A movable double-folding workbench mounted on the top of the cab

Abstract

The present invention relates to a movable double-folding workbench installed on the top of a cab, and the workbench can be divided into a supporting part, a display installation and reinforcement part, and a keyboard installation and reinforcement part, and the supporting part and the keyboard installation and reinforcement part are connected to the display installation and reinforcement part through a rotating shaft respectively. The workbench is installed on the top of the cab. In the transport state, the workbench is completely folded and located in a suitable position that does not affect the driver's driving and the co-pilot's riding. In the working state, the workbench is first moved to a position convenient for the staff to operate by using a guide rail, and then the workbench is fully unfolded for the staff to use. The workbench has a corresponding locking mechanism in the transport state or the working state to ensure that its posture and position are relatively fixed, and a corresponding positioner is provided to accurately position its flipping when each level is unfolded and folded.

Description

Technical Field

[0001] The invention relates to a workbench, in particular to a workbench which is installed on the top of a cab and has a main body which can move on a guide bearing and can be double-folded. Background Art

[0002] Display and keyboard are indispensable in radar system, so a certain space should be reserved for their installation in the initial design stage. The traditional method is to fix the display and keyboard on a workbench connected to the ground or side wall, or to install the display and keyboard on the control console of the control cabin, or to modify the center console of the cab to install the display and keyboard.

[0003] At present, the installation of the display and keyboard in the radar system in the patents disclosed for inventions is still at the above stage, which to a certain extent creates certain difficulties for the spatial arrangement of the control cabin and the modification of the vehicle. Therefore, there is an urgent need for a workbench that occupies a small space and is convenient and quick to implement to install the display and keyboard, so as to improve space utilization and reduce costs. Summary of the invention

[0004] Technical issues to be solved

[0005] In order to avoid the deficiencies of the prior art, the present invention provides a movable double-folding workbench installed on the top of a cab.

[0006] Technical Solution

[0007] A movable double-folding workbench installed on the top of a cab, characterized by comprising a support portion, a mounting and reinforcement display portion, and a mounting and reinforcement keyboard portion;

[0008] The support part includes four mounting angle pieces, two guide bearings and a support frame, wherein a workbench positioner is installed on each of the two mounting angle pieces, the guide bearings are connected to the mounting angle pieces, the workbench positioning bracket is welded to the support frame, the pin shaft on the workbench positioner is inserted into the hole of the workbench positioning bracket to limit the movement of the workbench along the bearing, the support frame is connected to the guide bearing, two first-level deployment positioning blocks are welded to the support frame, the first-level deployment positioning blocks are used to determine the rotation angle of the workbench when the first-level deployment is carried out, when the workbench is deployed in the first level, when the display frame contacts the surface of the first-level deployment positioning block, it is deployed in place, the locking mechanism is installed on the support frame, and the locking bracket confirms that the workbench does not automatically deploy when it is in a fully folded state by limiting the movement of the locking mechanism;

[0009] The mounting and reinforcement display part comprises a display frame and a display back cover, the display frame is connected to the support frame through a rotating shaft, the reinforcement display is mounted on the display frame, and the display back cover and the display frame are connected through screws; the secondary folding positioning bracket and the secondary unfolding limit block are respectively connected to the display frame through welding, the secondary folding positioning bracket is used to determine the closing angle of the workbench during the secondary folding, and when the secondary folding positioning bracket contacts the support frame during the secondary folding, it indicates that the folding is in place; the secondary unfolding limit block is used to determine the rotation angle of the workbench during the secondary unfolding, and when the keyboard frame contacts the secondary unfolding limit block during the secondary unfolding, it indicates that the unfolding is in place; the primary folding positioner is mounted on the display frame through screws, and the primary folding positioner is used to determine the closing angle of the workbench during the primary folding;

[0010] The installed reinforced keyboard part includes a keyboard frame and a reinforced keyboard. The keyboard frame is connected to the display frame through a rotating shaft, the reinforced keyboard is connected to the table top through screws, the table top is connected to the keyboard frame through screws, and the first-level folding positioning block is welded to the keyboard frame. When the first-level folding positioning block contacts the first-level folding positioner during the first-level folding, it indicates that the folding is in place.

[0011] A further technical solution of the present invention is as follows: the guide bearing is connected to the mounting angle piece through a bearing sleeve and a clamp; one end of the bearing sleeve is welded to the mounting angle piece, and the other end is sleeved on the guide bearing; a bearing slot is provided on one end of the guide bearing and is fixed by a clamp.

[0012] A further technical solution of the present invention is as follows: the support frame is connected to the guide bearing through a bearing assembly, a circular hole for installing the guide bearing is provided in the middle of the bearing assembly, and a screw hole for fixing the support frame is provided on one side.

[0013] Further technical solution of the present invention: the locking mechanism includes a rotating shaft, a bracket, an adjusting screw, and a locking nut, wherein the bracket is provided with two threaded holes with vertical axes connected to the supporting frame, and the lower end is provided with two holes with horizontal axes for fixing the adjusting screw, one end of the adjusting screw is provided with a hole, and the other end can be installed with a locking nut, and the rotating shaft passes through the hole at the lower end of the bracket and the hole of the adjusting screw to connect the bracket and the adjusting screw together.

[0014] A further technical solution of the present invention: the first-level folding positioning includes an auxiliary gasket, a neodymium magnet, a shell, and a cover. The shell and the cover are each provided with a semi-cylindrical groove. The neodymium magnet and the auxiliary gasket are respectively placed in the semi-cylindrical grooves of the shell and the cover, and then the shell and the cover are connected together with screws.

[0015] A further technical solution of the present invention is as follows: the locking bracket is installed on the keyboard frame and is provided with a U-shaped hole for fixing the locking mechanism.

[0016] A further technical solution of the present invention is as follows: the rotating shaft comprises a shaft, a washer and a bushing, and the washer and the bushing are sequentially inserted into the shaft and connected together.

[0017] Beneficial Effects

[0018] The present invention proposes a movable double-folding workbench installed on the top of the cab. The workbench is installed on the top of the cab and is in a completely folded state in the transport state. The workbench is located at a suitable position on the top of the cab that does not affect the driver's field of vision and the co-driver's seat. In the working state, the workbench can be moved to a position convenient for the staff to operate by using a guide bearing, and the workbench can be fully unfolded for the staff to operate. The workbench is easy to operate when folding, unfolding and moving, and is safe and reliable.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The installation angle of the workbench is connected to the top of the cab by screws, which rationally plans the limited space of the cab and improves space utilization;

[0021] (2) The workbench is in different states and positions during operation and transportation, which neither affects the driver's field of vision nor the co-pilot's riding in the transportation state, nor is it difficult for personnel to operate in the working state;

[0022] (3) The workbench is easy to operate when unfolding and folding, and there are corresponding positioners at each level to position its flipping when unfolding and folding. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0024] Figure 1 This is a front view of the workbench in transport status;

[0025] Figure 2 This is a schematic diagram of the back of the workbench in the transport state;

[0026] Figure 3 A schematic diagram of a workbench in a state to be unfolded;

[0027] Figure 4 It is a schematic diagram of a workbench in a first-level unfolded / folded state;

[0028] Figure 5 is a schematic diagram of a workbench in a fully unfolded state;

[0029] Figure 6 This is a schematic diagram for installing corner fittings;

[0030] Figure 7 This is a schematic diagram of a guide bearing;

[0031] Figure 8 It is a schematic diagram of the support frame;

[0032] Fig. 9 This is a schematic diagram of the workbench locator;

[0033] Fig.10 is a schematic diagram of a bearing bushing;

[0034] Fig.11 is a schematic diagram of a clamp;

[0035] Fig.12 A schematic diagram of the workbench positioning bracket;

[0036] Fig.13 is a schematic diagram of a bearing assembly;

[0037] Fig.14 It is a schematic diagram of the first-level expansion positioning block;

[0038] Fig.15 is a schematic diagram of a display frame;

[0039] Fig.16 is a schematic diagram of the locking mechanism;

[0040] Fig.17 This is a schematic diagram of the wiring bracket;

[0041] Fig.18 is a schematic diagram of a locking bracket;

[0042] Fig.19 This is a schematic diagram of the back cover of the display;

[0043] Fig. 20 is a schematic diagram of the rotating shaft;

[0044] Fig.21 The intention of the secondary folding positioning bracket;

[0045] Fig. 22 It is a schematic diagram of the secondary expansion limit block;

[0046] Fig.23 This is a schematic diagram of the keyboard frame;

[0047] Fig.24 It is a schematic diagram of a first-level folding locator;

[0048] Fig.25 This is a schematic diagram of the table;

[0049] Fig.26 This is a schematic diagram of the first-level folding positioning block;

[0050] Fig. 27This is a schematic diagram of the keyboard back cover.

[0051] In the figure: 1-installation angle piece; 2-guide bearing; 3-support frame; 4-workbench positioner; 5-bearing bushing; 6-clamp; 7-workbench positioning bracket; 8-bearing assembly; 9-first-stage unfolding positioning block; 10-display frame; 11-locking mechanism; 12-wiring bracket; 13-locking bracket; 14-display back cover; 15-rotating shaft; 16-reinforced display; 17-secondary folding positioning bracket; 18-secondary unfolding limit block; 19-keyboard frame; 20-first-stage folding positioner; 21-reinforced keyboard; 22-table top; 23-first-stage folding positioning block; 24-keyboard back cover; 25-rotating shaft; 26-adjusting screw; 27-locking nut; 28-bracket; 29-auxiliary washer; 30-neodymium magnet; 31-shell; 32-cover; 33-shaft; 34-washer; 35-bushing; 36-locating pin. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] The present invention provides a movable double-folding workbench installed on the top of a cab, which mainly comprises a supporting part, a display installation and reinforcement part and a keyboard installation and reinforcement part.

[0054] The supporting part mainly includes four mounting angle pieces 1, two guide bearings 2 and a supporting frame 3, wherein a workbench locator 4 is installed on each of the two mounting angle pieces 1 by welding, the guide bearing 2 is connected to the mounting angle piece 1 by a bearing bushing 5 and a clamp 6, the workbench positioning bracket 7 is welded to the supporting frame 3, the pin shaft 36 on the workbench locator 4 is inserted into the hole of the workbench positioning bracket 7 to limit the movement of the workbench along the bearing, the supporting frame 3 is connected to the guide bearing 2 by a bearing assembly 8, two first-level deployment positioning blocks 9 are installed on the supporting frame 3 by welding, the first-level deployment positioning block 9 is used to determine the rotation angle of the workbench when the first level is deployed, when the workbench is deployed at the first level, when the display frame 10 contacts the surface of the first-level deployment positioning block 9, it is deployed into place, the locking mechanism 11 and the wiring bracket 12 are respectively connected to the supporting frame 3 by screws, and the locking bracket 13 confirms that the workbench does not automatically deploy when it is in a fully folded state by limiting the movement of the locking mechanism 11.

[0055] The installation and reinforcement display part mainly includes a display frame 10 and a display back cover 14. The display frame 10 is connected to the support frame 3 through a rotating shaft 15. The reinforced display 16 is installed on the display frame 10 by screws. The display back cover 14 and the display frame 10 are connected by screws. The secondary folding positioning bracket 17 and the secondary expansion limit block 18 are respectively connected to the display frame 10 by welding. The secondary folding positioning bracket 17 is used to determine the closing angle of the workbench during the secondary folding. When the secondary folding positioning bracket 17 contacts the support frame 3 during the secondary folding, it indicates that the folding is in place. The secondary expansion limit block 18 is used to determine the rotation angle of the workbench during the secondary expansion. When the keyboard frame 19 contacts the secondary expansion limit block 18 during the secondary expansion, it indicates that the expansion is in place. Two primary folding positioners 20 equipped with neodymium magnets are installed on the display frame 10 by screws. The primary folding positioner 20 is used to determine the closing angle of the workbench during the primary folding.

[0056] The installed reinforced keyboard part includes a keyboard frame 19 and a reinforced keyboard 21. The keyboard frame 19 is connected to the display frame 10 through the rotating shaft 15. The reinforced keyboard 21 is connected to the table top 22 through screws. The table top 22 is connected to the keyboard frame 19 through screws. The first-level folding positioning block 23 is welded on the keyboard frame 19. When the first-level folding positioning block 23 contacts the first-level folding positioner 20 during the first-level folding, it indicates that the folding is in place. The keyboard back cover 24 is installed on the keyboard frame 19 through screws.

[0057] In order to enable those skilled in the art to better understand the present invention, the present invention is described in detail below in conjunction with specific embodiments.

[0058] This example is a movable double-folding workbench installed on the top of the cab, which mainly includes an installation angle piece 1, a guide bearing 2, a support frame 3, a workbench positioner 4, a bearing bushing 5, a clamp 6, a workbench positioning bracket 7, a bearing assembly 8, a primary unfolding positioning block 9, a display frame 10, a locking mechanism 11, a wiring bracket 12, a locking bracket 13, a display back cover 14, a rotating shaft 15, a reinforced display 16, a secondary folding positioning bracket 17, a secondary unfolding limit block 18, a keyboard frame 19, a primary folding positioner 20, a reinforced keyboard 21, a table top 22, a primary folding positioning block 23, and a keyboard back cover 24. This example has four main states during use: fully folded state, to-be-unfolded state, primary folded / unfolded state, and fully unfolded state. These four states are introduced below.

[0059] Fully folded state: Figure 1 and Figure 2As shown, the workbench is in a fully folded state, and the mounting angle piece 1 is connected to the top of the cab by screws. When the first-level folding state is changed to the second-level folding state, when the second-level folding positioning bracket 17 contacts the supporting frame 3, it indicates that the folding is in place. The locking nut 27 of the locking mechanism 11 limits the movement of the locking bracket 13 to achieve the locking purpose. The positioning pin 36 of the workbench positioner 4 is inserted into the elliptical hole of the workbench positioning bracket 7 so that the workbench will not move along the guide bearing.

[0060] To be expanded: Figure 3 As shown, the workbench is in a state to be unfolded. To change from the fully folded state to the state to be unfolded, it is necessary to first pull out the locating pin 36 of the left workbench locator 4 from the workbench locating bracket 7, then push the main body of the workbench to the right side of the guide bearing 2, and insert the locating pin 36 of the right workbench locator 4 into the elliptical hole in the right workbench locating bracket 7.

[0061] First level expansion / collapse state: Figure 4 As shown, the workbench is in a first-level unfolding / folding state. When the workbench is changed from a to-be-unfolded state to a first-level unfolding state, the locking mechanism 11 needs to be lifted upward and separated from the locking bracket 13, and then the main body of the workbench needs to be flipped downward around the rotating shaft 15 until the display frame 10 contacts the first-level unfolding positioning block 9; when the workbench is changed from a fully unfolded state to a first-level folding state, the keyboard installation reinforcement part needs to be flipped upward around the rotating shaft 15 until the first-level folding positioning block 23 contacts the first-level folding positioner 20.

[0062] Fully expanded state: Figure 5 As shown, the workbench is in a fully expanded state. To move the workbench from the primary expanded state to the fully expanded state, the keyboard installation reinforcement part needs to be flipped downward around the rotation axis 15 until the keyboard frame 19 contacts the secondary expanded limit block 18 .

[0063] like Figure 6 As shown, it is a schematic diagram of installing the angle piece 1, the upper end face of which is provided with three screw holes connected to the top of the cab, and the lower end is two orthogonal planes, each of which is provided with a through hole, one through hole is used to install the guide bearing 2, and the other through hole is used to install the workbench positioner 4.

[0064] like Figure 7 The figure shows a schematic diagram of a guide bearing 2, both ends of which are mounted on the mounting angle piece 1 through bearing bushings 5 ​​and clamps 6.

[0065] like Figure 8 As shown, it is a schematic diagram of the support frame 3, the middle of the top is a square groove, and two corners of one side are provided with holes for installing the rotating shaft 15.

[0066] like Fig. 9 As shown, it is a schematic diagram of the workbench positioner 4, and the end is a positioning pin 36.

[0067] like Fig.10 As shown, it is a schematic diagram of a bearing bushing 5, one end of which is welded to the mounting angle piece 1, and the other end is sleeved on the guide bearing 2, and the end is provided with a slot for telescopic use.

[0068] like Fig.11 , which is a schematic diagram of a clamp 6, which is installed on the bearing bushing 5 to fix the guide bearing 2.

[0069] like Fig.12 , which is a schematic diagram of a workbench positioning bracket 7 , the workbench positioning bracket 7 is welded to the supporting frame 3 , and is provided with an elliptical hole for fixing the pin shaft 36 .

[0070] like Fig.13 As shown, it is a schematic diagram of the bearing assembly 8, in which a circular hole for installing the guide bearing 2 is provided in the middle, and four screw holes for fixing with the support frame 3 are provided on one side.

[0071] like Fig.14 , which is a schematic diagram of a primary deployment positioning block 9 , wherein the primary deployment positioning block 9 is mounted on the support frame 3 by welding.

[0072] like Fig.15 , which is a schematic diagram of a display frame 10 , wherein the display frame 10 is connected to the support frame 3 via a rotating shaft 15 , and a reinforcement display 16 is mounted on the display frame 10 via screws.

[0073] Fig.16 Schematic diagram of the locking mechanism 15, the locking mechanism 15 includes a rotating shaft 25, a bracket 28, an adjusting screw 26, and a locking nut 25, wherein the bracket 28 is provided with two threaded holes with vertical axes connected to the support frame 3, and the lower end is provided with two holes with horizontal axes for fixing the adjusting screw 26, one end of the adjusting screw 26 is provided with a hole, and the other end can be installed with a locking nut 27, the rotating shaft 25 passes through the hole at the lower end of the bracket 28 and the hole of the adjusting screw 26, and connects the bracket 28 and the adjusting screw 26 together.

[0074] Fig.17 Schematic diagram of the wiring bracket 12, which is provided with a plurality of elliptical holes for wiring.

[0075] Fig.18 Schematic diagram of the locking bracket 13 , which is mounted on the keyboard frame 19 and has a U-shaped hole thereon for fixing the locking mechanism 15 .

[0076] Fig.19 It is a schematic diagram of the display back cover 14 , which is mounted on the display frame 10 by screws, and the reinforced display 16 is mounted on the display back cover 14 .

[0077] Fig. 20 Schematic diagram of the rotating shaft 15, the rotating shaft 15 comprises a shaft 33, a washer 34, and a bushing 35, and the washer 34 and the bushing 35 are sequentially inserted into the shaft 33 and connected together.

[0078] Fig.21 The secondary folding positioning bracket 17 is connected to the display frame 10 by welding.

[0079] Fig. 22 Schematic diagram of the secondary expansion limit block 18, which is connected to the display frame 10 by welding.

[0080] Fig.23 Schematic diagram of a keyboard frame 19 , which is connected to the display frame 10 via a rotating shaft 15 .

[0081] Fig.24 This is a schematic diagram of a primary folding positioner 20, which includes an auxiliary gasket 29, a neodymium magnet 30, a shell 31, and a cover 32. The shell 31 and the cover 32 are each provided with a semi-cylindrical groove, and the neodymium magnet 30 and the auxiliary gasket 29 are respectively placed in the semi-cylindrical grooves of the shell 31 and the cover 32, and then the shell 31 and the cover 32 are connected together with screws.

[0082] Fig.25 Schematic diagram of a table top 22 , which is mounted on the keyboard frame 19 , and a reinforced keyboard 21 is fixed on the table top 22 .

[0083] Fig.26 This is a schematic diagram of a primary folding positioning block 23 , which is welded to the keyboard frame 19 .

[0084] Fig. 27 Schematic diagram of the keyboard back cover 24 , which is installed on the keyboard frame 19 .

[0085] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. A movable double-folding workbench installed on the top of the cab, characterized in that It includes a supporting part, a display installation and reinforcement part, and a keyboard installation and reinforcement part; The support part comprises four mounting angle pieces (1), two guide bearings (2) and a support frame (3), wherein a workbench positioner (4) is respectively mounted on the two mounting angle pieces (1), the guide bearings (2) are connected to the mounting angle pieces (1), a workbench positioning bracket (7) is welded to the support frame (3), a pin shaft (36) on the workbench positioner (4) is inserted into a hole of the workbench positioning bracket (7) to limit the movement of the workbench along the bearing, the support frame (3) is connected to the guide bearing (2), two first-stage unfolding positioning blocks (9) are welded to the support frame (3), the first-stage unfolding positioning blocks (9) are used to determine the rotation angle of the workbench when the first stage is unfolded, when the display frame (10) contacts the surface of the first-stage unfolding positioning blocks (9) when the workbench is unfolded in the first stage, the workbench is unfolded into place, a locking mechanism (11) is mounted on the support frame (3), and the locking bracket (13) confirms that the workbench does not automatically unfold when it is in a fully folded state by limiting the movement of the locking mechanism (11); The mounting and reinforcement display part comprises a display frame (10) and a display back cover (14), wherein the display frame (10) is connected to the support frame (3) via a rotating shaft, the reinforcement display (16) is mounted on the display frame (10), and the display back cover (14) and the display frame (10) are connected via screws; the secondary folding positioning bracket (17) and the secondary unfolding limit block (18) are respectively connected to the display frame (10) via welding, the secondary folding positioning bracket (17) is used to determine the closing angle of the workbench during the secondary folding, and when the secondary folding positioning bracket (17) contacts the support frame (3) during the secondary folding, it indicates that the folding is in place; the secondary unfolding limit block (18) is used to determine the rotation angle of the workbench during the secondary unfolding, and when the keyboard frame (19) contacts the secondary unfolding limit block (18) during the secondary unfolding, it indicates that the unfolding is in place; the primary folding positioner (20) is mounted on the display frame (10) via screws, and the primary folding positioner (20) is used to determine the closing angle of the workbench during the primary folding; The installation and reinforcement keyboard part comprises a keyboard frame (19) and a reinforcement keyboard (21); the keyboard frame (19) is connected to the display frame (10) via a rotating shaft; the reinforcement keyboard (21) is connected to the table top (22) via screws; the table top (22) is connected to the keyboard frame (19) via screws; a primary folding positioning block (23) is welded to the keyboard frame (19); when the primary folding positioning block (23) contacts the primary folding positioner (20) during primary folding, it indicates that the folding is in place.

2. A movable double-folding workbench installed on the top of the cab according to claim 1, characterized in that: The guide bearing (2) is connected to the mounting angle piece (1) via a bearing bushing (5) and a clamp (6); one end of the bearing bushing (5) is welded to the mounting angle piece (1), and the other end is sleeved on the guide bearing (2); a bearing slot is provided on one end sleeved on the guide bearing (2) and fixed by the clamp (6).

3. A movable double-folding workbench installed on the top of the cab according to claim 1, characterized in that: The support frame (3) is connected to the guide bearing (2) via a bearing assembly (8); a circular hole for installing the guide bearing (2) is provided in the middle of the bearing assembly (8), and a screw hole for fixing the support frame (3) is provided on one side.

4. A movable double-folding workbench installed on the top of the cab according to claim 1, characterized in that: The locking mechanism (15) comprises a rotating shaft (25), a bracket (28), an adjusting screw (26), and a locking nut (25), wherein the bracket (28) is provided with two threaded holes with axes in a vertical direction connected to the support frame (3), and the lower end is provided with two holes with axes in a horizontal direction for fixing the adjusting screw (26), one end of the adjusting screw (26) is provided with a hole, and the other end can be installed with a locking nut (27), and the rotating shaft (25) passes through the hole at the lower end of the bracket (28) and the hole of the adjusting screw (26), so as to connect the bracket (28) and the adjusting screw (26) together.

5. The movable double-folding workbench installed on the top of the cab according to claim 1, characterized in that: The primary folding positioning device (20) comprises an auxiliary washer (29), a neodymium magnet (30), a shell (31), and a cover (32). The shell (31) and the cover (32) are each provided with a semi-cylindrical groove. The neodymium magnet (30) and the auxiliary washer (29) are respectively placed in the semi-cylindrical grooves of the shell (31) and the cover (32). Then, the shell (31) and the cover (32) are connected together by screws.

6. The movable double-folding workbench installed on the top of the cab according to claim 1, characterized in that: The locking bracket (13) is installed on the keyboard frame (19) and is provided with a U-shaped hole, which is used to fix the locking mechanism (15).

7. The movable double-folding workbench installed on the top of the cab according to claim 1, characterized in that: The rotating shaft comprises a shaft (33), a washer (34) and a bushing (35). The washer (34) and the bushing (35) are sequentially inserted into the shaft (33) and connected together.

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