plate (23), a first hydraulic cylinder connection block (24), a hydraulic cylinder (25), and a second hydraulic cylinder connection block (26); the bottom plate (21) is fixed on the guide rail (11); two roller assemblies (22) are symmetrically distributed along a horizontal midline on the right side of the bottom plate (21); pins are arranged on the upper and lower sides of the right side of the side plate (23); the side plate (23) is connected to the roller assembly (22) via the pins and can rotate around the pins; the second hydraulic cylinder connection block (26) is arranged at the horizontal midline position on the left side of the bottom plate (21); the bottom of the hydraulic cylinder (25) is rotatably connected to the second hydraulic cylinder connection block (26); the first hydraulic cylinder connection block (24) is arranged at the horizontal midline position on the bottom of the side plate (23); the first hydraulic cylinder connection block (24) is rotatably connected to the piston rod of the hydraulic cylinder (25).

6. The positioning fixture for assembling a grain dryer according to claim 1, characterized in that: The screw adjustment assembly (4) comprises a first connecting plate (41), a second connecting plate (42), a screw (43), a screw nut (44), a rotating disk (45) and a fixing ring (46); the bottom of the first connecting plate (41) is fixed to the left side of the base (1); the screw nut (44) is fixed at the middle position of the first connecting plate (41); the bottom of the second connecting plate (42) is connected to the angle adjustment assembly (2); a round hole is provided in the middle of the second connecting plate (42); the first end of the screw (43) is connected to the rotating disk (45); the second end of the screw (43) is smooth; the second end of the screw (43) passes through the screw nut (44) and the round hole of the second connecting plate (42); the fixing ring (46) is provided on the left and right sides of the round hole in the middle of the second connecting plate (42); the fixing ring (46) is connected to the second end of the screw (43); the second end of the screw (43) can rotate in the round hole in the middle of the second connecting plate (42).

7. The positioning fixture for assembling a grain dryer according to claim 1, characterized in that: The distance between the upper end surface of the positioning pin (12) and the upper surface of the base (1) is no greater than the distance between the second end of the positioning bead (14) and the upper surface of the base (1).

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