Mold table mechanism for plastic vacuum forming machine

Abstract

The utility model provides a mold table mechanism for a plastic vacuum forming machine, which comprises a lower mold table component, a first linkage component and a second linkage component, the lower mold table component comprises a base frame, two first driving parts, a connecting plate, a lower mold table, a first linkage component and a second linkage component, and the first linkage component and the second linkage component are used for enabling the two first driving parts to synchronously and stably drive the lower mold table to lift; the upper die table assembly comprises a mounting frame, an upper die table, two second driving pieces, two connecting pieces, a third linkage assembly and a fourth linkage assembly. The third linkage assembly and the fourth linkage assembly are used for enabling the two second driving pieces to synchronously and stably drive the upper die table to ascend and descend. The stability of the upper mold table and the lower mold table in the ascending and descending process can be effectively restrained and corrected through the first linkage assembly and the third linkage assembly, so that the overall synchronization and consistency of the lifting mechanism in the ascending and descending operation are improved, and the situation that the yield is abnormal due to mold table warping caused by mold offset when the upper mold table and the lower mold table are assembled is avoided.

Description

Technical Field

[0001] This utility model relates to the field of plastic thermoforming equipment technology, specifically to a mold table mechanism for use in a vacuum forming machine. Background Technology

[0002] A thermoforming machine, also known as a vacuum forming machine, is a machine that heats and plasticizes thermoplastic plastic rolls such as PVC, PE, PP, PET, and HIPS, and then vacuum-forms them into various shapes of high-end packaging boxes and frames. Specifically, a thermoforming machine uses the vacuum suction generated by a vacuum pump to vacuum-form softened thermoplastic plastic sheets such as PVC and PET into various shapes of vacuum covers, blister trays, and bubble wrap. Unlike injection molding and extrusion, which are single-stage processing methods, thermoforming machines do not heat and mold plastic resin or granules or continuously form the same section through a die. They also differ from machining methods using machine tools and cutters to cut off portions of plastic material to obtain the desired shape and size. Instead, they heat plastic sheets (plates) and then use molds, vacuum, or pressure to deform the sheets (plates) to achieve the required shape and size, supplemented by auxiliary processes to achieve the intended application.

[0003] Currently, most thermoforming machines on the market use various methods to lift and lower the mold table, such as single-cylinder lifting, servo motors with ball screws, hydraulic scissor lifting, or heavy-duty motors with mechanical structures. However, these methods suffer from numerous drawbacks, including high manufacturing costs, slow drive speeds, and instability in the lifting structure. Furthermore, larger thermoforming machines are prone to mold misalignment, die center of gravity shift, and excessive mold weight during mold closing, leading to inconsistent concentricity between the upper and lower molds and affecting product success rates. Therefore, existing technologies have limitations. Utility Model Content

[0004] This invention was developed to solve the above-mentioned problems, and its purpose is to provide a mold table mechanism for a vacuum forming machine.

[0005] This utility model provides a mold stage mechanism for a vacuum forming machine, including a lower mold stage assembly and an upper mold stage assembly located directly above the lower mold stage assembly. The lower mold stage assembly includes a base frame, two first driving members, a connecting plate, a lower mold stage, a first linkage assembly, and a second linkage assembly. The base frame includes a base plate and four support rods. The base plate is rectangular and mounted on the vacuum forming machine. The four support rods are located at the four corners of the base plate. The two first driving members are both mounted on the base plate and located on the axis of symmetry of the base plate, and are symmetrical about the axis of symmetry. The connecting plate is located at the output ends of the two first driving members. The lower mold stage is mounted on the connecting plate. The first and second linkage assemblies are used to synchronously and stably drive the lower mold stage to rise and fall.

[0006] The upper mold platform assembly includes a mounting frame, an upper mold platform, two second drive components, two connecting components, a third linkage assembly, and a fourth linkage assembly. The mounting frame includes a mounting plate, multiple fixing brackets, multiple connecting rods, and a top plate. The mounting plate is rectangular and is mounted on the vacuum forming machine via multiple fixing brackets. The multiple connecting rods can be slidably inserted through the mounting plate. The top plate is located on one end of the multiple connecting rods and is directly above the mounting plate. The upper mold platform is located on the other end of the multiple connecting rods and is directly below the mounting plate. The two second drive components are both mounted on the mounting plate and are located on the axis of symmetry of the mounting plate. The two second drive components are symmetrical about the axis of symmetry of the mounting plate. The output ends of the two second drive components can be slidably inserted through the mounting plate and are connected to the upper mold platform via two connecting components respectively. The third and fourth linkage assemblies are used to enable the two second drive components to synchronously and stably drive the upper mold platform to rise and fall.

[0007] The mold platform mechanism for a vacuum forming machine provided by this utility model also has the following features: the first linkage assembly includes two first drive rods, multiple first bearing seats, four first driving gears, four first guide racks, two second driving gears, a first linkage rod, and two first driven gears. The two first drive rods are rotatably mounted on the bottom wall of the lower mold platform through the first bearing seats. The two first drive rods are respectively arranged close to the two wide sides of the lower mold platform, and their arrangement direction is parallel to the transverse axis of symmetry of the lower mold platform. Each first drive rod has two ends respectively A first driving gear is provided. Each first guide rack is set on a support rod along the height direction of the support rod, and each first guide rack meshes with a first driving gear. Two second driving gears are respectively set on two first drive rods and are arranged opposite each other. A first linkage rod is rotatably set on the bottom wall of the lower mold table through a first bearing seat. The arrangement direction of the first linkage rod is parallel to the longitudinal axis of symmetry of the lower mold table. A first driven gear is provided at each end of the first linkage rod, and each first driven gear meshes with a second driving gear.

[0008] The mold table mechanism for a vacuum forming machine provided by this utility model also has the following features: the second linkage assembly includes two first fluid pipes, two second fluid pipes, a first one-way regulating valve, and a first solenoid valve. The two ends of the first fluid pipes are respectively connected to two first driving members. The two first fluid pipes are respectively arranged close to the top and bottom ends of the first driving members. The two second fluid pipes are respectively provided on the two first fluid pipes. Each second fluid pipe is provided with a first one-way regulating valve. The first solenoid valve is located between the two second fluid pipes and is connected to the two second fluid pipes. The first solenoid valve is located between the two first one-way regulating valves.

[0009] The mold platform mechanism for a vacuum forming machine provided by this utility model also has the following features: a third linkage assembly consisting of two second drive rods, multiple second bearing seats, four third drive gears, four mounting rods, a screw, four second guide racks, two fourth drive gears, a second linkage rod, and two second driven gears. The two second drive rods are rotatably mounted on the top wall of the mounting plate via the second bearing seats. The two second drive rods are respectively arranged close to the two long sides of the upper mold platform, and their arrangement direction is parallel to the longitudinal axis of symmetry of the upper mold platform. Each second drive rod has a third drive gear at both ends. The four mounting rods are all mounted on the top wall of the upper mold platform. The upper part is provided with two mounting rods arranged on the upper mold table at the four corners. The two mounting rods are connected by screws along the width direction of the upper mold table. Each mounting rod is provided with a second guide rack along its height direction. Each second guide rack meshes with a third drive gear. Two fourth drive gears are respectively provided on the two second drive rods and are arranged opposite each other. The second linkage rod is rotatably set on the top wall of the upper mold table through the second bearing seat. The arrangement direction of the second linkage rod is parallel to the transverse axis of symmetry of the upper mold table. A second driven gear is provided at each end of the second linkage rod. Each second driven gear meshes with a fourth drive gear.

[0010] Furthermore, the distance between two mounting rods arranged on the upper mold platform along its length is greater than the length of the mounting plate, and the distance between two mounting rods arranged along its width is greater than the width of the mounting plate.

[0011] Furthermore, each mounting rod has an L-shaped limiting plate at its other end, and the distance from the limiting plate to one end of the mounting rod is equal to the distance between the top plate and the upper mold table.

[0012] The mold platform mechanism for a vacuum forming machine provided by this utility model also has the following features: the fourth linkage component includes two third fluid pipes, two fourth fluid pipes, a second one-way regulating valve, and a second solenoid valve. The two ends of the third fluid pipes are respectively connected to two second driving components. The two third fluid pipes are respectively arranged close to the top and bottom ends of the second driving components. The two fourth fluid pipes are respectively provided on the two third fluid pipes. Each fourth fluid pipe is provided with a second one-way regulating valve. The second solenoid valve is located between the two fourth fluid pipes and is connected to the two fourth fluid pipes.

[0013] Functions and effects of utility models

[0014] According to the present invention, a mold platform mechanism for a vacuum forming machine can effectively constrain and correct the stability of the lower mold platform during the rising and falling process through the first linkage component, and the third linkage component can effectively constrain and correct the stability of the upper mold platform during the rising and falling process, thereby improving the overall synchronization and consistency of the mold platform mechanism during the lifting and lowering operation, and preventing abnormal yield caused by mold warping due to mold offset when the upper and lower mold platforms are closed.

[0015] Furthermore, because the two first driving components can avoid asynchrony and speed discrepancies during lifting and lowering operations through the second linkage component and the two second driving components can avoid such abnormalities through the fourth linkage component, this utility model can effectively solve the problem of inconsistent concentricity between the upper and lower molds during mold closing due to mold offset, mold center of gravity shift, and heavy mold weight, thereby affecting product yield. This results in a more stable and rapid lifting and lowering operation of the upper and lower molds with greater driving force and better synchronization. Attached Figure Description

[0016] Figure 1 This is a front view of the lower mold assembly in this utility model;

[0017] Figure 2 This is a side view of the lower mold assembly in this utility model;

[0018] Figure 3 This is a bottom view of part of the lower mold stage assembly in this utility model;

[0019] Figure 4 This is a front view of the upper mold platform assembly in this utility model;

[0020] Figure 5 This is a side view of the upper mold platform assembly in this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 10. Base frame; 11. Base plate; 12. Support rod; 20. First driving component; 30. Connecting plate; 40. Lower mold stage; 50. First linkage assembly; 51. First driving rod; 52. First bearing seat; 53. First driving gear; 54. First guide rack; 55. Second driving gear; 56. First linkage rod; 57. First driven gear; 60. Second linkage assembly; 61. First fluid pipe; 62. Second fluid pipe; 63. First one-way regulating valve; 64. First solenoid valve; 70. Safety device. Frame assembly; 71. Mounting plate; 72. Fixing bracket; 73. Connecting rod; 74. Top plate; 80. Upper mold table; 90. Second driving component; 100. Connecting component; 110. Third linkage assembly; 111. Second driving rod; 112. Second bearing seat; 113. Third drive gear; 114. Mounting rod; 115. Screw; 116. Second guide rack; 117. Fourth drive gear; 120. Limiting plate; 130. Fourth linkage assembly; 131. Third fluid pipe; 132. Fourth fluid pipe. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easy to understand, the following embodiments are described in detail with reference to the accompanying drawings.

[0024] Example

[0025] Figure 1 This is a front view of the lower mold platform assembly in this utility model. Figure 2 This is a side view of the lower mold plate assembly in this utility model. Figure 3 This is a bottom view of part of the lower mold stage assembly in this utility model. Figure 4 This is a front view of the upper mold platform assembly in this utility model. Figure 5 This is a side view of the upper mold platform assembly in this utility model.

[0026] like Figures 1 to 5 As shown, this embodiment provides a mold platform mechanism for a vacuum forming machine, including a lower mold platform assembly disposed on the vacuum forming machine and an upper mold platform assembly disposed on the vacuum forming machine and located directly above the lower mold platform assembly.

[0027] like Figures 1 to 3 As shown, the lower mold stage assembly includes a base frame 10, two first drive components 20, a connecting plate 30, a lower mold stage 40, a first linkage assembly 50, and a second linkage assembly 60. The first drive component 20 is preferably a cylinder.

[0028] In this embodiment, the base frame 10 includes a base plate 11 and four support rods 12. The base plate 11 is rectangular and is mounted on a vacuum forming machine. The four support rods 12 are respectively located at the four corners of the base plate 11.

[0029] In this embodiment, both first driving members 20 are disposed on the substrate 11 and located on the axis of symmetry of the substrate 11. The two first driving members 20 are symmetrical about the axis of symmetry of the substrate 11. Specifically, if the two first driving members 20 are located on the longitudinal axis of symmetry of the substrate 11, then the two first driving members 20 are symmetrical about the transverse axis of symmetry of the substrate 11; if the two first driving members 20 are located on the transverse axis of symmetry of the substrate 11, then the two first driving members 20 are symmetrical about the longitudinal axis of symmetry of the substrate 11.

[0030] In this embodiment, the connecting plate 30 is disposed on the output end of the two first driving members 20.

[0031] In this embodiment, the lower mold platform 40 is disposed on the connecting plate 30.

[0032] In this embodiment, the first linkage assembly 50 includes two first drive rods 51, multiple first bearing seats 52, four first drive gears 53, four first guide racks 54, two second drive gears 55, a first linkage rod 56, and two first driven gears 57.

[0033] Two first drive rods 51 are rotatably mounted on the bottom wall of the lower mold platform 40 via first bearing seats 52. The two first drive rods 51 are arranged near the wide sides of the lower mold platform 40, and their arrangement direction is parallel to the transverse axis of symmetry of the lower mold platform 40. Each first drive rod 51 has a first driving gear 53 at both ends. Each first guide rack 54 is mounted on a support rod 12 along its height direction, and each first guide rack 54 meshes with a first driving gear 53. Two second driving gears 55 are respectively mounted on the two first drive rods 51, and the two second driving gears 55 are arranged opposite each other. A first linkage rod 56 is rotatably mounted on the bottom wall of the lower mold platform 40 via first bearing seats 52. The arrangement direction of the first linkage rod 56 is parallel to the longitudinal axis of symmetry of the lower mold platform 40. Each first driven gear 57 has a first driven gear 57 at both ends, and each first driven gear 57 meshes with a second driving gear 55.

[0034] In this embodiment, the second linkage component 60 includes two first fluid pipes 61, two second fluid pipes 62, a first one-way regulating valve 63, and a first solenoid valve 64. The first solenoid valve 64 is preferably a two-way solenoid valve.

[0035] The first fluid pipe 61 has two ends connected to two first driving members 20, and the two first fluid pipes 61 are arranged close to the top and bottom ends of the first driving members 20, respectively. Two second fluid pipes 62 are respectively disposed on the two first fluid pipes 61, and each second fluid pipe 62 is equipped with a first one-way regulating valve 63. Specifically, both ends of the second fluid pipe 62 are connected to the corresponding first fluid pipe 61. A first solenoid valve 64 is disposed between the two second fluid pipes 62 and is connected to both second fluid pipes 62; the first solenoid valve 64 is located between the two first one-way regulating valves.

[0036] like Figure 4 and Figure 5 As shown, the upper mold platform assembly includes a mounting frame 70, an upper mold platform 80, two second drive components 90, two connectors 100, a third linkage assembly 110, and a fourth linkage assembly 130. The connectors 100 are preferably connecting flanges, and the second drive components 90 are preferably cylinders.

[0037] In this embodiment, the mounting frame 70 includes a mounting plate 71, multiple fixing brackets 72, multiple connecting rods 73, and a top plate 74. The mounting plate 71 is rectangular and is mounted on the vacuum forming machine through multiple fixing brackets 72. The multiple connecting rods 73 can be slidably mounted on the mounting plate 71. The top plate 74 is located on one end of the multiple connecting rods 73 and is directly above the mounting plate 71.

[0038] In this embodiment, the upper mold platform 80 is located on the other end of the multiple connecting rods 73 and is located directly below the mounting plate 71.

[0039] In this embodiment, the third linkage assembly 110 includes two second drive rods 111, multiple second bearing seats 112, four third drive gears 113, four mounting rods 114, a screw 115, four second guide racks 116, two fourth drive gears 117, a second linkage rod (not shown in the figure), and two second driven gears (not shown in the figure).

[0040] Two second drive rods 111 are rotatably mounted on the top wall of the mounting plate 71 via second bearing seats 112. The two second drive rods 111 are arranged near the long sides of the upper mold platform 80, and their arrangement direction is parallel to the longitudinal axis of symmetry of the upper mold platform 80. Each second drive rod 111 has a third drive gear 113 at both ends. Four mounting rods 114 are all mounted on the top wall of the upper mold platform 80, and are respectively located near the four corners of the upper mold platform 80. Specifically, one end of each mounting rod 114 is connected to the top wall of the upper mold platform 80. Two mounting rods 114 arranged on the upper mold platform 80 along its width direction are connected by screws 115. Each mounting rod 114 has a second guide rack 116 along its height direction, and each second guide rack 116 meshes with a third drive gear 113. Two fourth driving gears 117 are respectively mounted on two second driving rods 111, and the two fourth driving gears 117 are arranged opposite to each other. The second linkage rod is rotatably mounted on the top wall of the upper mold table 80 through the second bearing seat 112. The arrangement direction of the second linkage rod is parallel to the transverse axis of symmetry of the upper mold table 80. A second driven gear is provided at each end of the second linkage rod, and each second driven gear meshes with a fourth driving gear 117.

[0041] In this embodiment, the distance between the two mounting rods 114 arranged on the upper mold table 80 along its length direction is greater than the length of the mounting plate 71, and the distance between the two mounting rods 114 arranged along its width direction is greater than the width of the mounting plate 71.

[0042] In this embodiment, each mounting rod 114 has an L-shaped limiting plate 120 at the other end, and the distance from the limiting plate 120 to one end of the mounting rod 114 is equal to the distance between the top plate 74 and the upper mold table 80.

[0043] In this embodiment, the fourth linkage component 130 includes two third fluid pipes 131, two fourth fluid pipes 132, a second one-way regulating valve (not shown in the figure), and a second solenoid valve (not shown in the figure). The second solenoid valve is preferably a two-way solenoid valve.

[0044] The third fluid pipe 131 has two ends connected to two second driving components 90, and the two third fluid pipes 131 are arranged near the top and bottom ends of the second driving components 90, respectively. Two fourth fluid pipes 132 are respectively disposed on the two third fluid pipes 131, and each fourth fluid pipe 132 is equipped with a second one-way regulating valve. Specifically, both ends of the fourth fluid pipe 132 are connected to the corresponding third fluid pipe 131. A second solenoid valve is disposed between the two fourth fluid pipes 132 and is connected to both fourth fluid pipes 132.

[0045] The role and effect of the embodiments

[0046] According to the present invention, a mold platform mechanism for a vacuum forming machine can effectively constrain and correct the stability of the lower mold platform during the rising and falling process through the first linkage component, and the third linkage component can effectively constrain and correct the stability of the upper mold platform during the rising and falling process, thereby improving the overall synchronization and consistency of the mold platform mechanism during the lifting and lowering operation, and preventing abnormal yield caused by mold warping due to mold offset when the upper and lower mold platforms are closed.

[0047] Furthermore, because the two first driving components can avoid asynchrony and speed discrepancies during lifting and lowering operations through the second linkage component and the two second driving components can avoid such abnormalities through the fourth linkage component, this utility model can effectively solve the problem of inconsistent concentricity between the upper and lower molds during mold closing due to mold offset, mold center of gravity shift, and heavy mold weight, thereby affecting product yield. This results in a more stable and rapid lifting and lowering operation of the upper and lower molds with greater driving force and better synchronization.

[0048] The above embodiments are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model.

Claims

1. A mold table mechanism for a vacuum forming machine, comprising a lower mold table assembly arranged on the vacuum forming machine and an upper mold table assembly arranged on the vacuum forming machine and located directly above the lower mold table assembly, characterized in that: the lower mold table assembly comprises a base frame, two first driving members, a connecting plate, a lower mold table, a first linkage joint and a second linkage joint, the base frame comprises a base plate and four support rods, the base plate is rectangular, arranged on the vacuum forming machine, and the four support rods are arranged at the four corners of the base plate, the two first driving members are arranged on the base plate and located on the symmetry axis of the base plate, and the two first driving members are symmetrical about the symmetry axis of the base plate, the connecting plate is arranged on the output end of the two first driving members, the lower mold table is arranged on the connecting plate, the first linkage joint and the second linkage joint are used to synchronously and stably drive the lower mold table to rise and fall, the upper mold table assembly comprises a mounting frame, an upper mold table, two second driving members, two connecting members, a third linkage joint and a fourth linkage joint, the mounting frame comprises a mounting plate, a plurality of fixing frames, a plurality of connecting rods and a top plate, the mounting plate is rectangular, arranged on the vacuum forming machine through the plurality of fixing frames, the plurality of connecting rods are slidably arranged on the mounting plate, and the top plate is arranged on one end of the plurality of connecting rods and located directly above the mounting plate, the upper mold table is arranged on the other end of the plurality of connecting rods and located directly below the mounting plate, the two second driving members are arranged on the mounting plate and located on the symmetry axis of the mounting plate, and the two second driving members are symmetrical about the symmetry axis of the mounting plate, the output ends of the two second driving members are slidably penetrated through the mounting plate and connected with the upper mold table through the two connecting members respectively, the third linkage joint and the fourth linkage joint are used to synchronously and stably drive the upper mold table to rise and fall. 2.The mold table mechanism for the vacuum forming machine according to claim 1, characterized in that: wherein the first linkage joint comprises two first driving rods, a plurality of first bearing seats, four first driving gears, four first guide racks, two second driving gears, a first linkage rod and two first driven gears, the two first driving rods are rotatably arranged on the bottom wall of the lower mold table through the first bearing seats, and the two first driving rods are arranged close to the two wide sides of the lower mold table and parallel to the transverse symmetry axis of the lower mold table, one first driving gear is arranged at each end of each first driving rod, each first guide rack is arranged on one support rod along the height direction of the support rod, and each first guide rack is meshed with one first driving gear, the two second driving gears are arranged on the two first driving rods respectively and oppositely, The first linkage rod is rotatably arranged on the bottom wall of the lower die table through the first bearing seat, the arrangement direction of the first linkage rod is parallel to the longitudinal symmetry axis of the lower die table, and two ends of the first linkage rod are respectively provided with a first driven gear.

3. The die table mechanism for a blister machine according to claim 1, wherein: wherein The second linkage assembly comprises two first fluid pipes, two second fluid pipes, a first one-way regulating valve and a first electromagnetic valve, two ends of the first fluid pipes are respectively communicated with the two first driving members, and the two first fluid pipes are arranged close to the top end and the bottom end of the first driving member respectively, the two second fluid pipes are arranged on the two first fluid pipes respectively, each of the second fluid pipes is provided with a first one-way regulating valve, the first electromagnetic valve is arranged between the two second fluid pipes and communicated with the two second fluid pipes, and the first electromagnetic valve is located between the two first one-way regulating valves.

4. The die table mechanism for a blister machine according to claim 1, wherein: wherein The third linkage assembly comprises two second driving rods, a plurality of second bearing seats, four third driving gears, four mounting rods, a screw rod, four second guide racks, two fourth driving gears, a second linkage rod and two second driven gears, The two second driving rods are rotatably arranged on the top wall of the mounting plate through the second bearing seats, the two second driving rods are arranged close to the two long sides of the upper die table respectively, and the arrangement direction is parallel to the longitudinal symmetry axis of the upper die table, Two ends of each of the second driving rods are respectively provided with a third driving gear, The four mounting rods are arranged on the top wall of the upper die table and arranged close to the four corners of the upper die table respectively, the two mounting rods arranged on the upper die table and along the width direction thereof are connected through the screw rod, each of the mounting rods is provided with a second guide rack along the height direction thereof, Each of the second guide racks is engaged with a third driving gear, The two fourth driving gears are arranged on the two second driving rods respectively, and the two fourth driving gears are arranged oppositely, The second linkage rod is rotatably arranged on the top wall of the upper die table through the second bearing seat, the arrangement direction of the second linkage rod is parallel to the transverse symmetry axis of the upper die table, two ends of the second linkage rod are respectively provided with a second driven gear, and each of the second driven gears is engaged with a fourth driving gear.

5. The die table mechanism for a blister machine according to claim 1, wherein: wherein, The fourth linkage assembly comprises two third fluid pipes, two fourth fluid pipes, a second one-way regulating valve and a second electromagnetic valve, two ends of the third fluid pipes are communicated with the two second driving members respectively, the two third fluid pipes are arranged near the top end and the bottom end of the second driving member respectively, the two fourth fluid pipes are arranged on the two third fluid pipes respectively, the second one-way regulating valve is arranged on each fourth fluid pipe, and the second electromagnetic valve is arranged between the two fourth fluid pipes and communicated with the two fourth fluid pipes.

6. The mold table mechanism for a plastic blowing machine according to claim 4, wherein: wherein, The distance between the two mounting rods arranged on the upper mold table and along the length direction thereof is greater than the length of the mounting plate, and the distance between the two mounting rods arranged along the width direction thereof is greater than the width of the mounting plate.

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