Crawler-mounted fork lift truck

Abstract

The application relates to the technical field of special vehicle manufacturing, and discloses a caterpillar type fork crane, which comprises a vehicle body, a caterpillar assembly arranged at the lower portion of the vehicle body, a fork lifting device arranged at one side of the vehicle body, the fork lifting device being used for driving goods to perform lifting movement, a lifting device rotatably arranged at the upper end of the vehicle body, the lifting device being used for driving the goods to perform movement in different directions and large-amplitude lifting movement, a supporting leg mechanism comprising a plurality of supporting legs, the supporting legs being capable of being telescopically extended in the vertical direction, the lower end surfaces of the supporting legs being connected with air bags, and air pumps for inflating and exhausting the air bags being arranged on each supporting leg. The application has the effects that the operation steps of the fork crane during operation are simplified, and the efficiency of engineering operation is greatly improved.

Description

Technical Field

[0001] This application relates to the technical field of special vehicle manufacturing, and in particular to a tracked forklift crane. Background Technology

[0002] A forklift crane is a modified version of an internal combustion forklift, equipped with lifting devices and outriggers. It can perform both cargo handling and lifting operations, achieving the dual functions of loading, unloading, and hoisting. This type of equipment avoids the need for multiple machines in traditional operations, thus greatly improving work efficiency.

[0003] Forklifts mainly consist of a chassis, lifting device, forklift assembly, and outrigger mechanism. The lifting device is folded and mounted on the upper surface of the chassis, the forklift assembly is mounted on the front side of the chassis, and the outrigger mechanism is mounted on the chassis. When the forklift is operating on soft ground, the ground may deform and sink due to the pressure from the outriggers, causing the chassis to tilt and significantly increasing the risk of tipping over. The current solution to this problem is to place a large-area pad under the outriggers to increase the bearing area and reduce ground pressure, thereby minimizing the risk of the soft ground deforming and sinking due to the pressure from the outriggers.

[0004] However, in the above-mentioned technology, when the forklift needs to operate on soft ground, the forklift may need to be moved according to the actual working conditions. After the forklift is moved, the workers need to move the pallet back to the designated location. As the position of the forklift changes, the workers need to move the pallet continuously. This process not only consumes a lot of manpower, but also greatly reduces the efficiency of the engineering operation. Summary of the Invention

[0005] The purpose of this application is to provide a tracked forklift that can minimize the need for repeated handling of pallets, thereby simplifying the operation of the forklift and greatly improving the efficiency of engineering operations.

[0006] The tracked forklift provided in this application adopts the following technical solution:

[0007] The vehicle body has a track assembly at the bottom;

[0008] A forklift device is installed on one side of the vehicle body, and the forklift device is used to lift and lower the goods.

[0009] The lifting device is rotatably mounted on the upper part of the vehicle body. The lifting device is used to move the goods in different directions and to lift them to a greater extent.

[0010] The outrigger mechanism includes multiple outriggers, each of which can extend and retract in the vertical direction. Each outrigger has an airbag connected to its lower end, and each outrigger is equipped with an air pump for inflating and deflating the airbag.

[0011] Optionally, the lower end face of the outrigger is provided with a receiving groove for accommodating the airbag. The air inlet on the airbag is fixedly connected to the groove wall of the receiving groove. The air pump is located in the receiving groove. When the air pump inflates, the airbag extends out of the receiving groove due to expansion. When the air pump deflates, the airbag is sucked into the receiving groove because the receiving groove is under negative pressure.

[0012] Optionally, when the airbag is inflated, the airbag is flat in shape.

[0013] Optionally, the receiving groove is provided with a detection component for detecting the air pressure inside the airbag.

[0014] Optionally, the outrigger is further provided with an adjustment component for adjusting the extension length of the outrigger, and the adjustment component is electrically connected to the detection component.

[0015] Optionally, a monitoring component is installed at the center of gravity when the vehicle body is in a horizontal state. The monitoring component can monitor the tilt direction and tilt angle of the vehicle body in real time, and the monitoring component is electrically connected to the adjustment component.

[0016] Optionally, the monitoring component includes a monitoring box, which is located at the center of gravity of the vehicle body. The monitoring box has a monitoring slot inside, and the number of slot walls along the vertical direction corresponds one-to-one with the number of outriggers. Pressure sensors are installed on multiple slot walls, and a monitoring ball is suspended inside the monitoring slot.

[0017] Optionally, the monitoring ball may simultaneously abut against multiple vertically arranged trench walls.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. When a forklift needs to perform lifting operations on soft ground, the airbag is first inflated using an air pump, causing it to expand and increase in volume. The forklift is then driven to the work site, extending its outriggers until the airbag on the outriggers touches the ground. When the work site needs to be changed, the outriggers shorten, lifting the airbag into the air. The forklift then moves, and when it reaches another work site, the outriggers extend again until the airbag touches the ground. Through the airbag and operation method described in this embodiment, workers do not need to repeatedly move pallets, greatly saving manpower and improving work efficiency. Simultaneously, the airbag has better elasticity than a pallet. On one hand, the airbag's elasticity can buffer some of the pressure from the outriggers, reducing the pressure on the ground and thus lowering the probability of the airbag sinking in soft ground. On the other hand, the airbag's elasticity allows it to better conform to uneven ground, increasing the contact area between the airbag and the ground, further reducing the pressure on the ground and further lowering the probability of the airbag sinking in soft ground.

[0020] 2. The design of the receiving slot facilitates the installation and storage of the airbag and air pump. The airbag is initially retracted within the receiving slot. When the airbag is needed, the air pump inflates it, causing the airbag to expand and be ejected from the receiving slot. When the airbag is no longer needed, the air pump deflates it, causing the airbag to collapse. Since the air in the receiving slot is also deflated, a negative pressure is created inside the receiving slot, which draws the collapsed airbag back into the receiving slot, thus achieving automatic airbag storage.

[0021] 3. The pressure sensor is set up to detect in real time whether the airbag is in a damaged state, so that the staff can replace the damaged airbag in time.

[0022] 4. The coordinated setup of pressure sensors and adjustment components enables real-time monitoring of the pressure within the airbags on each outrigger. When the pressure within one airbag rises from its initial value to a certain level, remains constant for a period, and then suddenly increases continuously, it indicates that the outrigger corresponding to that airbag is located on relatively soft ground. The airbag initially touches the soft ground, increasing its internal pressure. However, due to the relatively soft ground, the airbag continues to sink, preventing a significant increase in the overall external force it experiences, thus maintaining its internal pressure. When the airbag stops sinking, it is subjected to pressure from the outrigger, causing its internal pressure to increase continuously. Therefore, when the control center detects this change in the internal pressure of one outrigger's airbag, it indicates that the airbag is sinking, and the height of its corresponding outrigger is lower than that of other outriggers. The control center then extends the outrigger using the adjustment components to ensure that the vehicle body corresponding to that outrigger remains at the same height as the other outriggers, thereby ensuring the vehicle's balance and stability and reducing the risk of rollover.

[0023] 5. The combined use of detection and monitoring components provides a dual protection system. Firstly, this system more accurately determines whether the vehicle body is tilting, significantly reducing detection or monitoring errors. Secondly, the detection component on one outrigger consistently monitors the airbag pressure at its initial value. When the monitoring component detects the vehicle body tilting towards that outrigger, it indicates the airbag under that outrigger is suspended, suggesting a possible localized ground collapse. In this situation, the vehicle is in a relatively dangerous location, allowing the driver to immediately take safety precautions such as driving away or lowering heavy objects based on the displayed signals. Therefore, the simultaneous use of detection and monitoring components greatly improves the accuracy of the detected data and the driver's chances of survival in unexpected situations. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the support leg structure in an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the monitoring component in an embodiment of this application;

[0027] In the diagram, 1 is the vehicle body; 2 is the forklift device; 3 is the lifting device; 4 is the outrigger mechanism; 41 is the outrigger; 411 is the receiving slot; 42 is the airbag; 43 is the air pump; 6 is the detection component; 7 is the adjustment component; 8 is the monitoring component; 81 is the monitoring box; 811 is the monitoring slot; 82 is the monitoring ball; and 83 is the pressure sensor. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail below.

[0029] A tracked forklift, as shown in the reference Figure 1 and Figure 2 It includes the vehicle body 1, the forklift device 2, the lifting device 3, and the outrigger mechanism 4.

[0030] In this embodiment, the forklift device 2 is installed at the front end of the vehicle body 1, the lifting device 3 is rotatably installed on the upper surface of the vehicle body 1, and the lower surface of the vehicle body 1 is provided with tracks. The outrigger mechanism 4 in this embodiment includes multiple outriggers 41. In this embodiment, four outriggers 41 are provided. Of course, in other optional embodiments, the specific number of outriggers 41 depends on the specific situation. In this embodiment, the four outriggers 41 are respectively located at the four corners of the vehicle body 1. Each outrigger 41 can perform independent telescopic movement, and the vehicle body 1 is provided with four adjustment components 7 for driving the outriggers 41 to telescopic movement. The four adjustment components 7 correspond one-to-one with the four outriggers 41. In this embodiment, the adjustment components 7 are set as hydraulic cylinders. The lower surface of each outrigger 41 is connected to an airbag 42, and each outrigger 41 is provided with an independent air pump 43 for inflating and deflating the airbag 42.

[0031] When a forklift needs to perform lifting operations on soft ground, all air pumps 43 are first activated to inflate their respective airbags 42. All airbags 42 expand and increase in volume. Then, the forklift is driven to the designated area, and the four outriggers 41 are extended using the adjusting assembly 7 until the airbags 42 at the lower end of the outriggers 41 contact the ground. The expanded airbags 42 have a larger contact area with the ground compared to the bottom of the outriggers 41, thus increasing the bearing area of ​​the outriggers 41 and reducing ground pressure. This helps to prevent the soft ground from deforming and sinking due to the pressure of the outriggers 41. Therefore, in this embodiment, the airbags 42 are also designed to be flat. When the airbags 42 are inflated, their lower surfaces have a larger area, further increasing the airbag's bearing capacity. The contact area between the airbag 42 and the ground; when the work location needs to be changed, simply retract the outrigger 41 through the adjustment component 7 to move the airbag 42 into the air, then drive the forklift to another designated location, and then extend the outrigger 41 through the adjustment component 7 until the airbag 42 at the lower end of the outrigger 41 touches the ground. During the whole process, the staff no longer needs to repeatedly move the pad, which greatly saves manpower and improves work efficiency; when the lifting operation is not required, the air pump 43 empties the gas in the airbag 42, and the airbag 42 will shrink. The shrinking airbag 42 has a small volume and occupies little space, so it will not affect the other operation of the forklift. Moreover, the airbag 42 does not need to be manually moved and stored, further reducing the workload of the staff.

[0032] Meanwhile, the airbag 42 in this embodiment has better elasticity than the pad. Therefore, when the outrigger 41 applies pressure to the airbag 42, the elasticity of the airbag 42 itself can buffer some of the pressure from the outrigger 41, thereby reducing the pressure of the airbag 42 on the ground and thus reducing the probability of the airbag 42 sinking in soft soil. On the other hand, due to the elasticity of the airbag 42 itself, the airbag 42 can deform better than the pad, so that it can better conform to the uneven ground, thereby making the contact area between the airbag 42 and the ground larger, further reducing the pressure of the airbag 42 on the ground, and further reducing the probability of the airbag 42 sinking in soft soil.

[0033] It should be noted that the load capacity of the high-quality airbag 42 in the current technology can reach about 40 tons, while the weight of a small and medium-sized tracked forklift crane is about 20 tons, and the maximum load of a small and medium-sized tracked forklift crane is also about 20 tons. In this embodiment, four high-quality airbags 42 are used, which are fully capable of providing auxiliary support for the small and medium-sized tracked forklift crane. Therefore, in practical applications, there is no need to worry about the airbags 42 rupturing due to being unable to withstand the pressure.

[0034] In this embodiment, each of the four outriggers 41 has a receiving groove 411 at its lower end to accommodate the airbag 42. The airbag 42 is fixedly connected to the groove wall of the receiving groove 411, and the air inlet of the airbag 42 is connected to the receiving groove 411. The air pump 43 is located inside the receiving groove 411. The airbag 42 is initially located inside the receiving groove 411. When the forklift needs to perform forklift operations on soft ground, the air pump 43 is started to inflate the airbag 42. The gas output by the air pump 43 enters the airbag 42 through the receiving groove 411, and then the airbag 42 expands. The air is ejected from the receiving tank 411. As the air pump 43 continues to output air, the airbag 42 continues to expand until it is fully inflated, thus facilitating subsequent support work. When hoisting operations are not required, the air pump 43 is activated to evacuate the airbag 42. The gas inside the airbag 42 first enters the receiving tank 411 and is then extracted by the air pump 43. After the gas inside the airbag 42 is emptied, the airbag 42 contracts. Because the gas inside the airbag 42 first enters the receiving tank 411 and then flows away by the air pump 43, the air... When the airbag 42 contracts, it contracts along the direction close to the receiving groove 411. Once the gas in the receiving groove 411 is completely pumped out, the airbag 42 is forced into the receiving groove 411 under the influence of external atmospheric pressure. Therefore, during use, the airbag 42 can automatically inflate and retract, eliminating the need for additional retraction work by personnel and further reducing their workload. Simultaneously, the receiving groove 411 allows the airbag 42 to be retracted into the outrigger 41. On one hand, the receiving groove 411 can... It can provide some protection for the airbag 42 when it is not in use. On the other hand, when the forklift is operating on ground of normal hardness, there is no need to worry about the outrigger 41 sinking due to the small contact area between the outrigger 41 and the ground. Therefore, the airbag 42 will not be located between the airbag 42 and the ground, so the airbag 42 will not affect the supporting work of the outrigger 41. At the same time, it also avoids the airbag 42 from being damaged due to excessive compression and friction between the uninflated airbag 42 and the ground and the outrigger 41.

[0035] Secondly, refer to Figure 2 and Figure 3 In this embodiment, a detection component 6 for detecting the internal pressure of the airbag 42 is provided in the receiving groove 411.

[0036] In this embodiment, the detection component 6 is set as a pressure sensor. When the air pump 43 inputs a certain amount of gas into the airbag 42, there will be a certain pressure inside the airbag 42. If the pressure sensor detects that the pressure inside the airbag 42 continues to drop until the pressure inside the airbag 42 drops to the same as atmospheric pressure, it indicates that the airbag 42 is damaged. The pressure sensor will transmit this signal to the control center, and the control center will issue a corresponding alarm so that the staff can repair or replace the damaged airbag 42 in time.

[0037] Simultaneously, the detection component 6 in this embodiment can also be used in conjunction with the adjustment component 7. In this embodiment, the adjustment component 7 is set as a hydraulic cylinder, and the outrigger 41 is the output end of the hydraulic cylinder. When the forklift is performing lifting operations on soft ground, the air pumps 43 on the four outriggers 41 will start simultaneously to inflate their respective airbags 42. When the air pressure sensor detects that the pressure inside the airbag 42 reaches a certain value, the air pump 43 stops inflating. Then, the control center simultaneously starts the hydraulic cylinders on the four outriggers 41, and the output end of the hydraulic rod extends until the airbag 42 at the bottom of the outrigger 41 touches the ground. At this time, because the airbag 42 touches the ground... The ground exerts pressure on the airbag 42, causing it to be compressed. This compression reduces the airbag's volume, increasing the pressure inside. One of the outriggers 41, where the airbag 42 is in contact with soft ground, gradually sinks due to the pressure. While the airbag 42 is subjected to pressure from the ground and the outrigger 41, its continued downward movement indicates that the overall external force is downward. This downward movement of the outrigger 41 also indicates that the forklift crane's body 1 is tilting to some extent, with the tilt direction directly opposite the sinking outrigger 41. As the airbag 42 continues to descend after contacting the ground, its volume may remain unchanged or slightly decrease. This is because the pressure detected by the air pressure sensor inside the airbag 42 will not change or may increase slightly. However, when the outrigger 41 stops descending, and the vehicle body 1 tilts, its center of gravity will shift in the direction closer to the tilt of the vehicle body 1. Therefore, the outrigger 41 corresponding to this direction will experience more pressure from the vehicle body 1, and the airbag 42 corresponding to this outrigger 41 will also experience more pressure. Therefore, if the pressure detected by the air pressure sensor inside the airbag 42 increases from its initial normal value, then the airbag... If the pressure value within airbag 42 remains constant or changes slightly, and then suddenly rises, it indicates that the ground corresponding to airbag 42 and outrigger 41 has sunk. The control center will then control the hydraulic cylinder corresponding to outrigger 41 to extend. After the outrigger 41 extends, it can drive airbag 42 to continue to move downward, and then the airbag 42 will compact the soft ground to a certain extent, thereby preventing outrigger 41 and airbag 42 from moving further downward, and thus preventing the vehicle body 1 from continuing to tilt. This greatly reduces the probability of the vehicle body 1 overturning and significantly improves safety.

[0038] Furthermore, since the load that the airbag 42 can withstand also has a critical value, the hydraulic cylinder cannot extend indefinitely. The air pressure sensor can continuously detect the pressure inside the airbag 42. When the load on the airbag 42 is greater, the air pressure inside the airbag 42 is greater. Therefore, during the extension of the outrigger 41 driven by the hydraulic cylinder, the air pressure inside the airbag 42 will also increase. Therefore, a preset value can be set in the control center. This preset value is less than the critical value of the load on the airbag 42. When the air pressure inside the airbag 42 reaches this preset value, the hydraulic cylinder will no longer extend. When the extension of the hydraulic cylinder stops, the outrigger 41 is in a state where it will not burst the airbag 42, while still being able to bear the maximum weight of the forklift crane. The entire system has a high degree of automation, requiring no excessive monitoring by personnel, which greatly improves the practicality of this application.

[0039] In addition, a monitoring component 8 is also provided on the vehicle body 1 in this embodiment. The monitoring component 8 in this embodiment includes a monitoring box 81, which is located at the center of gravity of the vehicle body 1 when it is in a horizontal state. The monitoring box 81 has a monitoring slot 811 inside. In this embodiment, the monitoring slot 811 is set in a cuboid shape and is arranged vertically. The four slot walls arranged vertically inside the monitoring slot 811 correspond one-to-one with the four support legs 41, and the four slot walls arranged vertically inside the monitoring slot 811 are respectively arranged towards their respective support legs 41. A monitoring ball 82 is installed inside the monitoring trough 811. The monitoring ball 82 is suspended from the upper wall of the monitoring trough 811 by a rope. The monitoring ball 82 simultaneously abuts against the four vertically arranged walls of the monitoring trough 811. Pressure sensors 83 are installed on the four vertically arranged walls of the monitoring trough 811. When the vehicle body 1 is in a horizontal state, the rope on the monitoring ball 82 is in a vertical state, and there is no force interaction between the monitoring ball 82 and the four vertically arranged walls of the monitoring trough 811. All four pressure sensors 83 are electrically connected to the control center.

[0040] When vehicle body 1 is tilted, its center of gravity changes, causing the monitoring ball 82 to tend to move closer to the new center of gravity. However, because the monitoring ball 82 is in contact with the walls of the four vertically arranged monitoring slots 811, and these slot walls also change from vertical to tilted when vehicle body 1 is tilted, the monitoring ball 82 exerts pressure on the lowest-lying slot wall. The pressure sensor 83 on this lowest-lying slot wall measures the corresponding data and transmits it to the control center. The control center can then determine the location of the vehicle body 1 based on which slot wall transmitted the data. The control center determines the direction in which the vehicle body 1 tilts, and then activates the hydraulic cylinder on the corresponding outrigger 41 to extend or retract. Although this function is similar to that of the detection component 6, in practical applications, both methods can be used to simultaneously determine the direction in which the vehicle body 1 is tilting. If the data displayed by the pressure sensor 83 and the air pressure sensor both indicate that the vehicle body is tilting in the same direction, the resulting judgment is more accurate. This helps to avoid situations where the control center makes incorrect judgments due to data errors, failing to activate the hydraulic cylinder on the corresponding outrigger 41 in time, or activating the wrong hydraulic cylinder, which could lead to the vehicle body 1 overturning.

[0041] Meanwhile, the detection component 6 in this embodiment can detect which direction the vehicle body 1 is tilting, and the monitoring component 8 can also detect which component the vehicle body 1 is tilting towards. When the monitoring component 8 detects that the vehicle body 1 is tilting in one direction, and the air pressure in the airbag 42 on the outrigger 41 corresponding to that direction in the detection component 6 does not change and remains at the initial value, it indicates that the outrigger 41 corresponding to that tilt direction may be in a suspended state, that is, the ground directly below the outrigger 41 may have partially collapsed. Therefore, the local area is not suitable for hoisting operations. Upon receiving the signal, the control center will rotate the hoisting device 3 to adjust the center of gravity of the vehicle body 1 and then drive it away from the area as soon as possible, thereby further ensuring the safety of the staff.

[0042] Furthermore, in this embodiment, the pressure sensor 83 can also determine the tilt angle of the vehicle body 1 based on the value measured by the pressure sensor 83. The main calculation principle is based on trigonometric functions. Since the pressure on the pressure sensor 83 comes from the monitoring ball 82, and the pressure exerted by the monitoring ball 82 is a component of its own weight, the angle of tilt of the rope suspending the monitoring ball 82 can be calculated using trigonometric functions, i.e., the angle of tilt of the monitoring groove 811 wall, thus determining the angle of tilt of the vehicle body 1. In practical applications, there is a critical value for the angle at which the vehicle body 1 can tilt. If the tilt angle of vehicle body 1 exceeds this critical value, the vehicle body 1 is very likely to overturn. Therefore, a preset value can be set in the control center. This preset value should be less than the critical value. When the tilt angle of vehicle body 1 reaches this preset value, the control center will issue an alarm. Then, the staff will immediately stop the lifting operation and can adjust the center of gravity of vehicle body 1 to the opposite direction of the tilt by rotating the lifting device 3. Then, the forklift will be started immediately and driven away from the location. The monitoring component 8 can minimize the risk of vehicle body 1 overturning, thereby greatly improving the safety of this forklift.

[0043] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A tracked forklift, characterized in that, include: The vehicle body (1) has a track assembly at the bottom; A forklift device (2) is installed on one side of the vehicle body (1). The forklift device (2) is used to lift and lower the goods. The lifting device (3) is rotatably installed on the upper end of the vehicle body (1). The lifting device (3) is used to drive the goods to move in different directions and to lift them to a greater extent. The outrigger mechanism (4) includes multiple outriggers (41), each of which can extend and retract in the vertical direction. Each outrigger (41) has an airbag (42) connected to its lower end face, and each outrigger (41) is equipped with an air pump (43) for inflating and deflating the airbag (42). The lower end face of the support leg (41) is provided with a receiving groove (411) for accommodating the airbag (42). The air inlet on the airbag (42) is fixedly connected to the groove wall of the receiving groove (411). The air pump (43) is located in the receiving groove (411). When the air pump (43) inflates, the airbag (42) extends out of the receiving groove (411) due to expansion. When the air pump (43) evacuates, the airbag (42) is sucked into the receiving groove (411) because the receiving groove (411) is in a negative pressure state. The receiving groove (411) is provided with a detection component (6) for detecting the air pressure inside the airbag (42). The support leg (41) is also provided with an adjustment component (7) for adjusting the extension length of the support leg (41), and the adjustment component (7) is electrically connected to the detection component (6); A monitoring component (8) is installed at the center of gravity of the vehicle body (1) when it is in a horizontal state. The monitoring component (8) can monitor the tilt direction and tilt angle of the vehicle body (1) in real time. The monitoring component (8) is electrically connected to the adjustment component (7).

2. The tracked forklift crane according to claim 1, characterized in that, When the airbag (42) is inflated, the shape of the airbag (42) is flat.

3. A tracked forklift crane according to claim 1, characterized in that, The monitoring component (8) includes a monitoring box (81), which is located at the center of gravity of the vehicle body (1). The monitoring box (81) has a monitoring slot (811) inside. The number of vertical slot walls of the monitoring slot (811) corresponds one-to-one with the number of outriggers (41), and pressure sensors (83) are provided on multiple slot walls. A monitoring ball (82) is suspended inside the monitoring slot (811).

4. A tracked forklift crane according to claim 3, characterized in that, The monitoring ball (82) simultaneously comes into contact with multiple vertically arranged trench walls.

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