Hydraulic ring geological crack measuring device

Abstract

The utility model discloses a hydraulic ring geological crack measuring device, which comprises a mounting box with an opening at the bottom, two L-shaped supporting legs are magnetically inserted into two sides of the bottom of the mounting box, a storage hole is formed in the top of the right side of the mounting box, and magnet blocks are fixedly connected to two sides of the top of the mounting box. The storage holes and the magnet blocks are matched with the four L-shaped supporting legs, the storage holes are used for storing the four L-shaped supporting legs, the magnet blocks are used for adsorbing and fixing the corresponding L-shaped supporting legs, the top of the mounting box is fixedly connected with a control reminding mechanism, and the control reminding mechanism is used for reminding personnel. According to the utility model, through the arrangement of a series of structures, the moving position of the measuring rod can be clearly and accurately known through a reminding mode of the reminding lamp during measurement, personnel do not need to observe the position of the measuring rod, the measurement work is not influenced, the total volume of the whole device can be reduced after use, and the carrying and the transportation are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic ring geological crack measurement, in particular to a hydraulic ring geological crack measurement device. Background Art

[0002] When cracks occur, it is necessary to measure the cracks to facilitate subsequent repairs. The existing hydraulic ring geological crack measuring device is complicated to operate during use, and is not convenient for quickly adjusting the measurement according to the crack width, which increases the labor intensity of the staff and thus reduces the work efficiency of the staff. For this purpose, application number: 202120464368.9 discloses a hydraulic ring geological crack measuring device, including a support base, a movable roller, a brake plate, a connecting vertical plate, a reinforcement vertical plate, a lifting hydraulic rod and a mobile measuring device. The mobile measuring device includes a support vertical plate, a drive motor, a transmission screw, a screw support, a support top plate, a movable slide, a movable slider, a movable connecting plate, a movable measuring plate, an elongation measuring plate and a measuring scale; the device effectively solves the problems of low automation level, complex operation and low work efficiency of the hydraulic ring geological crack measuring device on the market, and achieves the purpose of high automation level, simple operation and high work efficiency of the hydraulic ring geological crack measuring device, and is a very practical hydraulic ring geological crack measuring device.

[0003] The above patent discloses a hydraulic ring geological fracture measuring device, which can realize effective measurement of fractures, but it still has the following shortcomings when used: 1. The overall volume of the entire device is large, which is inconvenient to carry and transport after use; 2. When the measuring plate is inserted into the fracture for measurement, one side of the measuring plate needs to be in contact with one side of the inner wall of the fracture to achieve accurate measurement. When the measuring plate moves to contact the inner wall of the fracture after insertion, it cannot clearly remind personnel, and personnel need to observe it themselves. When the fracture is deep, it is difficult for personnel to observe, and thus it is impossible to accurately judge the position of the moving measuring plate, which affects subsequent measurement operations. Based on the above situation, improvements are made, and therefore the present application proposes a hydraulic ring geological fracture measuring device. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a hydraulic ring geological crack measuring device.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A hydraulic ring geological crack measuring device includes a mounting box with an opening at the bottom, two L-shaped support legs are magnetically inserted on both sides of the bottom of the mounting box, a storage hole is provided on the top right side of the mounting box, and magnet blocks are fixedly connected to both sides of the top of the mounting box, the storage holes and the magnet blocks are matched with the four L-shaped support legs, the storage holes are used to store the four L-shaped support legs, and the magnet blocks are used to adsorb and fix the corresponding L-shaped support legs, a control reminder mechanism is fixedly connected to the top of the mounting box, and the control reminder mechanism is used to remind personnel, an electric slide rail is fixedly connected to the top inner wall of the mounting box, and a rotating Rotation adjustment locking mechanism, the bottom of the rotation adjustment locking mechanism is fixedly connected to the multi-stage electric telescopic rod, the rotation adjustment locking mechanism can rotationally adjust the multi-stage electric telescopic rod, the bottom end of the output shaft of the multi-stage electric telescopic rod is fixedly connected to a measuring rod, the front side of the installation box is provided with a scale line, the two measuring rods are matched with the scale line on the side away from each other, the measuring rods and the scale line are matched to measure the width of the crack, the two measuring rods are embedded and fixed with a pressure detection mechanism on the side close to each other, the pressure detection mechanism and the electric slide rail are electrically connected to the control reminder mechanism, the pressure detection mechanism is used to detect the extrusion force when the measuring rod moves, and transmit the detected extrusion force to the pressure detection mechanism.

[0007] Preferably, the control reminder mechanism includes two reminder lights and a controller fixedly connected to the top of the installation box. The two reminder lights and the electric slide rail are electrically connected to the controller. The reminder lights are used to remind personnel.

[0008] The cam is secured to the bottom of the sliding rail by a spring which is secured to the left of the locking cam and secured to the bottom of the sliding rail by a spring which is secured to the left of the locking cam.

[0009] Preferably, the pressure detection mechanism includes a second rectangular box embedded and fixed on one side of the measuring rod, and the sides of the two second rectangular boxes away from each other are set as openings, and a pressure sensor is fixedly connected to the inner wall of the second rectangular box away from its opening. The sliding sleeve in the second rectangular box is provided with an extrusion block, and the sides of the two extrusion blocks away from each other extend to the outside of the corresponding second rectangular box respectively. A second spring is fixedly connected between the sides of the two extrusion blocks close to each other and the sides of the two pressure sensors away from each other. The pressure sensor detects the extrusion force of the extrusion block through the corresponding second spring. The pressure sensor is electrically connected to the controller, and the extrusion force detected by the pressure sensor is transmitted to the controller. The principle is the existing technology and will not be elaborated here.

[0010] Preferably, two rectangular slots are provided on both sides of the bottom of the installation box, the inner walls of the rectangular slots are in movable contact with the outer sides of the corresponding L-shaped support legs, a third magnet is fixedly connected to the top inner wall of the rectangular slot, the L-shaped support legs are made of iron, the top of the L-shaped support legs are adsorbed with the bottom of the corresponding third magnet, and the L-shaped support legs are fixed by utilizing the adsorption force between the L-shaped support legs and the corresponding third magnet.

[0011] Preferably, a U-shaped handle is fixedly connected to the top of the installation box, and the entire device can be carried by the U-shaped handle.

[0012] Preferably, a circular shaft is fixedly connected between the front inner wall and the rear inner wall of the first rectangular box, a circular hole is opened on the front side of the rotating block, a bearing is fixedly sleeved in the circular hole, the inner side of the inner ring of the bearing is fixedly connected to the outer side of the corresponding circular shaft, the bearing and the circular shaft cooperate to provide a rotatable installation for the rotating block, a rectangular through-hole is opened on the left inner wall of the first rectangular box, the outer side of the L-shaped clamping rod is in movably contact with the corresponding inner wall of the rectangular through-hole, and the rectangular through-hole is used for the corresponding L-shaped clamping rod to pass through.

[0013] Compared with the existing technology, the beneficial effects of the utility model are:

[0014] 1. By controlling the reminder mechanism and the pressure detection mechanism, when the measuring rod moves to contact the inner wall of the crack, the reminder light will light up to remind the personnel, so that the personnel can clearly and accurately know the position of the measuring rod. The personnel do not need to observe the position of the measuring rod by themselves, which does not affect the measurement work.

[0015] 2. Through the cooperation of the L-shaped support legs, storage holes, rotation adjustment locking mechanism and magnet blocks, the L-shaped support legs can be stored and fixed after use, and the multi-stage electric telescopic rod and measuring rod can be rotated to a horizontal state and fixed, so that the total volume of the entire device is reduced and easy to carry and transport;

[0016] Through the arrangement of a series of structures, the utility model can clearly and accurately know the moving position of the measuring rod by means of a prompt light during measurement, eliminating the need for personnel to observe the position of the measuring rod themselves, which does not affect the progress of the measurement work, and can reduce the total volume of the entire device after use, making it convenient to carry and transport. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of a hydraulic ring geological fracture measurement device proposed by the utility model;

[0018] Figure 2 This is a schematic diagram of the main cross-sectional structure of a hydraulic ring geological fracture measurement device proposed by the utility model;

[0019] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of part A;

[0020] Figure 4 for Figure 2 Schematic diagram of the enlarged structure of part B;

[0021] Figure 5 This is a schematic cross-sectional structural diagram of a hydraulic ring geological fracture measuring device proposed by the present invention, in a state where the total volume of the entire device is reduced.

[0022] In the figure: 100, installation box; 1, storage hole; 2, magnet block; 3, L-shaped support leg; 4, rectangular slot; 5, electric slide rail; 6, prompt light; 7, controller; 8, measuring rod; 9, multi-stage electric telescopic rod; 10, second rectangular box; 11, extrusion block; 12, pressure sensor; 13, second spring; 14, first rectangular box; 15, first spring; 16, rotating block; 17, slot; 18, L-shaped clamping rod. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Reference Figure 1-5The yoke 100 is provided with a U-shaped handle on the top of the yoke 100, and the yoke 100 is provided with a U-shaped handle on the top of the yoke 100. The yoke 100 is provided with a U-shaped handle on the top of the yoke 100, and the yoke 100 is provided with a U-shaped handle on the top of the yoke 100. The yoke 100 is provided with a U-shaped handle on the top of the yoke 100, and the yoke 100 is provided with a U-shaped handle on the top of the yoke 100. The yoke 100 is provided with a U-shaped handle on the top of the yoke 100, and the yoke 100 is provided with a U-shaped handle on the top of the yoke 100.

[0025] The top of the installation box 100 is fixedly connected to a control reminder mechanism, which includes two warning lights 6 and a controller 7 fixedly connected to the top of the installation box 100. An electric slide 5 is fixedly connected to the top inner wall of the installation box 100. The two warning lights 6 and the electric slide 5 are electrically connected to the controller 7. The warning lights 6 are used to remind personnel;

[0026] A rotation adjustment locking mechanism is fixedly installed between the bottom of the sliding end of the electric slide rail 5 and the front inner wall and the rear inner wall of the installation box 100. The rotation adjustment locking mechanism includes a first rectangular box 14 with openings on the right and the bottom. The first rectangular box 14 on the left is fixedly installed with the front inner wall and the rear inner wall of the installation box 100, wherein the front and rear sides of the first rectangular box 14 on the left are fixedly connected with connecting rods, and the ends of the two connecting rods away from each other are fixedly connected to the front inner wall and the rear inner wall of the installation box 100 respectively. A connecting rod supports and fixes the first rectangular box 14 on the left side, and the first rectangular box 14 on the right side is fixedly installed at the bottom of the sliding end of the electric slide rail 5. A rotating block 16 is rotatably installed between the front inner wall and the rear inner wall of the first rectangular box 14, wherein a circular shaft is fixedly connected between the front inner wall and the rear inner wall of the first rectangular box 14, and a circular hole is opened on the front side of the rotating block 16. A bearing is fixedly sleeved in the circular hole, and the inner side of the inner ring of the bearing is fixedly connected to the outer side of the corresponding circular shaft. The bearing and the circular shaft cooperate to provide a rotating installation for the rotating block 16. The bottom of the rotating block 16 is fixedly connected to the multi-stage electric telescopic rod 9, and a slot 17 is provided on the top and left side of the rotating block 16. The slot 17 on the left side is provided with an L-shaped card rod 18, and the L-shaped card rod 18 cooperates with the slot 17 to fix the rotating block 16. The first rectangular box 14 is slidably sleeved on the corresponding L-shaped card rod 18, wherein a rectangular perforation is provided on the left inner wall of the first rectangular box 14, and the outer side of the L-shaped card rod 18 is in active contact with the inner wall of the corresponding rectangular perforation, and the rectangular perforation is used for the corresponding L shaped card rod 18 passes through, and a mounting block is fixedly connected to the top inner wall of the L-shaped card rod 18. A first spring 15 is fixedly connected between the left side of the mounting block and the left inner wall of the corresponding first rectangular box 14. The mounting block is used to support the corresponding first spring 15. A first magnet is fixedly connected to the top right side of the first rectangular box 14, and a second magnet is fixedly connected to the top right side of the multi-stage electric telescopic rod 9. The second magnet cooperates with the corresponding first magnet, and the adsorption force of the first magnet and the second magnet can be used to further fix the multi-stage electric telescopic rod 9;

[0027] The bottom end of the output shaft of the multi-stage electric telescopic rod 9 is fixedly connected to the measuring rod 8, and the front side of the mounting box 100 is provided with a scale line. The sides of the two measuring rods 8 away from each other are matched with the scale line. The measuring rods 8 and the scale line are matched to measure the width of the crack. The sides of the two measuring rods 8 close to each other are embedded and fixed with a pressure detection mechanism. The pressure detection mechanism includes a second rectangular box 10 embedded and fixed on one side of the measuring rod 8, wherein the sides of the two measuring rods 8 close to each other are provided with an embedding hole for fixedly installing the corresponding second rectangular box 10, and the sides of the two second rectangular boxes 10 away from each other are set as openings. A pressure sensor 12 is fixedly connected to the inner wall of the second rectangular box 10 away from its opening, and an extrusion block 11 is provided with a sliding sleeve in the second rectangular box 10, and the two extrusion blocks 11 are mutually The distant side extends to the outside of the corresponding second rectangular box 10, and the second spring 13 is fixedly connected between the side of the two extrusion blocks 11 that are close to each other and the side of the two pressure sensors 12 that are away from each other. The pressure sensor 12 detects the extrusion force of the extrusion block 11 through the corresponding second spring 13. The pressure sensor 12 is electrically connected to the controller 7, and the extrusion force detected by the pressure sensor 12 is transmitted to the controller 7. Its principle is the existing technology and will not be elaborated here. The utility model can clearly and accurately know the moving position of the measuring rod 8 through the reminder of the prompt light 6 during measurement through a series of structural settings. There is no need for personnel to observe the position of the measuring rod 8 by themselves, which does not affect the progress of the measurement work, and can reduce the total volume of the entire device after use, making it convenient to carry and transport.

[0028] Working principle: When in use, the four L-shaped support legs 3 support the entire device. The pressure value for turning on the prompt light 6 and the pressure value for closing the electric slide 5 are set in advance through the controller 7. When the extrusion block 11 moves to be flush with one side of the corresponding measuring rod 8, the extrusion block 11 exerts an extrusion force on the pressure sensor 12 through the corresponding second spring 13, which is the pressure value for the controller 7 to control the turning on of the prompt light 6 and the closing of the electric slide 5. The entire device can be moved to the crack through the U-shaped handle. After moving to the crack, the two multi-stage electric telescopic rods 9 are opened in the positive direction. The output shaft of the multi-stage electric telescopic rod 9 drives the corresponding measuring rod 8 to be inserted into the crack to be measured. When it moves to the appropriate depth, the multi-stage electric telescopic rod 9 can be stopped. The electric telescopic rod 9 then moves the entire device to the left, causing the measuring rod 8 on the left to move to the left. When the measuring rod 8 on the left drives the extrusion block 11 to move to the left inner wall of the crack through the corresponding second rectangular box 10, the extrusion block 11 is restricted from continuing to move. At this time, the measuring rod 8 that continues to move drives the corresponding second rectangular box 10 to continue to move to the left. The second rectangular box 10 drives the second spring 13 to squeeze the extrusion block 11 through the corresponding pressure sensor 12, so that the second spring 13 is compressed. The pressure sensor 12 detects its extrusion force and transmits the detected pressure value to the controller 7. When the left inner wall of the measuring rod 8 on the left contacts the inner wall of the crack, and the left side of the measuring rod 8 on the left contacts the extrusion block 11 When the left side of the crack is flush, the extrusion force is the set pressure value. At this time, the controller 7 controls the warning light 6 on the left to light up to remind the personnel, and the entire device can be stopped from moving to the left. Then the electric slide rail 5 can be opened in the forward direction. The sliding end of the electric slide rail 5 drives the measuring rod 8 on the right to move to the right through the first rectangular box 14 on the right and the multi-stage electric telescopic rod 9 on the right in turn. When the measuring rod 8 on the right drives the extrusion block 11 to move to the inner wall of the other side of the crack through the corresponding second rectangular box 10, the extrusion block 11 on the right is restricted from continuing to move. At this time, the second rectangular box 10 that continues to move drives the corresponding pressure sensor 12 and the second spring 13 to squeeze the extrusion block 11, and the pressure sensor 12 squeezes the second spring 13 The force is detected and transmitted to the controller 7. When the right side of the measuring rod 8 on the right side contacts the inner wall of the other side of the crack and the right side of the extrusion block 11, the set extrusion force is reached. At this time, the controller 7 controls the warning light 6 on the right side to light up and controls the electric slide rail 5 to close. When the measuring rod 8 contacts the inner wall of the crack, the personnel is reminded in a way that it is convenient for the personnel to clearly and accurately judge the position of the moving measuring rod 8. The personnel do not need to observe the position of the measuring rod 8 by themselves, which does not affect the progress of the measurement work. After the warning lights 6 are all on, the personnel can start the two multi-stage electric telescopic rods 9 in the reverse direction, so that the measuring rod 8 moves vertically out of the crack. At this time, the position of the scale line corresponding to the side where the two measuring rods 8 are away from each other can be observed, and the width of the crack can be directly read.

[0029] After the measurement, the four L-shaped support legs 3 can be pulled downwards to separate the L-shaped support legs 3 from the corresponding third magnets. Then, the four L-shaped support legs 3 can be inserted into the storage holes 1. When the L-shaped support legs 3 move to be adsorbed by the corresponding magnet blocks 2, the L-shaped support legs 3 can be fixed. Then, the corresponding L-shaped clamping rod 18 can be pulled to the left. The L-shaped clamping rod 18 drives the corresponding mounting block to compress the first spring 15. When the L-shaped clamping rod 18 is removed from the corresponding clamping groove 17, the fixation of the rotating block 16 can be released. At this time, the measuring rod 8 can be rotated upwards to drive the corresponding multi-stage electric telescopic rod 9 to rotate upwards to a horizontal position. The multi-stage electric telescopic rod 9 drives the corresponding second magnet to move When the multi-stage electric telescopic rod 9 is attracted by the first magnet, it also drives the corresponding rotating block 16 to rotate. When the other card slot 17 of the rotating block 16 is aligned with the corresponding L-shaped card rod 18, the thrust on the L-shaped card rod 18 can be released. At this time, the elastic force of the first spring 15 in the compressed state drives the L-shaped card rod 18 to be inserted into the card slot 17 through the corresponding mounting block, thereby fixing the rotating block 16. At the same time, with the adsorption force of the first magnet and the second magnet, the multi-stage electric telescopic rod 9 and the measuring rod 8 are fixed. When the two multi-stage electric telescopic rods 9 and the measuring rod 8 are rotated to the horizontal, the total volume of the entire device is reduced, making it convenient for people to directly carry it by the U-shaped handle;

[0030] When used again in the future, the L-shaped supporting leg 3 can be pulled out and inserted into the corresponding rectangular slot 4 again, and the L-shaped clamping rod 18 can be pulled to the left again to release the fixation of the rotating block 16, and the measuring rod 8 and the multi-stage electric telescopic rod 9 can be rotated to vertical, and the pulling force on the L-shaped clamping rod 18 can be released, and the measuring rod 8 and the multi-stage electric telescopic rod 9 can be fixed again, and the measuring operation can be continued.

[0031] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hydraulic ring geological crack measuring device, comprising an installation box (100) with an opening at the bottom, characterized in that: Two L-shaped support legs (3) are magnetically inserted on both sides of the bottom of the installation box (100), a storage hole (1) is opened on the top right side of the installation box (100), and magnet blocks (2) are fixedly connected to both sides of the top of the installation box (100), and the storage holes (1) and the magnet blocks (2) are matched with the four L-shaped support legs (3). A control reminder mechanism is fixedly connected to the top of the installation box (100), and an electric slide rail (5) is fixedly connected to the inner wall of the top of the installation box (100), and the bottom of the sliding end of the electric slide rail (5) is in contact with the installation box (10 A rotation adjustment locking mechanism is fixedly installed between the front inner wall and the rear inner wall of the device (0), the bottom of the rotation adjustment locking mechanism is fixedly connected to a multi-stage electric telescopic rod (9), the bottom end of the output shaft of the multi-stage electric telescopic rod (9) is fixedly connected to a measuring rod (8), the front side of the installation box (100) is provided with a scale line, the sides of the two measuring rods (8) away from each other are matched with the scale line, the sides of the two measuring rods (8) close to each other are embedded and fixed with a pressure detection mechanism, and the pressure detection mechanism and the electric slide rail (5) are electrically connected to the control reminder mechanism.

2. A hydraulic ring geological fracture measuring device according to claim 1, characterized in that: The control reminder mechanism comprises two reminder lights (6) and a controller (7) fixedly connected to the top of the installation box (100); the two reminder lights (6) and the electric slide rail (5) are electrically connected to the controller (7).

3. A hydraulic ring geological fracture measuring device according to claim 1, characterized in that: The rotation adjustment locking mechanism comprises a first rectangular box (14) with openings on the right and bottom, the first rectangular box (14) on the left is fixedly mounted on the front inner wall and the rear inner wall of the mounting box (100), the first rectangular box (14) on the right is fixedly mounted on the bottom of the sliding end of the electric slide rail (5), a rotating block (16) is rotatably mounted between the front inner wall and the rear inner wall of the first rectangular box (14), the bottom of the rotating block (16) is fixedly connected to the top of the corresponding multi-stage electric telescopic rod (9), and the top and left sides of the rotating block (16) are both opened. A card slot (17) is provided, wherein an L-shaped card rod (18) is movably mounted in the card slot (17) on the left side, and the first rectangular box (14) is slidably sleeved on the corresponding L-shaped card rod (18). A mounting block is fixedly connected to the inner wall of the top of the L-shaped card rod (18), and a first spring (15) is fixedly connected between the left side of the mounting block and the inner wall of the left side of the corresponding first rectangular box (14). A first magnet is fixedly connected to the top right side of the first rectangular box (14), and a second magnet is fixedly connected to the top right side of the multi-stage electric telescopic rod (9), and the second magnet cooperates with the corresponding first magnet.

4. A hydraulic ring geological fracture measuring device according to claim 2, characterized in that: The pressure detection mechanism comprises a second rectangular box (10) embedded and fixed on one side of the measuring rod (8); the sides of the two second rectangular boxes (10) away from each other are both set as openings; a pressure sensor (12) is fixedly connected to the inner wall of the second rectangular box (10) away from the opening; an extrusion block (11) is slidingly sleeved inside the second rectangular box (10); the sides of the two extrusion blocks (11) away from each other respectively extend to the outside of the corresponding second rectangular box (10); a second spring (13) is fixedly connected between the sides of the two extrusion blocks (11) close to each other and the sides of the two pressure sensors (12) away from each other; and the pressure sensor (12) is electrically connected to the controller (7).

5. The hydraulic ring geological fracture measuring device according to claim 1, characterized in that: Two rectangular slots (4) are provided on both sides of the bottom of the installation box (100), the inner walls of the rectangular slots (4) are in movable contact with the outer sides of the corresponding L-shaped support legs (3), a third magnet is fixedly connected to the top inner wall of the rectangular slots (4), the L-shaped support legs (3) are made of iron, and the top of the L-shaped support legs (3) is attracted to the bottom of the corresponding third magnet.

6. The hydraulic ring geological fracture measuring device according to claim 1, characterized in that: A U-shaped handle is fixedly connected to the top of the installation box (100).

7. The hydraulic ring geological fracture measuring device according to claim 3, characterized in that: A circular shaft is fixedly connected between the front inner wall and the rear inner wall of the first rectangular box (14); a circular hole is opened on the front side of the rotating block (16); a bearing is fixedly sleeved in the circular hole; the inner side of the inner ring of the bearing is fixedly connected to the outer side of the corresponding circular shaft; a rectangular through hole is opened on the left inner wall of the first rectangular box (14); the outer side of the L-shaped clamping rod (18) is in movably contact with the inner wall of the corresponding rectangular through hole.

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