Comparison analysis device for engineering audit based on rapid positioning function

Abstract

The invention discloses a comparison analysis device for engineering auditing based on a rapid positioning function, and relates to the technical field of detection analysis equipment, the comparison analysis device comprises an analysis vehicle, the analysis vehicle is composed of a driving chassis, a cab and a central control unit, the comparison analysis device further comprises an infrared measuring instrument, a supporting assembly plate, a feedback assembly and four supporting assemblies, the infrared measuring instrument is arranged on the cab, the supporting assembly plate is installed in the driving chassis, the feedback assembly and the four supporting assemblies are all installed on the supporting assembly plate, the feedback assembly and each supporting assembly are connected with the central control unit, and the feedback assembly and the four supporting assemblies horizontally support the analysis vehicle. The device drives to a specified parking measurement point, the four supporting assemblies are controlled by the central control unit to fall to fix the whole analysis vehicle to the parking measurement point, the infrared measurement instrument is controlled to measure field data, and the field data are transmitted to the data background processing module box in real time.

Description

Technical Field

[0001] This invention relates to the field of detection and analysis equipment technology, specifically a comparative analysis device for engineering auditing based on rapid positioning function. Background Technology

[0002] As a crucial link in ensuring the authenticity and compliance of engineering projects, engineering auditing has long relied on on-site inspections by technical personnel and manual comparison of drawings to verify the consistency between the actual construction content and the design documents. While traditional methods have some operability, they have obvious limitations. Manual measurement and comparison are inefficient and errors are difficult to avoid, making it difficult to achieve rapid and accurate verification over a large area and at multiple measurement points. Especially in complex construction sites, problems such as incomplete data acquisition and difficulty in matching drawings with the actual scene are prominent, seriously affecting the accuracy and timeliness of audit results.

[0003] With the deepening of the concepts of smart construction and digital auditing, there is an urgent need to introduce intelligent and integrated on-site measurement and comparison methods to achieve efficient and accurate engineering quantity auditing. To this end, this invention proposes an engineering audit comparison and analysis device based on rapid positioning function, which integrates a mobile vehicle body, an infrared measurement system and an intelligent leveling support structure. Through a mechanical feedback leveling mechanism, it improves the automation level and data reliability of engineering auditing, and promotes the transformation of auditing operations towards digitalization and intelligence. Summary of the Invention

[0004] The purpose of this invention is to provide a comparative analysis device for engineering auditing based on rapid positioning function, so as to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a comparative analysis device for engineering auditing based on rapid positioning function, comprising an analysis vehicle, the analysis vehicle consisting of a drive chassis, a driver's cab, and a central control unit. The comparative analysis device further includes an infrared measuring instrument, a support mounting plate, a feedback component, and four support components. The infrared measuring instrument is mounted on the driver's cab, the support mounting plate is mounted in the drive chassis, and the feedback component and the four support components are all mounted on the support mounting plate. The feedback component and each support component are connected to the central control unit. The feedback component and the four support components provide horizontal support for the analysis vehicle. The device travels to a designated parking measurement point, and the central control unit controls the four support components to descend and fix the entire analysis vehicle at the parking measurement point. The infrared measuring instrument is then controlled to measure on-site data and transmit it in real time to the data backend processing module box.

[0006] Furthermore, the feedback component is installed in the middle of the support assembly plate, and the feedback component includes four long tie rods, each of which is slidably connected to the support assembly plate, and each long tie rod is provided with a limit post;

[0007] The four support components are arranged in an X-shape, and the four limiting posts block the four support components respectively.

[0008] Furthermore, the feedback component includes a transfer frame, a counterweight, and an extension rod. The transfer frame is connected to the bottom of the support assembly plate via a bracket. The counterweight is connected to the middle of the transfer frame, and the transfer axis of the counterweight is spatially perpendicular to the transfer axis of the transfer frame. The extension rod is installed on the top of the counterweight. Regardless of whether the ground where the analysis vehicle is parked is flat, the counterweight always remains perpendicular to the horizontal plane under the action of gravity. When the analysis vehicle is stationary, if the vehicle body is not upright, the distance from the center of the extension rod to the four corners of the vehicle body will not be consistent, and the end of the extension rod will be closer to the higher side of the vehicle body.

[0009] Furthermore, the feedback component also includes a tray with an open center and a shock-absorbing rubber pad. The extension rod passes through the center of the tray, and a T-shaped groove is formed on the outer contour of the tray. Each long pull rod has a cylindrical protrusion on the side away from the limiting post. The cylindrical protrusion slides in the T-shaped groove. Under the constraint of the long pull rod, the tray can only move in one plane. Under the push of the extension rod, the closer the tray is to the higher side of the vehicle body, the more the tray pushes the long pull rod. The higher the side of the vehicle body, the deeper the long pull rod is pushed in, and the lower the side of the vehicle body, the more the long pull rod is pulled out.

[0010] Furthermore, each of the support components includes a drive slide rail, a support slide rail, a drive slider, and a driven slider. The drive slide rail is perpendicular to the support slide rail. The drive slider is slidably mounted in the drive slide rail, and the driven slider is slidably mounted in the support slide rail. A connecting rod connects the drive slider and the driven slider. The limiting post passes through the support assembly plate and extends into the drive slide rail. The position of the limiting post in the drive slide rail varies depending on the direction of movement of the long pull rod. When the support hydraulic cylinder pushes the drive slider to move via the spring, the drive slider stops when it hits the limiting post. Even if the support hydraulic cylinder continues to work, the spring continues to compress, making it impossible to push the drive slider to move.

[0011] Furthermore, each of the support components includes a support hydraulic cylinder and a spring, which are located in the drive slide rail. The support hydraulic cylinder is positioned on the side of the drive slider away from the driven slider, and the spring is positioned between the support hydraulic cylinder and the drive slider. A dust cover is provided on the outside of the spring. The support hydraulic cylinder is connected to the central control unit via a hydraulic pipeline. The more the long pull rod is pulled out, the longer the distance the drive slider moves; the more the long pull rod is pushed in, the shorter the distance the drive slider moves. That is, the drive slider moves a shorter distance on the side with a higher vehicle body and a longer distance on the side with a lower vehicle body.

[0012] Furthermore, each of the support components also includes a support rod and a foot support. The support rod is located at the bottom of the driven slider, and the foot support is connected to the bottom of the support rod. The drive slider pushes the driven slider to slide the same distance via a connecting rod. The driven slider supports the analysis vehicle through the support rod and the foot support. The higher side of the vehicle body is supported to a shorter height, and the lower side of the vehicle body is supported to a greater height. By using mechanical structure to provide feedback on the vehicle body's attitude, the vehicle body can be leveled, avoiding electronic errors and ensuring reliable operation.

[0013] Furthermore, a pair of clamping assemblies are symmetrically arranged on the support assembly plate. Each clamping assembly includes a locking hydraulic cylinder, a wedge-shaped push block, and a clamping device. The wedge-shaped push block is mounted on the locking hydraulic cylinder, and the clamping device is slidably mounted on the support assembly plate. The clamping device has clamping rings at both ends, and a pair of long pull rods pass through the two clamping rings respectively. The wedge-shaped push block is in contact with the clamping device. The locking hydraulic cylinder is connected to the central control unit through a hydraulic pipeline. In order to prevent the drive slider from hitting the limit post and returning, the locking hydraulic cylinder works first before the support hydraulic cylinder works, pushing the wedge-shaped push block forward, causing the clamping device to move upward. The clamping rings lock the long pull rods to prevent them from moving under force.

[0014] Furthermore, four wheels are mounted on both sides of the drive chassis, and the four wheels are solid tires. The cab is equipped with a driver's cab, an operator's seat, a data processing module box, an operating panel, and a drawing comparison display screen. The data processing module box analyzes the data from the infrared measuring instrument, automatically draws on-site drawings, and automatically calculates the volume of the object to be measured, converting and displaying it on the automatically drawn drawings. The drawing comparison display screen overlays the drawings and the drawings automatically drawn by the data processing module box according to the reference points and displays them with lines of different colors, automatically comparing the drawings and automatically calculating the difference in on-site engineering quantities to audit the engineering quantities on the project site.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This invention measures on-site data using an infrared measuring instrument, calculates the on-site data and draws on-site diagrams using a data processing module, and automatically overlays and compares the drawings with the on-site diagrams using a drawing comparison display to calculate the difference in engineering quantities. It can implement intelligent engineering auditing through non-contact measurement at various stopping measurement points during the device's movement. This solves the problems of traditional engineering auditing, such as the inability to intelligently and accurately compare on-site construction conditions with drawings, and the large workload and low accuracy of manual comparison. By adopting digital and intelligent methods, it ensures the professionalism, compliance, and rationality of engineering auditing and effectively prevents audit risks.

[0017] 2. Through the coordinated action of a mechanical feedback leveling mechanism and multiple components, the vehicle body can be autonomously leveled on uneven terrain, effectively ensuring the stability of the measuring equipment and the accuracy of data acquisition, avoiding electronic sensor errors, and improving the system's adaptability and reliability in complex environments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of the vehicle analyzed in this invention;

[0020] Figure 3 This is a schematic diagram of the structure of the supporting assembly plate of the present invention;

[0021] Figure 4 This is a schematic diagram of the internal structure of the support assembly plate of the present invention;

[0022] Figure 5 This is a partial structural schematic diagram of the feedback component of the present invention;

[0023] Figure 6 This is a partial structural schematic diagram of the support component of the present invention.

[0024] In the diagram: 1. Analysis vehicle; 2. Infrared measuring instrument; 3. Support assembly plate; 4. Adapter frame; 5. Counterweight; 6. Extension rod; 7. Groove plate; 8. Long tie rod; 9. Limiting post; 10. Locking hydraulic cylinder; 11. Wedge push block; 12. Clamping device; 13. Drive slide rail; 14. Support slide rail; 15. Support hydraulic cylinder; 16. Dust cover; 17. Drive slider; 18. Connecting rod; 19. Driven slider; 20. Support rod; 21. Foot support; 22. Feedback component; 23. Support component. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example: Figures 1-6As shown, the present invention provides a technical solution: a comparison and analysis device for engineering auditing based on rapid positioning function, including an analysis vehicle 1. The analysis vehicle 1 consists of a drive chassis, a driver's cab, and a central control unit. The comparison and analysis device also includes an infrared measuring instrument 2, a support mounting plate 3, a feedback component 22, and four support components 23. The infrared measuring instrument 2 is mounted on the driver's cab, the support mounting plate 3 is mounted in the drive chassis, and the feedback component 22 and the four support components 23 are all mounted on the support mounting plate 3. The feedback component 22 and each support component 23 are connected to the central control unit. The feedback component 22 and the four support components 23 provide horizontal support for the analysis vehicle 1. Four wheels are mounted on both sides of the drive chassis, and the four wheels are solid tires. The driver's cab is equipped with a driver's platform, an operator's seat, a data backend processing module box, an operating console, and a drawing comparison display screen.

[0027] The device travels to a designated parking measurement point, and the central control unit controls the four support components 23 to lower and fix the entire analysis vehicle 1 at the parking measurement point. It then controls the infrared measuring instrument 2 to measure the on-site data and transmits it to the data back-end processing module box in real time. The data back-end processing module box analyzes the data from the infrared measuring instrument 2, automatically draws on-site drawings, and automatically calculates the volume of the objects to be measured, converting and displaying it on the automatically drawn drawings. The drawing comparison display screen overlays the drawings and the drawings automatically drawn by the data back-end processing module box according to the reference points and displays them with different colored lines. It automatically compares the drawings and automatically calculates the difference in on-site engineering quantities to audit the engineering quantities on the project site.

[0028] Feedback component 22 is installed in the middle of support assembly plate 3. Feedback component 22 includes four long tie rods 8, each of which is slidably connected to support assembly plate 3. Each long tie rod 8 is provided with a limit post 9. The four support components 23 are arranged in an X shape. The four limit posts 9 respectively block the four support components 23. Feedback component 22 includes a transition frame 4, a counterweight 5 and an extension rod 6. The transition frame 4 is connected to the bottom of support assembly plate 3 through a bracket. The counterweight 5 is connected to the middle of the transition frame 4. The transition axis of the counterweight 5 is spatially perpendicular to the transition axis of the transition frame 4. The extension rod 6 is installed on the top of the counterweight 5. Regardless of whether the ground where the analysis vehicle 1 is parked is flat, the counterweight 5 always remains perpendicular to the horizontal plane under the action of gravity. When the analysis vehicle 1 is parked, if the vehicle body is not upright, the distance from the center of the extension rod 6 to the four corners of the vehicle body will not be consistent. The end of the extension rod 6 is closer to the higher side of the vehicle body.

[0029] The feedback component 22 also includes a tray 7, which has an open center and is equipped with a shock-absorbing rubber pad. An extension rod 6 passes through the center of the tray 7. A T-shaped groove is provided on the outer contour of the tray 7. A cylindrical protrusion is provided on the side of each long tie rod 8 away from the limiting post 9. The cylindrical protrusion slides in the T-shaped groove. Under the constraint of the long tie rod 8, the tray 7 can only move in one plane. Under the push of the extension rod 6, the closer the tray 7 is to the higher side of the vehicle body, the more the tray 7 pushes the long tie rod 8 to move. The higher the side of the vehicle body, the deeper the long tie rod 8 is pushed in. The lower the side of the vehicle body, the more the long tie rod 8 is pulled out.

[0030] A pair of clamping assemblies are symmetrically arranged on the support assembly plate 3. Each clamping assembly includes a locking hydraulic cylinder 10, a wedge-shaped push block 11, and a clamping device 12. The wedge-shaped push block 11 is mounted on the locking hydraulic cylinder 10, and the clamping device 12 is slidably mounted on the support assembly plate 3. The clamping device 12 has clamping rings at both ends. A pair of long pull rods 8 pass through the two clamping rings respectively. The wedge-shaped push block 11 contacts the clamping device 12. The locking hydraulic cylinder 10 is connected to the central control unit through a hydraulic pipeline. In order to prevent the drive slider 17 from hitting the limit post 9 and returning, the locking hydraulic cylinder 10 works first before the support hydraulic cylinder 15 works, pushing the wedge-shaped push block 11 forward, causing the clamping device 12 to move upward. The clamping rings lock the long pull rods 8 to prevent them from moving under force.

[0031] Each support assembly 23 includes a drive slide rail 13, a support slide rail 14, a drive slider 17, and a driven slider 19. The drive slide rail 13 is perpendicular to the support slide rail 14. The drive slider 17 is slidably installed in the drive slide rail 13, and the driven slider 19 is slidably installed in the support slide rail 14. A connecting rod 18 connects the drive slider 17 and the driven slider 19. A limiting post 9 passes through the support mounting plate 3 and extends into the drive slide rail 13. Each support assembly 23 includes a support hydraulic cylinder 15 and a spring. The support hydraulic cylinder 15 and the spring are located in the drive slide rail 13. The support hydraulic cylinder 15 is located on the side of the drive slider 17 away from the driven slider 19. The spring is located between the support hydraulic cylinder 15 and the drive slider 17. A dust cover 16 is provided on the outside of the spring. The support hydraulic cylinder 15 is connected to the central control unit through a hydraulic pipeline. Each support assembly 23 also includes a support rod 20 and a foot support 21. The support rod 20 is located at the bottom of the driven slider 19, and the foot support 21 is connected to the bottom of the support rod 20.

[0032] As the long pull rod 8 moves in different directions, the position of the limiting post 9 in the drive slide rail 13 also varies. When the support hydraulic cylinder 15 pushes the drive slider 17 to move via the spring, the drive slider 17 stops when it hits the limiting post 9. Even if the support hydraulic cylinder 15 continues to work, the spring continues to compress and cannot push the drive slider 17 to move. The more the long pull rod 8 is pulled out, the longer the distance the drive slider 17 moves; the more the long pull rod 8 is pushed in, the shorter the distance the drive slider 17 moves. That is, the drive slider 17 moves a shorter distance on the side with a higher body and a longer distance on the side with a lower body. The drive slider 17 pushes the driven slider 19 to slide the same distance via the connecting rod 18. The driven slider 19 supports the analysis vehicle 1 via the support rod 20 and the foot support 21. The higher side of the vehicle is supported to a shorter height, and the lower side is supported to a greater height. By using the mechanical structure to provide feedback on the vehicle's posture, the vehicle's level is adjusted, avoiding electronic errors and ensuring reliable operation.

[0033] The working principle of this invention is as follows: The device travels to a designated parking measurement point, and the central control unit controls the four support components 23 to descend and fix the entire analysis vehicle 1 at the parking measurement point. The infrared measuring instrument 2 is controlled to measure the on-site data and transmit it to the data back-end processing module box in real time. The data back-end processing module box analyzes the data from the infrared measuring instrument 2, automatically draws on-site drawings, and automatically calculates the volume of the object to be measured. The converted volume is displayed on the automatically drawn drawing. The drawing comparison display screen overlays the drawing and the drawing automatically drawn by the data back-end processing module box according to the reference point and displays them with different colored lines. The drawings are automatically compared, and the difference in on-site engineering quantities is automatically calculated to audit the engineering quantities on the project site.

[0034] Regardless of whether the ground where the analysis vehicle 1 is parked is flat or not, the counterweight 5 will always remain perpendicular to the horizontal plane under the action of gravity. When the analysis vehicle 1 is stationary, if the vehicle body is not upright, the distance from the center of the extension rod 6 to the four corners of the vehicle body will not be consistent, and the end of the extension rod 6 will be closer to the higher side of the vehicle body.

[0035] Under the constraint of the long tie rod 8, the tray 7 can only move in one plane. Under the push of the extension rod 6, the closer the tray 7 is to the higher side of the vehicle body, the more the tray 7 pushes the long tie rod 8 to move. The higher the side of the vehicle body, the deeper the long tie rod 8 is pushed in, and the lower the side of the vehicle body, the more the long tie rod 8 is pulled out. In order to prevent the drive slider 17 from hitting the limit post 9 and returning, the locking hydraulic cylinder 10 works first before the support hydraulic cylinder 15 works, pushing the wedge push block 11 forward, causing the clamping device 12 to move upward, and the clamping ring locks the long tie rod 8 to prevent it from moving under force.

[0036] As the long pull rod 8 moves in different directions, the position of the limiting post 9 in the drive slide rail 13 also varies. When the support hydraulic cylinder 15 pushes the drive slider 17 to move via the spring, the drive slider 17 stops when it hits the limiting post 9. Even if the support hydraulic cylinder 15 continues to work, the spring continues to compress and cannot push the drive slider 17 to move. The more the long pull rod 8 is pulled out, the longer the distance the drive slider 17 moves; the more the long pull rod 8 is pushed in, the shorter the distance the drive slider 17 moves. That is, the drive slider 17 moves a shorter distance on the side with a higher body and a longer distance on the side with a lower body. The drive slider 17 pushes the driven slider 19 to slide the same distance via the connecting rod 18. The driven slider 19 supports the analysis vehicle 1 via the support rod 20 and the foot support 21. The higher side of the vehicle is supported to a shorter height, and the lower side is supported to a greater height. By using the mechanical structure to provide feedback on the vehicle's posture, the vehicle's level is adjusted, avoiding electronic errors and ensuring reliable operation.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A comparison analysis device for engineering audit based on rapid positioning function, comprising an analysis vehicle (1) composed of a driving chassis, a cab and a central control unit, characterized in that: The comparison and analysis device further comprises an infrared measuring instrument (2), a support assembly plate (3), a feedback assembly (22) and four support assemblies (23), the infrared measuring instrument (2) is arranged on the cab, the support assembly plate (3) is installed in the drive chassis, the feedback assembly (22) and the four support assemblies (23) are both installed on the support assembly plate (3), the feedback assembly (22) and each support assembly (23) are connected with the central control unit, and the feedback assembly (22) and the four support assemblies (23) horizontally support the analysis vehicle (1).

2. The comparison analysis device for engineering audit based on quick positioning function according to claim 1, characterized in that: The feedback assembly (22) is installed in the middle of the support assembly plate (3), the feedback assembly (22) comprises four long pull rods (8), each long pull rod (8) is in sliding connection with the support assembly plate (3), and a limiting column (9) is arranged on each long pull rod (8); The four support assemblies (23) are arranged in an X shape, and the four limiting columns (9) block the four support assemblies (23) respectively.

3. The comparison analysis device for engineering audit based on quick positioning function according to claim 2, characterized in that: The feedback assembly (22) comprises an adapter frame (4), a counterweight block (5) and an extension rod (6), the adapter frame (4) is adapted to the bottom of the support assembly plate (3) through a support, the counterweight block (5) is adapted in the middle of the adapter frame (4), the adaptation axis of the counterweight block (5) is perpendicular to the adaptation axis of the adapter frame (4) in space, and the extension rod (6) is installed at the top of the counterweight block (5).

4. The comparison analysis device for engineering audit based on quick positioning function according to claim 3, characterized in that: The feedback assembly (22) further comprises a groove disc (7), the middle of the groove disc (7) is open and provided with a shock-absorbing rubber pad, the extension rod (6) passes through the middle of the groove disc (7), T-shaped sliding grooves are formed in the outer contour of the groove disc (7), each long pull rod (8) is provided with a cylindrical protrusion on the side away from the limiting column (9), and the cylindrical protrusion is in sliding fit in the T-shaped sliding groove.

5. The comparison analysis device for engineering audit based on quick positioning function according to claim 2, characterized in that: Each support assembly (23) comprises a driving slide rail (13), a supporting slide rail (14), a driving sliding block (17) and a driven sliding block (19), the driving slide rail (13) and the supporting slide rail (14) are arranged perpendicularly, the driving sliding block (17) is slidably installed in the driving slide rail (13), the driven sliding block (19) is slidably installed in the supporting slide rail (14), a connecting rod (18) is adapted between the driving sliding block (17) and the driven sliding block (19), and the limiting column (9) penetrates through the support assembly plate (3) and extends into the driving slide rail (13).

6. The comparison analysis device for engineering audit based on quick positioning function according to claim 5, characterized in that: Each support assembly (23) comprises a supporting hydraulic cylinder (15) and a spring, the supporting hydraulic cylinder (15) and the spring are located in the driving slide rail (13), the supporting hydraulic cylinder (15) is arranged on the side of the driving sliding block (17) away from the driven sliding block (19), the spring is arranged between the supporting hydraulic cylinder (15) and the driving sliding block (17), a dustproof sleeve (16) is arranged on the outer side of the spring, and the supporting hydraulic cylinder (15) is connected with the central control unit through a hydraulic pipeline.

7. The comparison analysis device for engineering audit based on quick positioning function according to claim 5, characterized in that: Each support assembly (23) further comprises a support rod (20) and a foot prop (21), the support rod (20) is arranged at the bottom of the driven sliding block (19), and the foot prop (21) is connected to the bottom of the support rod (20).

8. The comparison analysis device for engineering audit based on quick positioning function according to claim 2, characterized in that: A pair of pressing assemblies are symmetrically arranged on the support assembly plate (3), each pressing assembly comprises a locking hydraulic cylinder (10), a wedge-shaped push block (11) and a presser (12), the wedge-shaped push block (11) is installed on the locking hydraulic cylinder (10), the presser (12) is slidingly installed on the support assembly plate (3), the presser (12) is provided with a pressing ring at both ends, a pair of long pull rods (8) pass through the two pressing rings respectively, the wedge-shaped push block (11) is in contact with the presser (12), and the locking hydraulic cylinder (10) is connected with the central control unit through a hydraulic pipeline.

9. The comparison analysis device for engineering audit based on quick positioning function according to claim 1, characterized in that: Four wheels are installed on both sides of the driving chassis, the four wheels are solid tires, a driver's cab is arranged in the cab, an operator's seat, a data back-end processing module box, an operation table and a drawing comparison display screen are arranged in the cab.

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