Crankshaft packaging box

Abstract

The utility model relates to the technical field of crankshaft packaging, and discloses a crankshaft packaging box which comprises an outer packaging layer and an inner packaging part arranged in the outer packaging layer, a plurality of containing cavities used for containing crankshafts are formed in the inner packaging part, and a positioning structure is inserted into the inner packaging part in a straight line mode. The positioning structure is provided with positioning parts which extend into the containing cavities from the bottoms and anti-rotation parts which are connected to the positioning parts and used for preventing the crankshaft from rotating. The positioning part is used for supporting the crankshafts, and the anti-rotation part is used for supporting crankshaft journals from the side lower portions of the crankshafts, so that after the crankshaft packaging box is filled with the crankshafts, the crankshaft journals, located on the anti-rotation part, of the crankshafts can be pressed on the inner packaging part or the outer packaging layer above the crankshaft journals, and therefore positioning of the crankshafts is achieved only through the action of supporting; according to the crankshaft packaging box, the crankshaft is prevented from shaking and rotating, so that the crankshaft packaging box capable of well positioning the crankshaft is assembled in a simplest combination and insertion mode, and compared with the prior art, the crankshaft packaging box is simpler in structure, small in assembly difficulty and low in cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of crankshaft packaging, particularly to a crankshaft packaging box. BACKGROUND

[0002] The crankshaft is one of the five core components of the internal combustion engine, and can convert the reciprocating linear motion of the piston into the circumferential rotary motion of the crankshaft after cooperating with the connecting rod, and transmit the force of the piston to the output shaft to drive other components of the automobile engine to work. The specific working principle of the crankshaft is: bearing the force transmitted by the connecting rod, and converting it into torque, which is output through the crankshaft and drives other accessories on the engine to work. At the same time, the crankshaft is also subjected to the combined action of centrifugal force of rotating mass, periodically changing gas inertia force and reciprocating inertia force, which makes the crankshaft subjected to bending and torsional load.

[0003] Before the crankshaft is formally assembled in the internal combustion engine, in order to meet the demand of the crankshaft in various places, the crankshaft needs to be packaged and transported to various places. The crankshaft journal structure is complex, but the whole is columnar. Without any measures, the crankshaft is easy to roll in the packaging box, which causes the crankshaft to collide with the packaging box or even collide with the external structure during transportation. In order to ensure the integrity of the crankshaft during packaging and transportation, and to avoid damage caused by bumping during transportation, affecting the quality and appearance of the crankshaft, the existing crankshaft packaging box is adhered with a plurality of support blocks with different shapes in the packaging box to match the journal structure of the crankshaft to support and prevent the crankshaft from rolling. However, in order to save cost to the greatest extent, a plurality of crankshafts need to be placed in a packaging box, so a plurality of cavities need to be spaced out in the packaging box. In order to prevent the crankshaft from rolling, a plurality of support blocks with different shapes need to be arranged in each cavity. The preparation of support blocks with different shapes will increase the cost and reduce the efficiency, and the support blocks need to be connected one by one in the cavity during the assembly of the packaging box, which will increase the cost and cause trouble in assembly. SUMMARY

[0004] In view of the above problems of the prior art, the technical problem to be solved by the utility model is to provide a crankshaft packaging box to solve the problems of high cost and troublesome assembly of the existing crankshaft packaging box.

[0005] To solve the above technical problems, one technical scheme of the utility model is to provide a crankshaft packaging box comprising an outer packaging layer and an inner packaging part arranged in the outer packaging layer. A plurality of placing cavities for placing the crankshaft are formed in the inner packaging part. A positioning structure is inserted in the inner packaging part in a line. The positioning structure has a positioning part extending into each placing cavity from the bottom and a rotation prevention part connected to the positioning part to prevent the crankshaft from rotating.

[0006] Further, the placement cavities are equally divided into at least one group, each group of the placement cavities is sequentially distributed along a transverse direction, and each group of the placement cavities is provided with a positioning structure.

[0007] Further, the placement cavities are provided as a group, the positioning structure is provided as one and includes two lower support sheets which are spaced apart along a longitudinal direction perpendicular to the transverse direction, the two lower support sheets are inserted into the bottom of the inner packaging part in a single line, and the positioning parts are formed in the two lower support sheets corresponding to each placement cavity.

[0008] Further, the positioning part includes a positioning plate extending into the placement cavity from the bottom of the placement cavity and a positioning groove corresponding to the profile of the crankshaft and formed in the positioning plate in a recessed manner, the positioning groove is open upward and communicates along the longitudinal direction.

[0009] Further, the lower support sheet includes at least two secondary plates which are connected in a stacked manner along the longitudinal direction.

[0010] Further, the inner packaging part is provided as a plurality of parts and is placed in the outer packaging layer in a stacked manner along the height direction, a layer plate is arranged between adjacent inner packaging layers; each inner packaging part includes a plurality of first clamping grids which are spaced apart in a parallel manner along the transverse direction and are supported on the layer plate or the outer packaging layer, and a plurality of second clamping grids which are spaced apart in a parallel manner along the longitudinal direction and are supported on the layer plate, each first clamping grid is inserted into each second clamping grid in a single line to enclose a plurality of placement cavities.

[0011] Further, a first insertion opening is formed in the top side edge of the lower support sheet corresponding to the position of each first clamping grid, a second insertion opening is formed in the bottom side edge of each first clamping grid and is inserted into the first insertion opening in a single line, and the part of the lower support sheet between any two adjacent first insertion openings is configured as the positioning part.

[0012] Further, the anti-rotation part includes two anti-rotation pads corresponding to each placement cavity, the two anti-rotation pads press and hold the connecting rod journal on the outer packaging layer or the adjacent layer plate when the crankshaft is placed on the positioning part, the two anti-rotation pads are arranged on the side of the placement cavity away from the two lower support sheets, and the two anti-rotation pads are respectively attached to the first clamping grid, the lower support sheet and the layer plate.

[0013] Further, the outer packaging layer includes a tray, a bottom cover supported on the top of the tray, a surrounding plate supported on the inner side of the bottom cover to enclose the outer side of the inner packaging part, and an upper cover covered on the top of the surrounding plate.

[0014] Further, the surrounding plate comprises a side plate folded to form a square, a connecting plate connected to one end of the side plate, and a connecting buckle, a buckle slot is formed on a side of the side plate away from the connecting plate and corresponding to a position of the connecting buckle; the connecting buckle comprises a buckle part with a nail column and a nail needle, and a screw, a screw hole is formed on the nail column, the nail column penetrates through the connecting plate and extends into the buckle slot, the nail needle penetrates into the connecting plate, and the screw is screwed on the side plate and has a head abutting against the side plate.

[0015] The crankshaft packaging box has at least the following beneficial effects: the positioning structure is arranged on the inner packaging part, when the crankshaft is installed in the inner packaging part, the positioning part is used for supporting the crankshaft, the anti-rotation part is used for supporting the crankshaft journal from the lower side of the crankshaft, after the crankshaft packaging box is filled with the crankshafts, the crankshaft journal of each crankshaft on the anti-rotation part can be pressed and held on the inner packaging part or the outer packaging layer above, so that the positioning of the crankshafts is realized only by the supporting action, the crankshafts are prevented from shaking and rotating, and the crankshaft packaging box capable of better positioning the crankshafts is assembled in the form of the plug-in connection with the simplest combination, the structure is simpler than that of the prior art, the assembly difficulty is small, and the cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application, and do not limit the application. In the drawings:

[0017] Figure 1 It is a structural schematic view of the crankshaft packaging box of the utility model;

[0018] Figure 2 It is an explosion view of the inner packaging part (hidden anti-rotation part) of the utility model;

[0019] Figure 3 It is a structural schematic view of the crankshaft packaging box (hidden upper cover) of the utility model;

[0020] Figure 4 It is a structural schematic view of the inner packaging part (hidden one second clamping plate) of the utility model;

[0021] Figure 5 It is an explosion view of the inner packaging part (hidden anti-rotation part) of the utility model;

[0022] Figure 6 It is a structural schematic view of the surrounding plate of the utility model;

[0023] Figure 7 It is a partial top view of the surrounding plate of the utility model.

[0024] The meanings of the reference signs in the drawings are as follows:

[0025] The outer packaging layer 1, the tray 11, the base 111, the bottom plate 112, the bottom cover 12, the bottom side plate 121, the surrounding plate 13, the side plate 131, the buckle groove 1311, the connecting plate 132, the connecting buckle 133, the nail column 1331, the nail needle 1332, the screw 1333, the end head 1334, the upper cover 14, the inner packaging part 2, the layer plate 21, the first clamping lattice plate 22, the third socket 221, the second clamping lattice plate 23, the fourth socket 231, the placing cavity 24, the end plate 25, the anti-collision space 26, the positioning structure 3, the lower supporting sheet 31, the secondary plate 311, the first socket 312, the positioning part 32, the positioning plate 321, the positioning groove 322, and the anti-rotation part 33. DETAILED DESCRIPTION

[0026] The utility model will be further described below in combination with the drawings.

[0027] The crankshaft comprises a main shaft neck, a positioning structure, a connecting rod shaft neck, a crank, and the like structure, and the crankshaft is prior art, and the specific structure and distribution are not described here.

[0028] Please refer to Figures 1 to 7 The utility model discloses a crankshaft packaging box comprising an outer packaging layer 1, an inner packaging part 2 arranged in the outer packaging layer 1 and a positioning structure 3 arranged in the inner packaging part 2. The outer packaging layer 1 is used for protecting the inner packaging part 2 and the crankshaft, so as to package multiple crankshafts at the same time. The inner packaging part 2 provides double protection for the crankshaft, thereby increasing the safety of the crankshaft. Meanwhile, the inner packaging part 2 can preliminarily fix the crankshaft with special-shaped structure, thereby ensuring the stability of each crankshaft when multiple crankshafts are arranged at the same time. The positioning structure 3 supports the crankshaft from the main shaft neck of the crankshaft. The cooperation between the positioning structure 3 and the crank, the positioning structure 3 and the like prevents the crankshaft from shaking greatly in the axial direction. The positioning structure 3 lifts the connecting rod shaft neck, thereby preventing the crankshaft from rolling.

[0029] In the embodiment, the outer packaging layer 1 comprises a tray 11, a bottom cover 12 supported on the top of the tray 11, a surrounding plate 13 supported on the inner side of the bottom cover 12 to surround the outer side of the inner packaging part 2, and an upper cover 14 arranged on the top of the surrounding plate 13. The tray 11 is used for supporting other structures of the packaging box and the crankshaft. The bottom cover 12 is used for supporting the inner packaging part 2 and the surrounding plate 13, so as to facilitate the installation of the surrounding plate 13 and the inner packaging part 2. The upper cover 14 cooperates with the surrounding plate 13 to wrap the inner packaging part 2 and the crankshaft in the outer packaging layer 1. Meanwhile, the separate upper cover 14 facilitates the taking and placing of the crankshaft.

[0030] In the content defined by the embodiment, the tray 11 comprises a plurality of parallel and spaced apart bases 111 and a bottom plate 112 connected to the top surface of the bases 111, and the bottom cover 12 is supported on the bottom plate 112 so as to be spaced apart from the ground or any placement platform, preventing the crankshaft in the packaging box from being damaged by the ground impact during the lifting and placing process. In the embodiment, the base 111 is in the structure of a cuboid long strip, the length, width and height of each base 111 are the same and the two ends are aligned. The base 111 comprises two pads and a plurality of cushion blocks fixedly connected between the two pads, the cushion blocks are arranged at intervals and at least two cushion blocks are arranged on the two ends of the pad. The bottom plate 112 is in the structure of a square sheet, the base 111 is fixedly connected to the bottom surface of the bottom plate 112 and the two ends are flush with the corresponding two side edges of the bottom plate 112. Among them, a threading space is formed between any two adjacent bases 111, the threading space is convenient for the packing rope to pass through to pack the packaging box, and at the same time, the threading space is also convenient for the forks of the transfer equipment such as a forklift to pass through to move the packaging box of the packaging crankshaft. Since the crankshaft has a certain weight, the material of the tray 11 is selected to be a high-rigidity hard material such as plywood, alloy, etc.

[0031] In the content defined by the embodiment, the bottom cover 12, the surrounding plate 13, the upper cover 14, the inner packaging part 2 and the positioning structure 3 are all made of corrugated paper, which not only has low cost, but also is energy-saving, environment-friendly and recyclable. The bottom cover 12 comprises a bottom plate in the shape of a rectangle and bottom side plates 121 folded upward from the four side edges of the bottom plate, and the adjacent bottom side plates 121 are connected by adhesion, nailing or the like. The height of the bottom side plate 121 is much smaller than the height of the surrounding plate 13, and the bottom side plates 121 surround a bottom space between the bottom plate 112, which is adapted to the surrounding plate 13 so that the bottom cloth of the surrounding plate 13 can be placed in the bottom space. In another embodiment, the bottom cover 12, the surrounding plate 13, the upper cover 14, the inner packaging part 2 and the positioning structure 3 can also be made of wood, alloy or the like, which are not limited to the embodiment.

[0032] In the content defined by the embodiment, the surrounding plate 13 corresponds to the four bottom side plates 121 and is formed by folding a rectangular corrugated paperboard into a square side plate 131. The surrounding plate 13 further includes a connecting plate 132 connected to one end of the side plate 131 and a connecting buckle 133. One end of the side plate 131 is folded to one side of the connecting plate 132 and connected to the connecting plate 132 through the connecting buckle 133. The side plate 131 and the connecting plate 132 are integrally formed, and the connecting plate 132 and the side plate 131 have the same size in the height direction. The width of the connecting plate 132 is smaller than the width of the part of the side plate 131 corresponding to each bottom side plate 121, so as to be used only for the connection of the side plate 131. In an embodiment, the connecting buckle 133 is provided as at least two and is distributed along the height direction. In another embodiment, the connecting buckle 133 is provided as three and is distributed along the height direction on the connecting plate 132. On the side of the side plate 131 away from the connecting plate 132, a buckle slot 1311 is formed at the position corresponding to the number and position of the connecting buckle 133. The buckle slot 1311 is communicated to the side away from the side plate 131 in the direction parallel to the side of the side plate 131, and the buckle slot 1311 is communicated in the direction perpendicular to the side of the side plate 131 to form a U-shaped notch on the side plate 131, so that the connecting buckle 133 can be inserted into the notch through the opening side. In another embodiment, the buckle slot 1311 can be only a through hole penetrating the side plate 131 in the direction perpendicular to the side plate 131 where the buckle slot 1311 is located. The connecting buckle 133 includes a buckle part having a nail column 1331 and a nail needle 1332, and a screw 1333. The buckle part is T-shaped and has an end head 1334 and the nail column 1331 with a diameter smaller than the end head 1334. The end head 1334 and the nail column 1331 are coaxially distributed, and the diameter of the end head 1334 is greater than the width or diameter of the buckle slot 1311, so that the end head 1334 cannot pass through the buckle slot 1311. The diameter of the nail column 1331 is smaller than or equal to the width or diameter of the buckle slot 1311, so that the nail column 1331 can be inserted into the buckle slot 1311. The length of the nail column 1331 is smaller than or equal to the sum of the thicknesses of the side plate 131 and the connecting plate 132. A screw hole is formed on the end of the nail column 1331 away from the end head 1334. After the side plate 131 is folded into a square and the side of the side plate 131 having the buckle slot 1311 is stacked with the connecting plate 132, the end head 1334 is located outside the surrounding plate 13, the screw 1333 is located inside the surrounding plate 13, and the screw 1333 is screwed into the screw hole. Since the screw 1333 has a head, the screw 1333 is screwed into the screw hole until the head abuts against the side plate 131, thereby achieving the connection of the surrounding plate 13. After the bottom of the surrounding plate 13 is placed in the bottom space, each surrounding plate 13 is attached to each bottom side plate 121. The width of the surrounding plate 13 is at least one time the height of the inner packaging part 2, so as to ensure that at least one inner packaging part 2 can be loaded. Usually, the width of the surrounding plate 13 is at least two times the height of the inner packaging part 2, and the width of the surrounding plate 13 is always an integer multiple of the height of the inner packaging part 2.

[0033] In the content defined by the embodiment, the upper cover 14 is arranged in the same way as the bottom cover 12 and surrounds a top space which is the same as the bottom space and has an opening side located on the opposite side. The upper cover 14 is arranged on the top of the baffle 13 through the top space, and the top of the baffle 13 extends into the top space and abuts against the upper cover 14.

[0034] In the embodiment, the inner packaging part 2 is arranged in several parts, each of which is stacked in the outer packaging layer 1 in the height direction. The bottommost inner packaging part 2 is supported on the bottom cover 12, and the other inner packaging parts 2 are all supported on the top of the inner packaging part 2 below to support each other. In order to ensure the installation between adjacent inner packaging parts 2, a layer plate 21 is arranged between any two adjacent inner packaging parts 2 to support the inner packaging part 2 above. Each inner packaging part 2 includes a plurality of first clamping plates 22 supported on the layer plate 21 and a plurality of second clamping plates 23 supported on the layer plate 21, each of which is perpendicular to the first clamping plate 22. The first clamping plate 22 and the second clamping plate 23 are connected to each other in a cross shape in a way of one-character insertion to surround a plurality of placement cavities 24, and the crankshaft is placed in each placement cavity 24 corresponding to the number of placement cavities 24. In use, after the spliced inner packaging part 2 is placed on the bottom cover 12 and in the baffle 13, the crankshaft is placed in the placement cavity 24 in sequence, and the inner packaging part 2 protects and preliminarily limits the crankshaft relative to the baffle 13. In the embodiment, each of the first clamping plate 22 and the second clamping plate 23 is rectangular, the length, width and height of each first clamping plate 22 are the same, the length, width and height of each second clamping plate 23 are the same, and the height (the size in the height direction) of each first clamping plate 22 and the second clamping plate 23 is the same.

[0035] In the embodiment, the plurality of placement cavities 24 are divided into at least one group as needed, each group of placement cavities 24 is sequentially distributed along a transverse direction or a vertical direction, and each group of placement cavities 24 is provided with a positioning structure 3. In an embodiment, the placement cavities 24 are provided as a group and each placement cavity 24 is sequentially distributed along a transverse direction, and the positioning structure 3 is provided as one. Specifically, the first clamping lattices 22 are provided as four pieces, the second clamping lattices 23 are provided as two pieces, and the third sockets 221 are concavely provided on the bottom side edges of the first clamping lattices 22 corresponding to the positions of the two second clamping lattices 23, both of the third sockets 221 penetrate the first clamping lattices 22 in a direction perpendicular to the first clamping lattices 22 and are connected downward. The fourth sockets 231 are concavely provided on the top side edges of the two second clamping lattices 23 corresponding to the positions of each first clamping lattice 22, and there are four fourth sockets 231 penetrating the second clamping lattices 23 in a direction perpendicular to the second clamping lattices 23 and connected upward. The two third sockets 221 are distributed at both ends of the bottom side edges of the first clamping lattices 22, and the sum of the lengths of the third socket 221 and the fourth socket 231 is equal to the height of the first clamping lattice 22 and the second clamping lattice 23. When assembled, the four first clamping lattices 22 are inserted into the two second clamping lattices 23 through the two third sockets 221 and one fourth socket 231 to form a cross shape, and finally all the first clamping lattices 22 and the second clamping lattices 23 are inserted into each other to form the inner packaging part 2 and enclose three placement cavities 24. In another embodiment, the first clamping lattices 22 are provided as four pieces, the second clamping lattices 23 are provided as three pieces, and the connection mode is consistent with the previous embodiment to enclose two groups of placement cavities 24, the two groups of placement cavities 24 are sequentially distributed along the longitudinal direction, and each group of placement cavities 24 has three placement cavities 24 along the transverse direction, and the positioning structure 3 is provided as two. The number of first clamping lattices 22 and second clamping lattices 23 is not limited to this embodiment, and other numbers of first clamping lattices 22 and second clamping lattices 23 can also be used, but it is necessary to ensure that the first clamping lattices 22 and the second clamping lattices 23 are provided as at least two pieces, so as to ensure that at least one placement cavity 24 can be enclosed. The top and bottom of the first clamping lattices 22 and the second clamping lattices 23 after being inserted through the third socket 221 and the fourth socket 231 are flush. Among them, the side where the first clamping lattice 22 is located is the length of the placement cavity 24, the side where the second clamping lattice 23 is located is the width of the placement cavity 24, and the placement cavity 24 needs to be enclosed to form a rectangular cuboid shape. The placement cavity 24 needs to be ensured to be adapted to the crankshaft, so that the side wall of the crankshaft fits the inner wall of the placement cavity 24, thereby preventing the crankshaft from rolling. In the embodiment, the transverse direction refers to the direction of the width of the placement cavity 24, and the longitudinal direction refers to the direction of the length of the placement cavity 24.

[0036] In the embodiment, in order to avoid the impact of the surrounding plate 13 on the crankshaft in the placing cavity 24 due to the collision with the outer shell during transportation, the end plate 25 is formed outside each placing cavity 24, i.e., outside the inner packaging part 2, by inserting the two ends of each first clamping grid plate 22 and each second clamping grid plate 23 in a straight line. When the surrounding plate 13 is arranged on the inner packaging part 2, the end plate 25 is arranged on the inner side of the surrounding plate 13 of the outer packaging layer 1. The end plate 25 supports the surrounding plate 13 and the inner packaging part 2, and forms the anti-collision space 26 between the inner packaging part 2 and the outer packaging layer 1, so that the surrounding plate 13 and the first clamping grid plate 22 and the second clamping grid plate 23 are separated from the end plate 25, thereby greatly reducing the impact on the crankshaft when the surrounding plate 13 is collided.

[0037] In the embodiment, the positioning structure 3 is connected to the inner packaging part 2 by cross insertion, which is easy to assemble by simple insertion compared with the prior art by pasting. The positioning structure 3 includes two longitudinally parallel and spaced lower support plates 31, a positioning part 32 formed on the lower support plate 31, and an anti-rotation part 33 connected to the positioning part 32. The lower support plate 31 is used to provide support for the positioning part 32 and is connected to the first clamping grid plate 22. The positioning part 32 is used to extend into the placing cavity 24 from the bottom of the placing cavity 24 to support the crankshaft. The anti-rotation part 33 is used to support the connecting rod journal, so that the balance block and the crank are limited, thereby preventing the crankshaft from rotating. The two lower support plates 31 are in the form of rectangular strip structure. In order to ensure the strength of the lower support plate 3, each lower support plate 31 includes at least two secondary plates 311 connected in longitudinal stacking, so as to increase the thickness of the lower support plate 31 made of corrugated paper and increase the strength. In the embodiment, each lower support plate 31 includes two secondary plates 311. In another embodiment, each lower support plate 31 includes three secondary plates 311. Regardless of the embodiment, the thickness of the lower support plate 31 should be less than the length of the connecting rod journal.

[0038] In the embodiment, the two lower support plates 31 are inserted into the bottom of the first clamping plate 22 of the inner packaging part 2 in a cross shape in the insertion direction to complete the assembly and connection. The top side of the lower support plate 31 is provided with a first insertion hole 312 corresponding to the position of each first clamping plate 22, and the bottom side of each first clamping plate 22 is provided with a second insertion hole 222 inserted into the first insertion hole 312 in a line, and the part of the lower support plate 31 between any two adjacent first insertion holes 312 is configured as a positioning part 32 to form three positioning parts 32. Due to the design of the first insertion hole 312, the two sides of each positioning part 32 abut against the first clamping plate 22 to support the crankshaft while improving the strength of the first clamping plate 22. The positioning part 32 includes a positioning plate 321 of the part of the lower support plate 31 between the two first insertion holes 312 and a positioning groove 322 recessed from the top side of the positioning plate 321 and adapted to the contour of the main journal of the crankshaft, and the positioning plate 321 is inserted into the placement cavity 24 from the bottom of the placement cavity 24 under the influence of the two first insertion holes 312. The positioning groove 322 is an arc-shaped groove opening upward and longitudinally communicating. During assembly, the crankshaft is placed in the longitudinal direction, and the two main journals are arranged at the positions corresponding to the two main journals of the lower support plate 31 so that the two main journals are placed in the positioning groove 322, and the crank is distributed in the placement cavity 24. The depth of the placement cavity 24 is adapted to the width of the crankshaft so that the upper cover 14 or other inner packaging part 2 above the crankshaft is pressed after the crankshaft is installed. The two ends of the lower support plate 31 extend into the anti-collision space 26 and abut against the surrounding plate 13.

[0039] In the present embodiment, the anti-rotation part 33 includes two anti-rotation pads corresponding to each placement cavity 24, i.e. two anti-rotation pads are arranged in each placement cavity 24, and the two anti-rotation pads in each placement cavity 24 press the connecting rod journal against the anti-rotation pad on the outer packaging layer 1 or the adjacent layer plate 21 when the crankshaft is placed on the positioning part 32. The presence of the connecting rod journal makes one end of the crankshaft small and the other end large, therefore, the anti-rotation pad elevates the small end to balance the other end and is pressed against the inner packaging part 2 or the upper cover 14 above it to prevent the crankshaft from rotating. The two anti-rotation pads are arranged on the side of the placement cavity 24 away from the two lower support pieces 31 to correspond to the positions of the two connecting rod journals, and the two anti-rotation pads are respectively attached to the first clamping grid plate 22, the lower support piece 31 and the layer plate 21 by pasting to ensure the stability of the anti-rotation pad. Only the anti-rotation pad needs to use additional connecting materials for connection, and the rest of the parts are connected by inserting the positioning structure 3 into the inner packaging part 2, thereby greatly simplifying the assembly difficulty and preparation cost of the packaging box. It should be noted that the anti-rotation pad is also formed in a stacked manner by folding corrugated paper sheets. In another embodiment, the anti-rotation pad can be pasted on the lower support piece 31 before the lower support piece 31 is inserted into the first clamping grid plate 22, and when assembling, the positioning structure 3 can be inserted into the inner packaging part 2 when assembling the inner packaging part 2, thereby completing the assembly, and the positioning structure 3 does not need to be separately arranged in each placement cavity 24 for fixing the crankshaft, thereby greatly simplifying the assembly difficulty and improving the assembly efficiency.

Claims

1. A crankshaft packaging box comprising an outer packaging layer and an inner packaging part arranged in the outer packaging layer, a plurality of placement cavities for placing crankshafts are formed in the inner packaging part, characterized in that: The inner packaging part is provided with a positioning structure which is inserted into the inner packaging part in a straight line, and the positioning structure is provided with a positioning part which extends into each placement cavity from the bottom and an anti-rotation part which is connected to the positioning part to prevent the rotation of the crankshaft.

2. The crankshaft packaging case according to claim 1, characterized by: The placement cavities are divided into at least one group, and each group of the placement cavities is sequentially distributed along a transverse direction.

3. The crankshaft packaging case according to claim 2, characterized by: The placement cavities are arranged in a group, and the positioning structure is arranged in one and includes two lower support plates which are parallel and spaced apart along a longitudinal direction which is perpendicular to the transverse direction, and the two lower support plates are inserted into the bottom of the inner packaging part in a straight line, and the positioning part is formed on the two lower support plates corresponding to each placement cavity.

4. The crankshaft packaging case according to claim 3, characterized by: The positioning part includes a positioning plate which extends into the placement cavity from the bottom of the placement cavity and a positioning groove which is formed by recessing the top side of the positioning plate and is matched with the profile of the crankshaft, and the positioning groove is open upward and is communicated along the longitudinal direction.

5. The crankshaft packaging case according to claim 3 or 4, characterized by: The lower support plate includes at least two secondary plates which are connected in a stack along the longitudinal direction.

6. The crankshaft packaging case according to claim 5, wherein: The inner packaging parts are arranged in a plurality and are stacked in the outer packaging layer along the height direction, and the adjacent inner packaging layers are provided with a layer plate; each inner packaging part includes a plurality of first clamping plates which are parallel and spaced apart along the transverse direction and are supported on the layer plate or the outer packaging layer, and a plurality of second clamping plates which are parallel and spaced apart along the longitudinal direction and are supported on the layer plate, and each first clamping plate is inserted into each second clamping plate in a straight line to enclose a plurality of placement cavities.

7. The crankshaft packaging case according to claim 6, characterized by: The top side of the lower support plate is provided with a first insertion hole corresponding to the position of each first clamping plate, and the bottom side of each first clamping plate is provided with a second insertion hole which is inserted into the first insertion hole in a straight line, and the part of the lower support plate between any two adjacent first insertion holes is configured as the positioning part.

8. The crankshaft packaging case according to claim 7, characterized by: The anti-rotation part corresponding to each placement cavity includes two anti-rotation pads which press the connecting rod journal on the outer packaging layer or the adjacent layer plate when the crankshaft is placed on the positioning part, and the two anti-rotation pads are arranged on the side of the placement cavity which is away from the two lower support plates, and the two anti-rotation pads are respectively attached to the first clamping plate, the lower support plate and the layer plate.

9. The crankshaft packaging case of claim 1, wherein: The outer packaging layer includes a tray, a bottom cover which is supported on the top of the tray, a surrounding plate which is supported on the inner side of the bottom cover to enclose the outer side of the inner packaging part, and an upper cover which is arranged on the top of the surrounding plate.

10. The crankshaft packaging case according to claim 9, characterized by: The surrounding plate includes a side plate which is folded to form a square, a connecting plate which is connected to one end of the side plate, and a connecting buckle, and the side plate is provided with a buckle groove corresponding to the position of the connecting buckle on the side which is away from the connecting plate; the connecting buckle includes a buckle part which has a nail column and a nail needle and a screw, the nail column is provided with a screw hole, the nail column penetrates through the connecting plate and extends into the buckle groove, the nail needle penetrates into the connecting plate, and the screw is screwed into the side plate and has a head which abuts against the side plate.

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