Equipment for machining arc-shaped plate

Abstract

The utility model relates to equipment for machining an arc-shaped plate, and belongs to the technical field of arc-shaped plate production. The lower die comprises a left steel plate supporting seat, a right steel plate supporting seat and a middle supporting seat, the left steel plate supporting seat and the right steel plate supporting seat are oppositely arranged, the middle supporting seat is located between the left steel plate supporting seat and the right steel plate supporting seat, and the length direction of the left steel plate supporting seat, the length direction of the right steel plate supporting seat and the length direction of the middle supporting seat are consistent with the length direction of the arc-shaped stamping male die. A plurality of sets of top equal-height connecting blocks A connected with the left extrusion round roller are arranged on the upper portion of the left steel plate supporting seat at intervals in the length direction of the left steel plate supporting seat, and a plurality of sets of top equal-height connecting blocks B connected with the right extrusion round roller are arranged on the upper portion of the right steel plate supporting seat at intervals in the length direction of the right steel plate supporting seat. The forming die has the beneficial effects that the arc-shaped stamping male die presses a steel plate downwards and is matched with the left side extrusion round roller and the right side extrusion round roller of the lower die, so that the steel plate on the lower die is bent into an arc-shaped plate, and the forming efficiency is improved.

Description

Technical Field

[0001] The utility model relates to equipment for processing arc-shaped plates, belonging to the technical field of arc-shaped plate production. Background Art

[0002] In the stamping equipment in the prior art, for curved plates or curved parts with curved lines, the stamping operation of the stamping equipment on the curved plates and the majority of the structural settings of the stamping equipment are relatively simple. The cold stamping of the curved plates can be completed by setting the punch device of the stamping equipment to an arc-shaped structure and the corresponding grooves to an arc-shaped structure.

[0003] Patent number CN201820754000.4 discloses a device for cold stamping of arc-shaped plates, which includes a bottom stamping fixed seat and a stamping propulsion device arranged above the stamping fixed seat; the propulsion head of the stamping propulsion device is arranged vertically downward, and an arc-shaped stamping punch is installed at the end of the propulsion head; and the stamping fixed seat is provided with an arc-shaped die groove that matches the shape of the arc-shaped stamping punch.

[0004] Although the above patent can realize the exhaust function, the current technical considerations are not comprehensive and have the following disadvantages:

[0005] 1. The lower die does not have a left extrusion roller and a right extrusion roller, which affects the stamping quality and the success rate of the stamping.

[0006] 2. When stamping the curved plate, a stamping die is required. In the specific production of the factory, if the size of a certain type of curved plate may change after a period of production, a new die needs to be opened, which undoubtedly increases the production cost. Especially in the case where the precision requirements of the curved plate are not high, it is completely unnecessary to open a new high-precision die.

[0007] In order to solve one of the above problems, a device for processing curved plates is urgently needed. Utility Model Content

[0008] In view of the above deficiencies in the prior art, the technical problem to be solved by the utility model is: how to utilize the existing power unit to drive the arc-shaped stamping punch downward, the arc-shaped stamping punch presses the steel plate downward, and cooperates with the left extrusion roller and the right extrusion roller of the lower mold to bend the steel plate on the lower mold into an arc-shaped plate, and for this purpose, a device for processing arc-shaped plates is provided.

[0009] The equipment for processing curved plates described in the utility model comprises a lower mold installed on a base plate, and an arc-shaped stamping punch that can move up and down relative to the lower mold is arranged above the lower mold, and an existing power unit is used to drive the arc-shaped stamping punch to press down and cooperate with the lower mold to bend the steel plate on the lower mold into shape, and is characterized in that: the lower mold comprises a left steel plate support seat and a right steel plate support seat that are relatively arranged, and an intermediate support seat located between the left steel plate support seat and the right steel plate support seat, and the left steel plate support seat, the right steel plate support seat and the intermediate support seat are all consistent with the length direction of the arc-shaped stamping punch, and the upper part of the left steel plate support seat is provided with a plurality of groups of top contour connection blocks A connected to the left extrusion roller at intervals along its length direction, and the upper part of the right steel plate support seat is provided with a plurality of groups of top contour connection blocks B connected to the right extrusion roller at intervals along its length direction.

[0010] Multiple groups of top equal-height connection blocks A form a first support plane, and multiple groups of top equal-height connection blocks B form a second support plane. The steel plate to be processed is first supported on the first support plane and the second support plane, and then the arc-shaped punch is driven downward by the existing power unit. The arc-shaped punch presses the steel plate downward and cooperates with the left and right extrusion rollers of the lower mold to bend the steel plate on the lower mold into an arc-shaped plate. The rollers can rotate freely to reduce the required steel plate forming pressure.

[0011] Preferably, multiple groups of top equal-height connecting blocks A and multiple groups of top equal-height connecting blocks B are arranged at the same height, one end of the top equal-height connecting block A is fixed on the left steel plate support seat, and the upper part of the end surface of the other end is provided with a positioning groove A for installing the left extrusion roller, and one end of the top equal-height connecting block B is fixed on the right steel plate support seat, and the upper part of the end surface of the other end is provided with a positioning groove B for installing the right extrusion roller.

[0012] The existing power unit is used to drive the arc-shaped stamping punch downward, and the arc-shaped stamping punch presses the steel plate downward and cooperates with the left and right extrusion rollers of the lower die to bend the steel plate on the lower die into an arc-shaped plate.

[0013] Preferably, the left extrusion circular roller is arranged at the same height as the top equal-height connecting block A, and the left extrusion circular roller is in the positioning groove A, and can rotate relative to the top equal-height connecting block A; the right extrusion circular roller is arranged at the same height as the top equal-height connecting block B, and the right extrusion circular roller is in the positioning groove B, and can rotate relative to the top equal-height connecting block B.

[0014] The left extrusion circular roller can also be arranged slightly higher than the top equal-height connection block A, and the right extrusion circular roller can be arranged slightly higher than the top equal-height connection block B.

[0015] The intermediate support seat is supported on a bottom plate, or the intermediate support seat is suspended below the arc-shaped punching punch.

[0016] Preferably, the arc-shaped stamping punch includes a top mounting crossbeam connected to the power unit, a mounting plate is provided on the lower surface of the top mounting crossbeam along its length direction, a plurality of groups of detachable arc-shaped convex plates are equidistantly arranged along the length direction of the mounting plate, the bottom ends of each group of arc-shaped convex plates are arc-shaped with the same curvature, the middle support seat is a flat plate, and the two ends of the middle support seat are respectively suspended and connected to the two ends of the mounting plate by suspension belts, so as to lift the product when the arc-shaped stamping punch is raised, and provide support for the product when the arc-shaped stamping punch is pressed to the bottom.

[0017] The arc-shaped stamping punch adopts an arc-shaped convex plate that can be quickly disassembled and replaced. It has a simple structure and can be replaced with different sizes and specifications according to product needs.

[0018] Preferably, a side positioning mechanism is installed on the right steel plate support seat.

[0019] Preferably, the side positioning mechanism includes a stop beam and mutually parallel support beams A and B, one end of the support beam A and the support beam B are respectively fixed to the two ends of the right steel plate support seat, and the two ends of the stop beam are respectively installed on the upper surface of the support beam A and the support beam B in an adjustable manner.

[0020] When the steel plate to be processed is supported on the first supporting plane and the second supporting plane, one side edge of the steel plate is abutted against one side of the joist A to achieve positioning of the steel plate.

[0021] Preferably, both the support beam A and the support beam are channel steels with openings facing downwards, a first long hole is opened along the length direction of the support beam A, and a second long hole is opened along the length direction of the support beam B, a first bolt passes through the stop beam 4, and the first long hole connects the support beam A with the stop beam; the second bolt passes through the stop beam, and the second long hole connects the support beam B with the stop beam, and the position of the stop beam along the length direction of the support beams A and B is adjustable.

[0022] Preferably, the left steel plate support seat and the right steel plate support seat are both fixedly mounted on the upper surface of the base plate.

[0023] Preferably, a left steel plate support seat is adjustably installed on the upper surface position of one side of the base plate, and a right steel plate support seat is adjustably installed on the upper surface position of the other side of the base plate, so that the distance between the left steel plate support seat and the right steel plate support seat can be adjusted; the left extrusion circular roller and the right extrusion circular roller form a pair of circular rollers with adjustable spacing, and the production of arc plates of different diameters can be achieved by adjusting the spacing.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] The equipment for processing arc-shaped plates described in the utility model utilizes the existing power unit to drive the arc-shaped stamping punch downward, and the arc-shaped stamping punch presses the steel plate downward, and cooperates with the left extrusion roller and the right extrusion roller of the lower mold to bend the steel plate on the lower mold into an arc-shaped plate, thereby improving the forming efficiency.

[0026] In the equipment for processing arc-shaped plates of the utility model, the round rollers can rotate freely to reduce the required steel plate forming pressure.

[0027] The arc-shaped plate processing equipment of the utility model adopts an arc-shaped convex plate which can be quickly disassembled and replaced by an arc-shaped punching punch, has a simple structure, and can be replaced with different sizes and specifications according to product requirements.

[0028] The equipment for processing arc-shaped plates described in the utility model has two ends of the intermediate support seat respectively connected to the two ends of the mounting plate by chains or soft belts, and the intermediate support seat rises and falls with the arc-shaped stamping punch, lifts up the product when the arc-shaped stamping punch rises, and provides support for the product when the arc-shaped stamping punch is pressed to the bottom.

[0029] The equipment for processing arc-shaped plates described in the utility model has a left steel plate support seat adjustably installed on the upper surface position of one side of the base plate, and a right steel plate support seat adjustably installed on the upper surface position of the other side of the base plate, so that the distance between the left steel plate support seat and the right steel plate support seat can be adjusted; the left extrusion circular roller and the right extrusion circular roller form a pair of circular rollers with adjustable spacing, and the production of arc-shaped plates of different diameters can be achieved by adjusting the spacing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0031] Figure 1 The structure of the utility model is shown in FIG. Figure 1 (The arc-shaped punch is in the upper position);

[0032] Figure 2 The structure of the utility model is shown in FIG. Figure 2 (The arc-shaped punch is in the lower position);

[0033] Figure 3 The structure of the utility model is shown in FIG. Figure 3 (The arc-shaped punch is in the lower position);

[0034] Figure 4 This is a schematic diagram of the external structure of the lower mold of the utility model;

[0035] In the figure: 1, bottom plate 2, lower die 2.1, left steel plate support seat 2.2, right steel plate support seat 2.3, top equal height connection block A 2.4, top equal height connection block B 2.5, left extrusion round roller 2.6, right extrusion round roller 2.7, middle support seat 3, arc-shaped stamping punch 3.1, top mounting crossbeam 3.2, mounting plate 3.3, arc-shaped convex plate 4, stop crossbeam 5, support beam A6, steel plate. DETAILED DESCRIPTION

[0036] The utility model is further described below in conjunction with the accompanying drawings: The utility model is further illustrated below through specific embodiments, but is not intended to limit the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the invention should be included in the protection scope of the utility model.

[0037] Embodiment 1, as Figure 1-2 and Figure 4 As shown, the device for processing curved plates comprises a lower die 2 mounted on a bottom plate 1, an arc-shaped punch 3 is arranged above the lower die 2 and can move up and down relative to the lower die 2, an existing power unit is used to drive the arc-shaped punch 3 to press down and cooperate with the lower die 2, so that the steel plate 6 on the lower die 2 is bent and formed, and the lower die 2 comprises a left steel plate support seat 2.1 and a right steel plate support seat 2.2 which are arranged opposite to each other, and a right steel plate support seat 2.1 on the left steel plate support seat 2. 2, the left steel plate support seat 2.1, the right steel plate support seat 2.2 and the middle support seat 2.7 are all consistent with the length direction of the arc-shaped stamping punch 3, the upper part of the left steel plate support seat 2.1 is provided with a plurality of groups of top equal-height connecting blocks A2.3 connected to the left extrusion roller 2.5 at intervals along its length direction, and the upper part of the right steel plate support seat 2.2 is provided with a plurality of groups of top equal-height connecting blocks B2.4 connected to the right extrusion roller 2.6 at intervals along its length direction.

[0038] A plurality of groups of top equal-height connecting blocks A2.3 form a first supporting plane, and a plurality of groups of top equal-height connecting blocks B2.4 form a second supporting plane. The steel plate 6 to be processed is first supported on the first supporting plane, the second supporting plane and the upper surface of the intermediate supporting seat 2.7, and then the existing power unit is used to drive the arc-shaped stamping punch 3 downward. The arc-shaped stamping punch 3 presses down the steel plate 6 and cooperates with the left extrusion roller 2.5 and the right extrusion roller 2.6 of the lower mold 2 to bend the steel plate 6 on the lower mold 2 into an arc-shaped plate.

[0039] The rollers can rotate freely to reduce the required steel plate forming pressure.

[0040] The intermediate support seat 2.7 is supported on the base plate 1.

[0041] Embodiment 2, as Figure 1-2 and Figure 4 As shown, the device for processing an arc-shaped plate comprises a lower die 2 mounted on a bottom plate 1, an arc-shaped stamping punch 3 which can move up and down relative to the lower die 2 is arranged above the lower die 2, and an existing power unit is used to drive the arc-shaped stamping punch 3 to press down and cooperate with the lower die 2, so that the steel plate 6 on the lower die 2 is bent and formed, and the lower die 2 is a structure with a low middle and high sides along its extension direction, including a left steel plate support seat 2.1 and a right steel plate support seat 2.2 which are arranged relatively, and a left steel plate support seat 2.1 and a right steel plate support seat 2.2 between the left steel plate support seat 2.1 and the right steel plate support seat 2.2. The intermediate support seat 2.7 is suspended below the arc-shaped stamping punch 3. The left steel plate support seat 2.1, the right steel plate support seat 2.2 and the intermediate support seat 2.7 are all consistent with the length direction of the arc-shaped stamping punch 3. The upper part of the left steel plate support seat 2.1 is provided with a plurality of groups of top equal-height connecting blocks A2.3 connected to the left extrusion roller 2.5 at intervals along its length direction. The upper part of the right steel plate support seat 2.2 is provided with a plurality of groups of top equal-height connecting blocks B2.4 connected to the right extrusion roller 2.6 at intervals along its length direction.

[0042] Furthermore, when the arc-shaped punching punch 3 is in a low position, the intermediate support seat 2.7 is supported on the bottom plate 1. When the arc-shaped punching punch 3 is in a high position, the height of the intermediate support seat 2.7 is equal to or slightly lower than the height of the equal-height connecting blocks A2.3 and B2.4 on both sides, and higher than the bottom plate 1, and the product is lifted up when the arc-shaped punching punch is raised.

[0043] Furthermore, multiple groups of top equal-height connecting blocks A2.3 and multiple groups of top equal-height connecting blocks B2.4 are arranged at the same height, one end of the top equal-height connecting block A2.3 is fixed on the left steel plate support seat 2.1, and the upper end of the end surface of the other end is provided with a positioning groove A for installing the left extrusion roller 2.5, and one end of the top equal-height connecting block B2.4 is fixed on the right steel plate support seat 2.2, and the upper end of the end surface of the other end is provided with a positioning groove B for installing the right extrusion roller 2.6.

[0044] Reference Figure 2 and Figure 3 The existing power unit is used to drive the arc-shaped stamping punch 3 downward, and the arc-shaped stamping punch 3 presses down the steel plate 6, and cooperates with the left extrusion roller 2.5 and the right extrusion roller 2.6 of the lower mold 2 to bend the steel plate 6 on the lower mold 2 into an arc-shaped plate.

[0045] Furthermore, the left-side extrusion circular roller 2.5 is arranged at the same height as the top equal-height connecting block A2.3, and the left-side extrusion circular roller 2.5 is located in the positioning groove A, and can rotate relative to the top equal-height connecting block A2.3; the right-side extrusion circular roller 2.6 is arranged at the same height as the top equal-height connecting block B2.4, and the right-side extrusion circular roller 2.6 is located in the positioning groove B, and can rotate relative to the top equal-height connecting block B2.4.

[0046] Furthermore, the left extrusion circular roller 2.5 may be arranged slightly higher than the top equal-height connecting block A2.3, and the right extrusion circular roller 2.6 may be arranged slightly higher than the top equal-height connecting block B2.4.

[0047] Furthermore, the arc-shaped stamping punch 3 includes a top mounting crossbeam 3.1 connected to the power unit, a mounting plate 3.2 is provided on the lower surface of the top mounting crossbeam 3.1 along its length direction, a plurality of groups of arc-shaped convex plates 3.3 are equidistantly arranged along the length direction of the mounting plate 3.2, the bottom ends of each group of arc-shaped convex plates 3.3 are arc-shaped with the same curvature, the middle support seat 2.7 is a flat plate, and the two ends of the middle support seat 2.7 are respectively suspended and connected to the two ends of the mounting plate 3.2 by chains or soft belts, so as to lift the product when the arc-shaped stamping punch 3 is raised, and provide support for the product when the arc-shaped stamping punch 3 is pressed to the bottom.

[0048] The arc-shaped punching punch 3 adopts an arc-shaped convex plate that can be quickly disassembled and replaced, has a simple structure, and can be replaced with different sizes and specifications according to product requirements.

[0049] Furthermore, a side positioning mechanism is installed on the right steel plate support seat 2.2.

[0050] Furthermore, the side positioning mechanism includes a stop beam 4 and mutually parallel support beams A5 and B, one end of the support beam A5 and the support beam B are respectively fixed to the two ends of the right steel plate support seat 2.2, and the two ends of the stop beam 4 are respectively installed on the upper surfaces of the support beams A5 and B in an adjustable manner.

[0051] When the steel plate 6 to be processed is supported on the first supporting plane and the second supporting plane, one side edge of the steel plate 6 is abutted against one side of the joist A5 to achieve positioning of the steel plate 6.

[0052] Furthermore, both the joist A5 and the joist B are channel steels with openings facing downwards, a first long hole is opened along the length direction of the joist A5, and a second long hole is opened along the length direction of the joist B, a first bolt passes through the stop beam 4, and the first long hole connects the joist A5 with the stop beam 4; the second bolt passes through the stop beam 4, and the second long hole connects the joist B with the stop beam 4, and the position of the stop beam 4 along the length direction of the joist A5 and the joist B is adjustable.

[0053] Embodiment 3 is different from Embodiment 1 in that the left steel plate support seat 2.1 and the right steel plate support seat 2.2 are both fixedly mounted on the upper surface of the base plate 1.

[0054] Embodiment 4 is different from Embodiment 1 in that a left steel plate support seat 2.1 is adjustably mounted on the upper surface of one side of the base plate 1, and a right steel plate support seat 2.2 is adjustably mounted on the upper surface of the other side of the base plate 1, so that the distance between the left steel plate support seat 2.1 and the right steel plate support seat 2.2 can be adjusted; the left extrusion roller 2.5 and the right extrusion roller 2.6 form a pair of rollers with adjustable spacing, and the production of arc plates of different diameters can be achieved by adjusting the spacing.

[0055] The equipment for processing arc-shaped plates described in the utility model utilizes the existing power unit to drive the arc-shaped stamping punch downward, and the arc-shaped stamping punch presses the steel plate downward, and cooperates with the left extrusion roller and the right extrusion roller of the lower mold to bend the steel plate on the lower mold into an arc-shaped plate, thereby improving the forming efficiency.

[0056] In the equipment for processing arc-shaped plates of the utility model, the round rollers can rotate freely to reduce the required steel plate forming pressure.

[0057] The arc-shaped plate processing equipment of the utility model adopts an arc-shaped convex plate which can be quickly disassembled and replaced by an arc-shaped punching punch, has a simple structure, and can be replaced with different sizes and specifications according to product requirements.

[0058] The equipment for processing arc-shaped plates described in the utility model has two ends of the intermediate support seat respectively connected to the two ends of the mounting plate by chains or soft belts, and the intermediate support seat rises and falls with the arc-shaped stamping punch, lifts up the product when the arc-shaped stamping punch rises, and provides support for the product when the arc-shaped stamping punch is pressed down.

[0059] The equipment for processing arc-shaped plates described in the utility model has a left steel plate support seat adjustably installed on the upper surface position of one side of the base plate, and a right steel plate support seat adjustably installed on the upper surface position of the other side of the base plate, so that the distance between the left steel plate support seat and the right steel plate support seat can be adjusted; the left extrusion circular roller and the right extrusion circular roller form a pair of circular rollers with adjustable spacing, and the production of arc-shaped plates of different diameters can be achieved by adjusting the spacing.

[0060] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the present utility model is defined by the attached claims and their equivalents.

[0061] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A device for processing a curved plate, comprising a lower die (2) mounted on a bottom plate (1), an arc-shaped punching punch (3) being arranged above the lower die (2) and being movable up and down relative to the lower die (2), the arc-shaped punching punch (3) being pressed downward to cooperate with the lower die (2) so as to bend a steel plate (6) on the lower die (2), characterized in that: The lower mold (2) comprises a left steel plate support seat (2.1) and a right steel plate support seat (2.2) which are arranged opposite to each other, and an intermediate support seat (2.7) between the left steel plate support seat (2.1) and the right steel plate support seat (2.2); a plurality of groups of top equal-height connection blocks A (2.3) connected to the left extrusion roller (2.5) are arranged at intervals on the upper portion of the left steel plate support seat (2.1) along its length direction; a plurality of groups of top equal-height connection blocks B (2.4) connected to the right extrusion roller (2.6) are arranged at intervals on the upper portion of the right steel plate support seat (2.2) along its length direction.

2. The device for processing curved plates according to claim 1, characterized in that: The intermediate support seat (2.7) is supported on the bottom plate (1), or the intermediate support seat (2.7) is suspended below the arc-shaped stamping punch (3).

3. The device for processing curved plates according to claim 2, characterized in that: A plurality of groups of top equal-height connection blocks A (2.3) and a plurality of groups of top equal-height connection blocks B (2.4) are arranged at the same height, one end of the top equal-height connection block A (2.3) is fixed on the left steel plate support seat (2.1), and the upper end of the end surface of the other end is provided with a positioning groove A for mounting the left extrusion roller (2.5), and one end of the top equal-height connection block B (2.4) is fixed on the right steel plate support seat (2.2), and the upper end of the end surface of the other end is provided with a positioning groove B for mounting the right extrusion roller (2.6).

4. The device for processing curved plates according to claim 3, characterized in that: The left extrusion roller (2.5) is arranged at the same height as the top equal-height connection block A (2.3), and the left extrusion roller (2.5) is located in the positioning groove A and can rotate relative to the top equal-height connection block A (2.3); the right extrusion roller (2.6) is arranged at the same height as the top equal-height connection block B (2.4), and the right extrusion roller (2.6) is located in the positioning groove B and can rotate relative to the top equal-height connection block B (2.4).

5. The device for processing curved plates according to claim 4, characterized in that: The arc-shaped punching punch (3) comprises a top mounting crossbeam (3.1) connected to a power unit, a mounting plate (3.2) being arranged on the lower surface of the top mounting crossbeam (3.1) along its length direction, a plurality of groups of arc-shaped convex plates (3.3) being arranged at equal intervals along the length direction of the mounting plate (3.2), the bottom ends of each group of arc-shaped convex plates (3.3) being arc-shaped with the same curvature, the middle support seat (2.7) being a flat plate, and the two ends of the middle support seat (2.7) being respectively connected to the two ends of the mounting plate (3.2) by suspension by chains or soft belts.

6. The device for processing curved plates according to claim 5, characterized in that: A side positioning mechanism is installed on the right steel plate support seat (2.2).

7. The device for processing curved plates according to claim 6, characterized in that: The side positioning mechanism comprises a stop beam (4) and mutually parallel support beams A (5) and B, one end of each support beam A (5) and B is respectively fixed to the two ends of the right steel plate support seat (2.2), and the two ends of the stop beam (4) are respectively mounted on the upper surfaces of the support beams A (5) and B in an adjustable manner.

8. The device for processing curved plates according to claim 7, characterized in that: The joist beam A (5) and the joist beam B are both channel steels with openings facing downwards, a first long hole is opened along the length direction of the joist beam A (5), and a second long hole is opened along the length direction of the joist beam B, a first bolt passes through the stop beam (4), and the first long hole connects the joist beam A (5) with the stop beam (4); a second bolt passes through the stop beam (4), and the second long hole connects the joist beam B with the stop beam (4), and the position of the stop beam (4) along the length direction of the joist beam A (5) and the joist beam B is adjustable.

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