Adjustable foundation pit supporting device

Abstract

The invention discloses an adjustable foundation pit supporting device, and belongs to the technical field of foundation pit supporting, the adjustable foundation pit supporting device comprises a bottom plate, mounting grooves are formed in the peripheral side walls of the bottom plate, and protection assemblies are arranged on the inner walls of the mounting grooves; according to the device, the protection assembly is arranged, a knocking rod moves back and forth in a fixing frame under the action of a telescopic spring and a fixing ring, a knocked protection plate can vibrate, and soil on the pit wall is more compact under the cooperation of an extrusion plate; according to the foundation pit supporting device, soil on the pit wall can be more compact through extrusion and knocking in the foundation pit supporting process, the fixity of the soil on the pit wall of the foundation pit is improved, the stability of the foundation pit supporting device is further guaranteed, and the safety of the foundation pit supporting device is improved; and knocking vibration can shake off soil adhering to the protection plate and the extrusion plate, the foundation pit supporting device is automatically cleaned, the cleanliness of the foundation pit supporting device is improved, and then the durability of the foundation pit supporting device is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of foundation pit support, and in particular relates to an adjustable foundation pit support device. Background Art

[0002] The foundation pit is a soil pit excavated at the foundation design location according to the base elevation and foundation plane dimensions. Before excavation, the excavation plan should be determined based on geological and hydrological data and the situation of nearby buildings on site, and waterproofing and drainage work should be done. If the excavation is not deep, the slope can be used to stabilize the soil slope. The slope size is determined according to relevant construction regulations. Support is to ensure the safety of underground structure construction and the surrounding environment of the foundation pit. The support, reinforcement and protection measures for the side walls and the surrounding environment are adopted. In order to ensure the stability of the support in the foundation pit support, it is necessary to use supporting devices to support the foundation pit.

[0003] A Chinese patent discloses a foundation pit support device (CN116696146A), comprising: a protective mechanism and a warning mechanism; the protective mechanism comprises two fixed piles, each of the adjacent sides of the two fixed piles is provided with a groove, and a fence is inserted into the groove; the warning mechanism comprises two blocks, and the two blocks are respectively fixedly connected to the two fixed piles; the foundation pit support device is provided with the protective mechanism and the warning mechanism, so that after the arc plate is placed on the block, the arc plate can be fixed by screwing the threaded rod into the threaded groove, so that after the warning light strip is placed in the light strip groove, the block can drive the movable plate to move downward under the action of the spring, so that the clamping plate can cover the light strip groove, thereby preventing the warning light strip from falling from the light strip groove; through the above arrangement, the problem that passing vehicles and pedestrians cannot find the foundation pit in time when the support fence is used at night is solved, and the safety hazard is eliminated.

[0004] The foundation pit support device is mainly used to block the soil on the pit wall of the foundation pit, but most of the current foundation pit support devices directly block the soil. When the foundation pit is excavated, the soil around the foundation pit is vibrated, so the soil is relatively loose and not compact enough. During the foundation pit support process, the soil is easy to collapse, thereby generating pressure on the foundation pit support device. On the one hand, the safety of the foundation pit support device is reduced. On the other hand, the foundation pit support device is prone to damage due to long-term pressure, which reduces the durability of the foundation pit support device. For this purpose, an adjustable foundation pit support device is provided. Summary of the invention

[0005] The purpose of the present invention is to propose an adjustable foundation pit support device in order to solve the problem that the soil in the foundation pit support device is prone to collapse during the support process, which generates pressure on the foundation pit support device and reduces the safety and durability of the foundation pit support device.

[0006] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: an adjustable foundation pit support device, comprising a bottom plate, the four side walls of the bottom plate are provided with mounting grooves, the inner wall of the mounting groove is provided with a protection component, and the upper surface of the bottom plate is provided with an adjustment component and a stabilization component;

[0007] The protective assembly includes four protective plates, and the two side walls of the four protective plates are rotatably connected to the two side inner walls of four mounting grooves through rotating shafts. An electric telescopic rod is fixedly installed on the side walls of the protective plates, and a groove is provided on the other side wall of the protective plate. One end of the electric telescopic rod extends into the groove and is fixedly installed with an extrusion plate, and the extrusion plate is adapted to the size of the groove.

[0008] As a further description of the above technical solution:

[0009] A fixed rack is fixedly installed on the side wall of the extrusion plate, one end of the fixed rack extends outside the side wall of the protective plate, a support plate is fixedly installed on the side wall of the protective plate, a rotating rod is fixedly installed on the upper surface of the support plate, a transmission gear is fixedly installed on the outer surface of the rotating rod, and the transmission gear is meshed and connected with the fixed rack.

[0010] As a further description of the above technical solution:

[0011] A rotating disk is fixedly mounted on the upper surface of the rotating rod, a protrusion is fixedly mounted on the outer surface of the rotating disk, a fixing frame is fixedly mounted on the side wall of the protective plate, a telescopic spring is fixedly mounted on the side wall of the fixing frame, and a fixing ring is fixedly mounted on one end of the telescopic spring.

[0012] As a further description of the above technical solution:

[0013] A knocking rod is fixedly installed on the inner wall of the fixing ring, one end of the knocking rod is in contact with the outer surface of the rotating disk, the other end of the knocking rod passes through the interior of the telescopic spring and extends to the other side wall of the fixing frame, and the other end of the knocking rod is in contact with the side wall of the protective plate.

[0014] As a further description of the above technical solution:

[0015] The adjustment assembly includes a dust cover, the lower surface of the dust cover is fixedly connected to the upper surface of the base plate, a self-locking motor is fixedly installed on the inner wall of the dust cover, a threaded column is fixedly installed on the output end of the self-locking motor, and one end of the threaded column extends outside the upper surface of the dust cover.

[0016] As a further description of the above technical solution:

[0017] A threaded sleeve is threadedly installed on the outer surface of the threaded column, and four mounting clips are fixedly installed on the outer surface of the threaded sleeve. A connecting rod is rotatably installed on the inner wall of the mounting clip via a rotating shaft, and a connecting clip is rotatably installed on one end of the connecting rod via a rotating shaft, and the side wall of the connecting clip is fixedly connected to the side wall of the protective plate.

[0018] As a further description of the above technical solution:

[0019] The stabilizing assembly comprises four limiting rods and a movable frame. One end of the four limiting rods is respectively fixedly connected to the surrounding side walls of the dust cover. A sliding cylinder is slidably mounted on the outer surface of the limiting rod.

[0020] As a further description of the above technical solution:

[0021] A fixing clamp is rotatably mounted on one end of the slide cylinder through a rotating shaft, a side wall of the fixing clamp is fixedly connected to a side wall of the protective plate, and an extrusion inclined block is fixedly mounted on the lower surface of the slide cylinder.

[0022] As a further description of the above technical solution:

[0023] A plurality of connecting springs are fixedly mounted on the lower surface of the movable frame, one end of each connecting spring is fixedly connected to the upper surface of the bottom plate, and four positioning cones are fixedly mounted on the lower surface of the movable frame, one end of each positioning cone extends out of the lower surface of the bottom plate.

[0024] As a further description of the above technical solution:

[0025] A fixing rod is fixedly installed on the inner surface of the movable frame, one end of the fixing rod is provided with a notch, a pulley is rotatably installed on the inner wall of the notch through a rotating shaft, and the outer surface of the pulley is in contact with the lower surface of the slide cylinder.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0027] 1. In the present invention, a protective component is provided, and an electric telescopic rod is used to drive the extrusion plate to extrude the pit wall. When the extrusion plate moves, it drives the fixed rack to move synchronously. Under the action of the transmission gear, the rotating rod is driven to rotate on the upper surface of the support plate. When the rotating rod rotates, it drives the rotating disk to rotate synchronously, thereby driving the protrusion to rotate. At this time, the knocking rod moves back and forth inside the fixed frame under the action of the telescopic spring and the fixed ring, so that one end of the knocking rod intermittently knocks the protective plate, and the knocked protective plate vibrates. With the cooperation of the extrusion plate, the soil on the pit wall is made more compact. In the process of foundation pit support, extrusion and knocking can make the soil on the pit wall more compact, improve the fixation of the soil on the pit wall, further ensure the stability of the foundation pit support device, and improve the safety of the foundation pit support device. When the foundation pit support device is collected, the knocking vibration can shake off the soil stuck on the protective plate and the extrusion plate, automatically clean the foundation pit support device, improve the cleanliness of the foundation pit support device, and thus improve the durability of the foundation pit support device.

[0028] 2. In the present invention, an adjusting component is provided, and according to the inclination of the pit wall of the foundation pit, the self-locking motor in the dust cover drives the threaded column to rotate. Under the action of the thread, the threaded sleeve moves on the outer surface of the threaded column. At this time, the mounting clamp drives one end of the connecting rod to move, and the other end of the connecting rod drives the protective plate to rotate in the mounting groove through the connecting clamp. When the outer surface of the protective plate contacts the pit wall of the foundation pit, the threaded column stops rotating. The foundation pit support device of the present invention has a simple structure and is convenient for rapid adjustment according to the conditions of the foundation pit. On the one hand, it reflects the convenience of construction of the foundation pit support device, and on the other hand, it improves the scope of use of the foundation pit support device.

[0029] 3. In the present invention, a stabilizing component is provided. Since a part of the positioning cone is located below the base plate, the device is placed in the base pit when support is required. At this time, the positioning cone will be inserted into the soil in the base pit, thereby fixing the base plate. During the tilting process of the protective plate, the slide will be driven by the fixing clamp to slide on the outer surface of the limit rod. At this time, the slide will drive the extrusion bevel block to move synchronously. With the movement of the extrusion bevel block, the fixed rod will drive the movable frame to move toward the base plate under the action of the pulley. At this time, the movable frame drives the positioning cone to move deeper into the soil, and automatically moves into the soil during the adjustment of the base pit support device, ensuring that the base pit support device is not prone to cheapness during adjustment and use, improving the stability of the base pit support device during use, and ensuring the support effect of the base pit support device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of an adjustable foundation pit supporting device.

[0031] Figure 2It is a schematic diagram of the three-dimensional structure of a first slide rail and a second slide rail in an adjustable foundation pit supporting device.

[0032] Figure 3 It is a schematic diagram of the three-dimensional structure of a GRG plate in an adjustable foundation pit support device.

[0033] Figure 4 It is a schematic diagram of the enlarged structure of point A in an adjustable foundation pit support device.

[0034] Figure 5 A side view of a GRG plate in an adjustable foundation pit support device.

[0035] Figure 6 The present invention is a schematic diagram of the exploded structure of a slide rail assembly in an adjustable foundation pit support device.

[0036] Figure 7 It is a schematic diagram of the three-dimensional structure of an extension component in an adjustable foundation pit support device.

[0037] Legend:

[0038] 1. Bottom plate; 2. Protection assembly; 21. Protection plate; 22. Electric telescopic rod; 23. Extrusion plate; 24. Support plate; 25. Rotating rod; 26. Transmission gear; 27. Fixed rack; 28. Rotating disk; 29. ​​Bump; 210. Fixed frame; 211. Telescopic spring; 212. Fixed ring; 213. Knocking rod; 3. Adjustment assembly; 31. Dust cover; 32. Threaded column; 33. Threaded sleeve; 34. Mounting clamp; 35. Connecting rod; 36. Connecting clamp; 4. Mounting groove; 5. Stabilizing assembly; 51. Limiting rod; 52. Slide; 53. Extrusion bevel block; 54. Fixed rod; 55. Fixed clamp; 56. Movable frame; 57. Connecting spring; 58. Positioning cone; 59. Pulley. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] See also Figure 1-Figure 7 The present invention provides a technical solution: an adjustable foundation pit support device, comprising a bottom plate 1, the side walls of the bottom plate 1 are all provided with mounting grooves 4, the inner wall of the mounting groove 4 is provided with a protection component 2, and the upper surface of the bottom plate 1 is provided with an adjustment component 3 and a stabilization component 5;

[0041] The protection assembly 2 includes four protection plates 21, and the two side walls of the four protection plates 21 are rotatably connected to the two side inner walls of the four mounting grooves 4 through rotating shafts. An electric telescopic rod 22 is fixedly installed on the side wall of the protection plate 21, and a groove is provided on the other side wall of the protection plate 21. One end of the electric telescopic rod 22 extends into the groove and is fixedly installed with an extrusion plate 23. The extrusion plate 23 is adapted to the size of the groove. A fixed rack 27 is fixedly installed on the side wall of the extrusion plate 23, and one end of the fixed rack 27 extends to the outside of the side wall of the protection plate 21. A support plate 24 is fixedly installed on the side wall of the protection plate 21, and a rotating rod 25 is fixedly installed on the upper surface of the support plate 24. A transmission gear is fixedly installed on the outer surface of the rotating rod 25 Wheel 26, the transmission gear 26 is meshed and connected with the fixed rack 27, a rotating disk 28 is fixedly installed on the upper surface of the rotating rod 25, a protrusion 29 is fixedly installed on the outer surface of the rotating disk 28, a fixing frame 210 is fixedly installed on the side wall of the protective plate 21, a telescopic spring 211 is fixedly installed on the side wall of the fixing frame 210, a fixing ring 212 is fixedly installed on one end of the telescopic spring 211, a knocking rod 213 is fixedly installed on the inner wall of the fixing ring 212, one end of the knocking rod 213 is fitted with the outer surface of the rotating disk 28, the other end of the knocking rod 213 passes through the interior of the telescopic spring 211 and extends to the outside of the other side wall of the fixing frame 210, and the other end of the knocking rod 213 contacts the side wall of the protective plate 21.

[0042] The specific implementation example is as follows: the extrusion plate 23 is driven by the electric telescopic rod 22 to extrude the pit wall. When the extrusion plate 23 moves, it will drive the fixed rack 27 to move synchronously. Under the action of the transmission gear 26, the rotating rod 25 is driven to rotate on the upper surface of the support plate 24. When the rotating rod 25 rotates, it will drive the rotating disk 28 to rotate synchronously, thereby driving the protrusion 29 to rotate. At this time, the knocking rod 213 moves back and forth inside the fixed frame 210 under the action of the telescopic spring 211 and the fixed ring 212, so that one end of the knocking rod 213 intermittently knocks the protective plate 21, and the knocked protective plate 21 will vibrate. With the cooperation of the extrusion plate 23, the soil on the pit wall is made more compact.

[0043] The adjustment assembly 3 includes a dust cover 31, the lower surface of the dust cover 31 is fixedly connected to the upper surface of the base plate 1, a self-locking motor is fixedly installed on the inner wall of the dust cover 31, a threaded column 32 is fixedly installed on the output end of the self-locking motor, one end of the threaded column 32 extends to the outside of the upper surface of the dust cover 31, a threaded sleeve 33 is threadedly installed on the outer surface of the threaded column 32, four mounting clips 34 are fixedly installed on the outer surface of the threaded sleeve 33, a connecting rod 35 is rotatably installed on the inner wall of the mounting clip 34 via a rotating shaft, a connecting clip 36 is rotatably installed on one end of the connecting rod 35 via a rotating shaft, and the side wall of the connecting clip 36 is fixedly connected to the side wall of the protective plate 21.

[0044] The specific implementation method is as follows: according to the inclination of the pit wall of the foundation pit, the self-locking motor in the dust cover 31 drives the threaded column 32 to rotate, and the threaded sleeve 33 moves on the outer surface of the threaded column 32 under the action of the thread. At this time, the mounting clamp 34 drives one end of the connecting rod 35 to move, and the other end of the connecting rod 35 drives the protective plate 21 to rotate in the mounting groove 4 through the connecting clamp 36. When the outer surface of the protective plate 21 contacts the pit wall of the foundation pit, the threaded column 32 stops rotating.

[0045] The stabilizing assembly 5 includes four limit rods 51 and a movable frame 56, one end of the four limit rods 51 are fixedly connected to the four side walls of the dust cover 31 respectively, a slide 52 is slidably installed on the outer surface of the limit rod 51, one end of the slide 52 is rotatably installed with a fixing clamp 55, the side wall of the fixing clamp 55 is fixedly connected to the side wall of the protective plate 21, the lower surface of the slide 52 is fixedly installed with an extrusion inclined block 53, a plurality of connecting springs 57 are fixedly installed on the lower surface of the movable frame 56, one end of the connecting spring 57 is fixedly connected to the upper surface of the bottom plate 1, four positioning cones 58 are fixedly installed on the lower surface of the movable frame 56, one end of the positioning cone 58 extends to the outside of the lower surface of the bottom plate 1, a fixing rod 54 is fixedly installed on the inner surface of the movable frame 56, one end of the fixing rod 54 is provided with a notch, a pulley 59 is rotatably installed on the inner wall of the notch through a rotating shaft, and the outer surface of the pulley 59 fits with the lower surface of the slide 52.

[0046] The specific implementation method is as follows: since a part of the positioning cone 58 is located below the base plate 1, the device is placed in the base pit when support is required. At this time, the positioning cone 58 will be inserted into the soil in the base pit, thereby fixing the base plate 1. During the tilting process of the protective plate 21, the slide 52 will be driven by the fixing clamp 55 to slide on the outer surface of the limiting rod 51. At this time, the slide 52 will drive the extrusion inclined block 53 to move synchronously. With the movement of the extrusion inclined block 53, the fixed rod 54 will drive the movable frame 56 to move toward the direction of the base plate 1 under the action of the pulley 59. At this time, the movable frame 56 drives the positioning cone 58 to move deep into the soil.

[0047] Working principle: Since a part of the positioning cone 58 is located below the base plate 1, the device is placed in the base pit when the foundation pit needs support. At this time, the positioning cone 58 will be inserted into the soil in the foundation pit, thereby fixing the base plate 1. Then, according to the inclination of the pit wall, the self-locking motor in the dust cover 31 drives the threaded column 32 to rotate. Under the action of the thread, the threaded sleeve 33 moves on the outer surface of the threaded column 32. At this time, the mounting clamp 34 drives one end of the connecting rod 35 to move, and the other end of the connecting rod 35 drives the protective plate 21 to rotate in the mounting groove 4 through the connecting clamp 36. When the outer surface of the protective plate 21 contacts the pit wall of the foundation pit, the threaded column 32 stops rotating. During the tilting process of the protective plate 21, the slide cylinder 52 will be driven to slide on the outer surface of the limit rod 51 through the fixing clamp 55. At this time, the slide cylinder 52 will drive the extrusion inclined block 53 to move synchronously. As the extrusion inclined block 53 moves The movable frame 56 moves, and the fixed rod 54 drives the movable frame 56 to move toward the bottom plate 1 under the action of the pulley 59. At this time, the movable frame 56 drives the positioning cone 58 to move deep into the soil, and drives the extrusion plate 23 to squeeze the pit wall through the electric telescopic rod 22. When the extrusion plate 23 moves, it drives the fixed rack 27 to move synchronously, and drives the rotating rod 25 to rotate on the upper surface of the support plate 24 under the action of the transmission gear 26. When the rotating rod 25 rotates, it drives the rotating disk 28 to rotate synchronously, thereby driving the protrusion 29 to rotate. At this time, the knocking rod 213 moves back and forth inside the fixed frame 210 under the action of the telescopic spring 211 and the fixed ring 212, so that one end of the knocking rod 213 intermittently knocks the protective plate 21, and the knocked protective plate 21 vibrates. With the cooperation of the extrusion plate 23, the soil on the pit wall is made more compact.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An adjustable foundation pit support device, comprising a bottom plate (1), characterized in that: The bottom plate (1) is provided with mounting grooves (4) on all four side walls, the inner wall of the mounting groove (4) is provided with a protection component (2), and the upper surface of the bottom plate (1) is provided with an adjustment component (3) and a stabilization component (5); The protection assembly (2) comprises four protection plates (21), and the two side walls of the four protection plates (21) are rotatably connected to the two side inner walls of four mounting grooves (4) via rotating shafts, and an electric telescopic rod (22) is fixedly mounted on the side wall of the protection plate (21), and a groove is provided on the other side wall of the protection plate (21), and one end of the electric telescopic rod (22) extends into the groove and is fixedly mounted with an extrusion plate (23), and the extrusion plate (23) is adapted to the size of the groove.

2. The adjustable foundation pit support device according to claim 1, characterized in that: A fixed rack (27) is fixedly mounted on the side wall of the extrusion plate (23), one end of the fixed rack (27) extends outside the side wall of the protective plate (21), a support plate (24) is fixedly mounted on the side wall of the protective plate (21), a rotating rod (25) is fixedly mounted on the upper surface of the support plate (24), a transmission gear (26) is fixedly mounted on the outer surface of the rotating rod (25), and the transmission gear (26) is meshingly connected with the fixed rack (27).

3. The adjustable foundation pit support device according to claim 2, characterized in that: A rotating disk (28) is fixedly mounted on the upper surface of the rotating rod (25), a protrusion (29) is fixedly mounted on the outer surface of the rotating disk (28), a fixing frame (210) is fixedly mounted on the side wall of the protective plate (21), a telescopic spring (211) is fixedly mounted on the side wall of the fixing frame (210), and a fixing ring (212) is fixedly mounted on one end of the telescopic spring (211).

4. The adjustable foundation pit support device according to claim 3, characterized in that: A knocking rod (213) is fixedly mounted on the inner wall of the fixing ring (212), one end of the knocking rod (213) is in contact with the outer surface of the rotating disk (28), the other end of the knocking rod (213) passes through the interior of the telescopic spring (211) and extends to the outside of the other side wall of the fixing frame (210), and the other end of the knocking rod (213) is in contact with the side wall of the protective plate (21).

5. The adjustable foundation pit support device according to claim 4, characterized in that: The adjustment assembly (3) comprises a dust cover (31), the lower surface of the dust cover (31) is fixedly connected to the upper surface of the base plate (1), a self-locking motor is fixedly mounted on the inner wall of the dust cover (31), a threaded column (32) is fixedly mounted on the output end of the self-locking motor, and one end of the threaded column (32) extends outside the upper surface of the dust cover (31).

6. The adjustable foundation pit support device according to claim 5, characterized in that: A threaded sleeve (33) is threadedly mounted on the outer surface of the threaded column (32), and four mounting clamps (34) are fixedly mounted on the outer surface of the threaded sleeve (33). A connecting rod (35) is rotatably mounted on the inner wall of the mounting clamp (34) via a rotating shaft, and a connecting clamp (36) is rotatably mounted on one end of the connecting rod (35) via a rotating shaft, and the side wall of the connecting clamp (36) is fixedly connected to the side wall of the protective plate (21).

7. The adjustable foundation pit support device according to claim 6, characterized in that: The stabilizing assembly (5) comprises four limiting rods (51) and a movable frame (56), one end of the four limiting rods (51) are respectively fixedly connected to the surrounding side walls of the dust cover (31), and a slide cylinder (52) is slidably mounted on the outer surface of the limiting rod (51).

8. The adjustable foundation pit support device according to claim 7, characterized in that: A fixing clamp (55) is rotatably mounted on one end of the slide cylinder (52) via a rotating shaft, a side wall of the fixing clamp (55) is fixedly connected to a side wall of the protective plate (21), and an extrusion bevel block (53) is fixedly mounted on the lower surface of the slide cylinder (52).

9. The adjustable foundation pit support device according to claim 8, characterized in that: A plurality of connecting springs (57) are fixedly mounted on the lower surface of the movable frame (56), one end of each connecting spring (57) is fixedly connected to the upper surface of the bottom plate (1), and four positioning cones (58) are fixedly mounted on the lower surface of the movable frame (56), one end of each positioning cone (58) extends outside the lower surface of the bottom plate (1).

10. The adjustable foundation pit support device according to claim 9, characterized in that: A fixing rod (54) is fixedly mounted on the inner surface of the movable frame (56), one end of the fixing rod (54) is provided with a notch, a pulley (59) is rotatably mounted on the inner wall of the notch via a rotating shaft, and the outer surface of the pulley (59) is in contact with the lower surface of the slide cylinder (52).

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