Horizontal oil cylinder inner and outer barrel pre-assembly platform

Abstract

The utility model relates to the technical field of sleeve assembly, and discloses a horizontal oil cylinder inner and outer barrel pre-assembly platform which comprises a bottom table, an inner barrel welding auxiliary structure and an outer barrel adjusting auxiliary structure, the inner barrel welding auxiliary structure comprises a crimping rod and two limiting plates oppositely arranged on the bottom table in a spaced mode, and each limiting plate is provided with a through hole; the two through holes are opposite to each other, and the crimping rod can penetrate through the two opposite through holes in the two limiting plates in a limiting manner and is crimped on a first inner cylinder side plate of a to-be-welded inner cylinder placed on the bottom table; the outer barrel adjusting auxiliary structure comprises two positioning plates which are oppositely parallel and arranged on the bottom table in a spaced mode, the two positioning plates are both perpendicular to the bottom table, a positioning groove is formed between the two positioning plates and the bottom table, a semi-formed outer barrel can be placed in the positioning groove and matched with the positioning groove, and the two second outer barrel side plates correspond to the two positioning plates respectively. The two second outer cylinder side plates can be separated under stress to be attached to the two positioning plates respectively. The inner cylinder welding quality is good, and the inner and outer cylinder assembling efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of sleeve assembly technology, and in particular to a pre-assembly platform for the inner and outer cylinders of a horizontal hydraulic cylinder. Background Technology

[0002] Large vehicles typically require outriggers for support and improved overall stability during operation. Outriggers are generally driven by hydraulic cylinders, allowing them to lower or raise to support the ground or retract. To further enhance the practicality of the outriggers, horizontal cylinders are also installed. Each end of the horizontal cylinder is connected to a telescopic outrigger, driving changes in the distance between the two telescopic outriggers to adapt to different support environments and requirements. The horizontal cylinder has inner and outer cylinders that are fitted together. During manufacturing, the inner cylinder needs to be fitted inside the outer cylinder. In existing technology, the inner and outer cylinders are first welded separately, and then transferred to subsequent welding and assembly processes for further welding operations. The inner cylinder is often prepared by manually holding the steel plate during welding, which is prone to displacement, affecting welding efficiency and quality. Furthermore, due to production errors, the internal dimensions of the outer cylinder may be smaller than the inner cylinder dimensions, leading to assembly failures in subsequent processes, impacting production efficiency and wasting materials. Utility Model Content

[0003] Based on the above, the purpose of this utility model is to provide a pre-assembly platform for the inner and outer cylinders of a horizontal hydraulic cylinder, which has better welding quality of the inner cylinder and higher assembly efficiency of the inner and outer cylinders.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A horizontal hydraulic cylinder inner and outer cylinder pre-assembly platform is used for pre-assembling the inner cylinder and an open semi-formed outer cylinder, and adjusting the internal dimensions of the semi-formed outer cylinder. The open semi-formed outer cylinder includes a first outer cylinder side plate and two second outer cylinder side plates connected to opposite sides of the first outer cylinder side plate. The platform is characterized in that it comprises:

[0006] Platform;

[0007] The inner cylinder welding auxiliary structure includes a pressing rod and two limiting plates that are spaced apart on the base platform. Each limiting plate has a through hole, and the two through holes face each other. The pressing rod can be limited to pass through the two through holes facing each other on the two limiting plates and press against the first inner cylinder side plate of the inner cylinder to be welded placed on the base platform.

[0008] The outer cylinder adjustment auxiliary structure includes two relatively parallel and spaced positioning plates on the base platform. Both positioning plates are perpendicular to the base platform, and a positioning groove is formed between the two positioning plates and the base platform. The semi-formed outer cylinder can be placed in the positioning groove and is adapted to the positioning groove. Two second outer cylinder side plates correspond to the two positioning plates respectively, and the two second outer cylinder side plates can be separated by force to abut against the two positioning plates respectively.

[0009] As a preferred embodiment of a horizontal cylinder inner and outer cylinder pre-assembly platform, each of the limiting plates has two through holes spaced apart along the height direction. The two through holes on one limiting plate are directly opposite to the two through holes on the other limiting plate. Two pressing rods are provided. After the two second inner cylinder side plates of the inner cylinder to be welded are welded to the first inner cylinder side plate, the third inner cylinder side plate of the inner cylinder to be welded is placed on the two second inner cylinder side plates above the first inner cylinder side plate. The other pressing rod can be limited and passed through the other two through holes and pressed against the third inner cylinder side plate.

[0010] As a preferred embodiment of a horizontal cylinder inner and outer cylinder pre-assembly platform, each of the limiting plates includes an intermediate plate and reinforcing plates that are angled together and connected to both sides of the intermediate plate, and the intermediate plate is provided with the through hole.

[0011] As a preferred embodiment of a pre-assembly platform for the inner and outer cylinders of a horizontal hydraulic cylinder, the inner cylinder welding auxiliary structure further includes multiple positioning plates. The size of the through hole is larger than the size of the pressing rod. At least one of the positioning plates can be placed between the pressing rod and one of the through holes to restrict the movement of the pressing rod in the through hole.

[0012] As a preferred embodiment of a pre-assembly platform for the inner and outer cylinders of a horizontal hydraulic cylinder, the inner cylinder welding auxiliary structure further includes at least two positioning rods. Each of the two limiting plates has a lug on its opposite side. The lug is located above the through hole. The end of the lug facing the base has an arc-shaped groove that is directly opposite the through hole. One of the positioning rods can be forcefully inserted into the arc-shaped groove and the through hole and pressed against the positioning plate.

[0013] As a preferred embodiment of a pre-assembly platform for the inner and outer cylinders of a horizontal hydraulic cylinder, the inner cylinder welding auxiliary structure further includes a positioning frame. The positioning frame is disposed on the base platform and includes multiple positioning plates spaced apart along a first direction. Two limiting plates are spaced apart along the first direction, and the first inner cylinder side plate and the third inner cylinder side plate can abut against the positioning plates.

[0014] As a preferred embodiment of a horizontal cylinder inner and outer cylinder pre-assembly platform, a connecting rod is connected between each two adjacent positioning plates, and the connecting rod is spaced apart from the base platform. When the third inner cylinder side plate is placed on the two second inner cylinder side plates, its height on the base platform is lower than that of the connecting rod.

[0015] As a preferred embodiment of a pre-assembly platform for the inner and outer cylinders of a horizontal hydraulic cylinder, the outer cylinder adjustment auxiliary structure further includes multiple reinforcing inclined plates, at least one of which is connected between a positioning plate and the base platform.

[0016] As a preferred embodiment of a horizontal cylinder inner and outer cylinder pre-assembly platform, each positioning plate includes a positioning side plate and a support plate vertically connected to the upper end of the positioning side plate. The support plate is parallel to the base platform, and the support plate and the positioning side plate are L-shaped. The reinforcing inclined plate is connected between the support plate, the positioning side plate and the base platform.

[0017] The beneficial effects of this utility model are as follows:

[0018] This utility model provides a pre-assembly platform for the inner and outer cylinders of a horizontal hydraulic cylinder. When the outer cylinder is not fully formed, the open, semi-formed outer cylinder is placed in a positioning groove. The welded inner cylinder is then inserted into the semi-formed outer cylinder for trial assembly. If it cannot be inserted, force is applied to the two second outer cylinder side plates. Due to the perpendicularity of the positioning plates to the base, the force can increase the opening between the two second outer cylinder side plates until they are respectively against the two positioning plates, i.e., perpendicular or nearly perpendicular to the first outer cylinder side plate. During the adjustment process, the inner cylinder can be trial-assembled multiple times until it can be inserted into the semi-formed outer cylinder. Then, the semi-formed outer cylinder is sealed and welded to form the formed outer cylinder, ensuring the success of subsequent assembly. If the inner cylinder still cannot be inserted into the semi-formed outer cylinder even when the opening of the two second outer cylinder side plates is at its maximum, it indicates that the production size error of the inner or outer cylinder is too large, making it unsuitable for continuing the subsequent assembly process. This helps to save transfer work and subsequent assembly preparation work, thereby improving production efficiency. The inner cylinder is prepared by welding with the assistance of the inner cylinder welding auxiliary structure. Under the pressure limiting action of the pressing rod, the first side plate is not easy to move. This makes it easy for operators to directly weld other side plates on the fixed first side plate without the need for additional manpower to hold the first side plate. This also helps to improve welding quality and efficiency. In addition, the internal dimensions of the semi-formed outer cylinder can be adjusted by the outer cylinder adjustment auxiliary structure. This ensures that the inner cylinder can be smoothly inserted into the outer cylinder before the outer cylinder is closed to form the finished outer cylinder. This avoids the situation where the inner cylinder cannot be assembled due to slight dimensional differences after the straight outer cylinder is welded, which would otherwise result in low production efficiency and waste of raw materials. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the semi-formed outer cylinder with an opening provided in an embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of the inner cylinder provided in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the outer cylinder provided in an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of the inner and outer cylinder sleeve provided in an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the horizontal cylinder inner and outer cylinder pre-assembly platform from one perspective, provided by an embodiment of the present invention;

[0025] Figure 6 This is a top view of the horizontal cylinder inner and outer cylinder pre-assembly platform provided in this embodiment of the utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the pressing rod pressing the first inner cylinder side plate provided in this embodiment of the utility model;

[0027] Figure 8 This is a structural schematic diagram of the horizontal cylinder inner and outer cylinder pre-assembly platform from another perspective, provided by an embodiment of this utility model.

[0028] In the picture:

[0029] 1. Base platform; 2. Inner cylinder welding auxiliary structure; 21. Press rod; 22. Limiting plate; 220. Through hole; 221. Intermediate plate; 222. Reinforcing plate; 23. Positioning piece; 24. Positioning round rod; 25. Ear platform; 250. Arc groove; 26. Positioning frame; 261. Positioning backing plate; 262. Connecting rod; 3. Outer cylinder adjustment auxiliary structure; 31. Positioning plate; 311. Positioning side plate; 312. Support plate; 30. Positioning groove; 32. Reinforcing inclined plate; 100. Inner cylinder; 101. First inner cylinder side plate; 102. Second inner cylinder side plate; 103. Third inner cylinder side plate; 200. Outer cylinder; 201. First outer cylinder side plate; 202. Second outer cylinder side plate. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are merely used for descriptive distinction and have no special meaning.

[0034] like Figures 1 to 8As shown, this embodiment provides a pre-assembly platform for the inner and outer cylinders 200 of a horizontal hydraulic cylinder. This pre-assembly platform is used to pre-assemble the inner cylinder 100 and the open semi-formed outer cylinder 200, and to adjust the internal dimensions of the semi-formed outer cylinder 200. The open semi-formed outer cylinder 200 includes a first outer cylinder side plate 201 and two second outer cylinder side plates 202 connected to opposite sides of the first outer cylinder side plate 201. Specifically, the pre-assembly platform for the inner and outer cylinders 200 of the horizontal hydraulic cylinder includes a base platform 1, an inner cylinder welding auxiliary structure 2, and an outer cylinder adjustment auxiliary structure 3. The inner cylinder welding auxiliary structure 2 includes a pressing rod 21 and two limiting plates 22 that are spaced apart on the base platform 1. Each limiting plate 22 has a through hole 220. The two through holes 220 face each other. The pressing rod 21 can be limited to pass through the two through holes 220 facing each other on the two limiting plates 22, and press against the first through hole 220 of the inner cylinder 100 to be welded placed on the base platform 1. An inner cylinder side plate 101; an outer cylinder adjustment auxiliary structure 3 includes two relatively parallel and spaced positioning plates 31 on a base platform 1. Both positioning plates 31 are perpendicular to the base platform 1, and a positioning groove 30 is formed between the two positioning plates 31 and the base platform 1. The semi-formed outer cylinder 200 can be placed in the positioning groove 30 and is adapted to the positioning groove 30. Two second outer cylinder side plates 202 correspond to the two positioning plates 31 respectively. The two second outer cylinder side plates 202 can be separated by force to abut against the two positioning plates 31 respectively.

[0035] Before the outer cylinder 200 is fully formed, place the open, semi-formed outer cylinder 200 in the positioning groove 30. Then, insert the welded inner cylinder 100 into the semi-formed outer cylinder 200. If insertion is impossible, apply force to the two second outer cylinder side plates 202. Due to the perpendicularity of the positioning plate 31 to the base 1, the applied force increases the opening between the two second outer cylinder side plates 202 until they are against the two positioning plates 31, i.e., perpendicular or nearly perpendicular to the first outer cylinder side plate 201. Multiple trial installations of the inner cylinder 100 can be performed during the adjustment process. The inner cylinder 100 is inserted into the semi-formed outer cylinder 200 until it can be inserted into the semi-formed outer cylinder 200. Then, the semi-formed outer cylinder 200 is sealed and welded to form the formed outer cylinder 200, ensuring the success of subsequent assembly. If the inner cylinder 100 still cannot be inserted into the semi-formed outer cylinder 200 even when the opening of the two second outer cylinder side plates 202 is adjusted to the maximum, it indicates that the production size error of the inner cylinder 100 or the outer cylinder 200 is too large, and it is not suitable to continue the subsequent assembly process. This helps to save transfer work and subsequent assembly preparation work, thereby improving production efficiency. The inner cylinder 100 is prepared by welding with the assistance of the inner cylinder welding auxiliary structure 2. Under the pressing and limiting action of the pressing rod 21, the first side plate is not easy to move, which makes it easy for the operator to directly perform welding operations on the other side plates on the fixed first side plate without the need for additional manpower to hold the first side plate, and it is conducive to improving welding quality and efficiency. Moreover, the internal dimensions of the semi-formed outer cylinder 200 with the opening can be adjusted by the outer cylinder adjustment auxiliary structure 3, ensuring that the inner cylinder 100 can be smoothly inserted into the outer cylinder 200 before the outer cylinder 200 is closed to form the formed outer cylinder 200. This avoids the situation where the inner cylinder 100 cannot be assembled due to slight dimensional differences after the straight outer cylinder 200 is welded and formed, resulting in low production efficiency and waste of raw materials.

[0036] In this embodiment, as Figure 7 As shown, the inner cylinder welding auxiliary structure 2 also includes multiple positioning pieces 23. The size of the through hole 220 is larger than the size of the crimping rod 21. At least one positioning piece 23 can be placed between the crimping rod 21 and a through hole 220 to restrict the movement of the crimping rod 21 in the through hole 220. When welding the inner cylinder 100, the first inner cylinder side plate 101 is first placed on the base platform 1. Then, a pressing rod 21 is passed through two opposing through holes 220. The pressing rod 21 is pressed on the first inner cylinder side plate 101. Then, by inserting one or more positioning pieces 23 into each through hole 220, there is no gap between the pressing rod 21 and the through hole 220 in the height direction, that is, the position of the pressing rod 21 is fixed, ensuring that the pressing rod 21 presses the first inner cylinder side plate 101 tightly, so that the first inner cylinder side plate 101 will not easily shift, slip or shake under force. The operator then places the second inner cylinder side plate 102 of the inner cylinder 100 to be welded on the first inner cylinder side plate 101 and welds it. During the welding process, no additional stabilization operation is required for the first inner cylinder side plate 101. It is only necessary to stabilize the second inner cylinder side plate 102, which helps to improve welding efficiency and welding quality.

[0037] Preferably, the inner cylinder welding auxiliary structure 2 further includes at least two positioning rods 24. Each of the two limiting plates 22 has an ear platform 25 on its opposite side. The ear platform 25 is located above the through hole 220. One end of the ear platform 25 facing the base 1 has an arc-shaped groove 250 directly opposite the through hole 220. One positioning rod 24 can be forcefully inserted into the arc-shaped groove 250 and the through hole 220 and pressed against the positioning piece 23. After the positioning piece 23 is inserted into the pressing rod 21 and the upper edge of the through hole 220, the positioning rod 24 is further inserted into the arc-shaped groove 250 and the through hole 220 to further press the positioning piece 23, thereby pressing the pressing rod 21. In actual operation, the positioning rod 24 is hammered into the arc-shaped groove 250 and the through hole 220 using a hammering tool to ensure the positional stability of the positioning rod 24, the positioning piece 23, and the pressing rod 21 in the through hole 220. After welding is completed, the positioning rod 24 is hammered out using a hammering tool.

[0038] After welding the two second inner cylinder side plates 102 onto the first inner cylinder side plate 101, the third inner cylinder side plate 103 of the inner cylinder 100 to be welded is placed on the side of the two second inner cylinder side plates 102 away from the first inner cylinder side plate 101, that is, the third inner cylinder side plate 103 is located directly above the first inner cylinder side plate 101. Then the third inner cylinder side plate 103 is welded onto the two second inner cylinder side plates 102 to complete the preparation of the inner cylinder 100. To further improve the welding quality of the inner cylinder 100, two through holes 220 are spaced apart along the height direction on each limiting plate 22. The two through holes 220 on one limiting plate 22 are directly opposite to the two through holes 220 on the other limiting plate 22. Two pressing rods 21 are provided. After the two second inner cylinder side plates 102 of the inner cylinder 100 to be welded are welded onto the first inner cylinder side plate 101, the third inner cylinder side plate 103 of the inner cylinder 100 to be welded is placed on the two second inner cylinder side plates 102 above the first inner cylinder side plate 101. The other pressing rod 21 can be limited and inserted through the other two through holes 220 and pressed onto the third inner cylinder side plate 103. That is, after the third inner cylinder side plate 103 is placed in place, the pressing rod 21 is used to press and position the third inner cylinder side plate 103, ensuring the positional stability of the third inner cylinder side plate 103 during the welding process and preventing it from shifting or falling off the second inner cylinder side plate 102.

[0039] In this embodiment, after a crimping rod 21 crimps the third inner cylinder side plate 103, it is also pressed tightly by inserting one or more positioning pieces 23. Preferably, each through hole 220 corresponds to one lug 25, and four positioning rods 24 are provided. The four positioning rods 24 correspond one-to-one with the four through holes 220. The crimping rod 21 crimped on the third inner cylinder side plate 103 is pressed tightly by the positioning rods 24 and the positioning pieces 23 to ensure the welding quality of the third inner cylinder side plate 103.

[0040] When the positioning piece 23 and the positioning rod 24 are inserted, the limiting plate 22 is subjected to a certain impact force. In order to ensure the reliability of the use of the limiting plate 22, each limiting plate 22 includes a middle plate 221 and reinforcing plates 222 connected at an angle to both sides of the middle plate 221, preferably vertically connected. The middle plate 221 is provided with a through hole 220. The reinforcing plates 222 on both sides provide good support and reinforcement for the middle plate 221, so that the limiting plate 22 has a better load-bearing capacity.

[0041] To further improve the welding quality of the inner cylinder 100, the inner cylinder welding auxiliary structure 2 also includes a positioning frame 26. The positioning frame 26 is set on the base platform 1 and includes multiple positioning plates 261 spaced apart along a first direction and two limiting plates 22 spaced apart along the first direction. The first inner cylinder side plate 101 and the third inner cylinder side plate 103 can abut against the positioning plates 261. When placing the first inner cylinder side plate 101 and the third inner cylinder side plate 103, the first inner cylinder side plate 101 and the third inner cylinder side plate 103 abut against the positioning plates 261. That is, the positioning plates 261 provide a positioning function for the first inner cylinder side plate 101 and the third inner cylinder side plate 103, so that the first inner cylinder side plate 101 and the third inner cylinder side plate 103 are placed accurately, thereby improving welding quality and efficiency.

[0042] Preferably, a connecting rod 262 connects each pair of adjacent positioning plates 261. The connecting rod 262 is spaced apart from the base platform 1. When the third inner cylinder side plate 103 is placed on the two second inner cylinder side plates 102, its height on the base platform 1 is lower than that of the connecting rod 262. The connecting plate helps to improve the structural stability of the two adjacent positioning plates 261, and the height setting of the connecting rod 262 can avoid interference with the welding of the third inner cylinder side plate 103, ensuring smooth welding.

[0043] Furthermore, such as Figure 8 As shown, the outer cylinder adjustment auxiliary structure 3 also includes multiple reinforcing inclined plates 32, at least one of which is connected between a positioning plate 31 and the base platform 1. The reinforcing inclined plate 32 provides support for the positioning plate 31, thereby enhancing the load-bearing capacity of the positioning plate 31. That is, when adjusting the semi-formed outer cylinder 200, the positioning plate 31 with better structural strength is less prone to deformation and damage, and has a longer service life.

[0044] Preferably, each positioning plate 31 includes a positioning side plate 311 and a support plate 312 vertically connected to the upper end of the positioning side plate 311. The support plate 312 is parallel to the base platform 1, and the support plate 312 and the positioning side plate 311 are L-shaped. A reinforcing inclined plate 32 connects the support plate 312, the positioning side plate 311, and the base platform 1. The L-shaped connection of the support plate 312 and the positioning side plate 311 has better structural strength and stability, and also makes the supporting effect of the reinforcing inclined plate 32 better, thereby further improving the reliability of the positioning plate 31.

[0045] Alternatively, the positioning plate 31 can also be U-shaped, with the openings of the two U-shaped plates facing away from each other, which helps to increase the connection area and connection strength between the positioning plate 31 and the base platform 1.

[0046] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A horizontal hydraulic cylinder inner and outer cylinder pre-assembly platform for pre-assembling the inner cylinder and an open semi-formed outer cylinder, and adjusting the internal dimensions of the semi-formed outer cylinder, wherein the open semi-formed outer cylinder includes a first outer cylinder side plate and two second outer cylinder side plates connected to opposite sides of the first outer cylinder side plate, characterized in that, The horizontal cylinder inner and outer cylinder pre-assembly platform includes: Platform; The inner cylinder welding auxiliary structure includes a pressing rod and two limiting plates that are spaced apart on the base platform. Each limiting plate has a through hole, and the two through holes face each other. The pressing rod can be limited to pass through the two through holes facing each other on the two limiting plates and press against the first inner cylinder side plate of the inner cylinder to be welded placed on the base platform. The outer cylinder adjustment auxiliary structure includes two relatively parallel and spaced positioning plates on the base platform. Both positioning plates are perpendicular to the base platform, and a positioning groove is formed between the two positioning plates and the base platform. The semi-formed outer cylinder can be placed in the positioning groove and is adapted to the positioning groove. Two second outer cylinder side plates correspond to the two positioning plates respectively, and the two second outer cylinder side plates can be separated by force to abut against the two positioning plates respectively.

2. The horizontal cylinder inner and outer cylinder pre-assembly platform according to claim 1, characterized in that, Each of the limiting plates has two through holes spaced apart along the height direction. The two through holes on one limiting plate are directly opposite to the two through holes on the other limiting plate. There are two pressing rods. After the two second inner cylinder side plates of the inner cylinder to be welded are welded to the first inner cylinder side plate, the third inner cylinder side plate of the inner cylinder to be welded is placed on the two second inner cylinder side plates above the first inner cylinder side plate. The other pressing rod can be limited and passed through the other two through holes and pressed against the third inner cylinder side plate.

3. The horizontal cylinder inner and outer cylinder pre-assembly platform according to claim 1, characterized in that, Each of the limiting plates includes a middle plate and reinforcing plates that are angled together and connected to both sides of the middle plate, and the middle plate has the through hole.

4. The horizontal cylinder inner and outer cylinder pre-assembly platform according to claim 1, characterized in that, The inner cylinder welding auxiliary structure also includes multiple positioning plates. The size of the through hole is larger than the size of the crimping rod. At least one of the positioning plates can be placed between the crimping rod and one of the through holes to restrict the movement of the crimping rod in the through hole.

5. The horizontal cylinder inner and outer cylinder pre-assembly platform according to claim 4, characterized in that, The inner cylinder welding auxiliary structure also includes at least two positioning rods. Each of the two limiting plates has an ear platform on its opposite side. The ear platform is located above the through hole. The end of the ear platform facing the base is provided with an arc-shaped groove that is directly opposite the through hole. One of the positioning rods can be forcefully inserted into the arc-shaped groove and the through hole and pressed against the positioning piece.

6. The horizontal cylinder inner and outer cylinder pre-assembly platform according to claim 2, characterized in that, The inner cylinder welding auxiliary structure also includes a positioning frame, which is disposed on the base platform. The positioning frame includes a plurality of positioning plates spaced apart along a first direction, and two limiting plates spaced apart along the first direction. The first inner cylinder side plate and the third inner cylinder side plate can abut against the positioning plates.

7. The horizontal cylinder inner and outer cylinder pre-assembly platform according to claim 6, characterized in that, A connecting rod is connected between each pair of adjacent positioning plates. The connecting rod is spaced apart from the base platform. When the third inner cylinder side plate is placed on the two second inner cylinder side plates, its height on the base platform is lower than that of the connecting rod.

8. The horizontal cylinder inner and outer cylinder pre-assembly platform according to claim 1, characterized in that, The outer cylinder adjustment auxiliary structure also includes multiple reinforcing inclined plates, at least one of which is connected between a positioning plate and the base.

9. The horizontal cylinder inner and outer cylinder pre-assembly platform according to claim 8, characterized in that, Each of the positioning plates includes a positioning side plate and a support plate vertically connected to the upper end of the positioning side plate. The support plate is parallel to the base platform. The support plate and the positioning side plate are L-shaped. The reinforcing inclined plate is connected between the support plate, the positioning side plate and the base platform.

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