Equipment vehicle and equipment vehicle system

Abstract

The invention relates to an equipment vehicle and an equipment vehicle system, the equipment vehicle comprises an undercarriage, wheels, a first vehicle stopping assembly and a second vehicle stopping assembly, the first vehicle stopping assembly comprises a supporting part and a moving part, the supporting part is connected to the undercarriage, and the moving part is connected with the wheels and used for driving the wheels to move so that the supporting part can make contact with a track; the second car stopping assembly comprises at least two car stopping pieces and a power piece, the car stopping pieces are symmetrically arranged relative to the track, and the power piece is connected with the car stopping pieces and used for driving the car stopping pieces to move in the direction close to each other so as to clamp the track. According to the equipment car, the two car stopping assemblies are matched with each other, so that the equipment car can be better fixed, even if one car stopping assembly breaks down, the equipment car cannot move, when the equipment car needs to continue to move, the two car stopping assemblies can be automatically opened, direct operation of workers is not needed, and the working efficiency is improved. Therefore, the moving efficiency of the equipment vehicle can be improved, and the safety of workers is guaranteed.

Description

Technical Field

[0001] The present disclosure relates to the technical field of underground mining, and in particular, to an equipment vehicle and an equipment vehicle system using the equipment vehicle. Background Art

[0002] In underground coal mining operations, equipment vehicles are used to carry necessary equipment such as mobile transformers and high-security switches. They are generally composed of 35-45 discs. In related technologies, equipment vehicles are generally fixed with special track clamps when in use. The track clamps are set on both sides of the wheels on each disc to prevent the disc from moving during use. When the equipment vehicle needs to be moved, the staff needs to manually remove all the car blockers before moving. Finally, after the installation is completed, all the track clamps need to be reinstalled. The whole process is time-consuming and labor-intensive, and there are certain safety risks during the movement. Summary of the invention

[0003] The object of the present disclosure is to provide an equipment vehicle that can be well fixed on a track and can be operated directly without work.

[0004] In order to achieve the above object, the present disclosure provides an equipment vehicle including a wheel base, on which wheels are arranged, including: The first wheel-blocking assembly comprises a supporting portion and a moving portion, wherein the supporting portion is connected to the wheel disc, and the moving portion is connected to the wheel to drive the wheel to move so that the supporting portion can contact the track; The second car-blocking assembly includes a car-blocking plate and a power member. At least two car-blocking plates are symmetrically arranged relative to the track. The power member is connected to the car-blocking plates and is used to drive the car-blocking plates to move in a direction approaching each other so as to clamp the track.

[0005] Optionally, the support portion includes support plates located on both radial sides of the wheel, and an anti-slip pad is provided on one side of the support plate in contact with the track.

[0006] Optionally, the moving part includes a moving seat, the wheel is rotatably connected to the moving seat, the support plate is located on both sides of the moving seat along the radial direction of the wheel, and a slide groove is provided on the side of the support plate facing the wheel, and sliders located in the slide groove are provided on both sides of the moving seat.

[0007] Optionally, a first sensing element is disposed at the bottom of the slide groove, and the first sensing element is used to sense the position of the sliding block.

[0008] Optionally, the moving part further comprises a moving cylinder, one end of which is fixedly connected to the undercarriage, and a driving end of which is connected to the moving seat for driving the moving seat to move.

[0009] Optionally, two symmetrically arranged vehicle blocks are provided with connecting parts and mating parts facing each other, and both the connecting parts and mating parts are provided with first connecting holes, and the two first connecting holes overlap, and a first connecting shaft is provided in the first connecting hole, and the power part is a power cylinder provided between the two vehicle blocks, one end of the power cylinder is fixed on one of the vehicle blocks, and the driving end is fixedly connected to the other vehicle block, so as to drive the two vehicle blocks to rotate in a direction approaching each other relative to the first connecting shaft.

[0010] Optionally, a groove body is provided at the clamping end of the vehicle blocking sheet, the shape of the groove body is adapted to the track, and an anti-slip pad is provided in the groove body.

[0011] Optionally, a second sensing element is further arranged between two symmetrically arranged vehicle blocking plates, and the second sensing element is used to sense the distance between the two vehicle blocking plates.

[0012] A second aspect of the present disclosure further provides an equipment vehicle system, comprising a plurality of equipment vehicle groups and a control component, wherein the equipment vehicle group comprises a plurality of equipment vehicles described in the above embodiments, adjacent equipment vehicles in the equipment vehicle group are connected by connecting rods, and adjacent equipment vehicle groups are connected by driving members.

[0013] Optionally, a first connector and a second connector are provided on the disc, and one end of the connecting rod and the driving member is provided with a second connecting hole that cooperates with the first connector and has an axis extending along the first direction, and the other end is provided with a second connecting shaft that cooperates with the second connector and has an axis arranged along the second direction, and the first direction and the second direction are perpendicular to each other.

[0014] Compared with the prior art, the advantages of the present invention are: the equipment vehicle of the present invention includes a disc and two vehicle-blocking assemblies, wherein the first vehicle-blocking assembly limits the movement of the equipment vehicle by making the wheels leave the track and then supporting the disc through the supporting part, and the second vehicle-blocking assembly clamps the track through two vehicle-blocking plates to limit the movement of the equipment vehicle, and the two groups of vehicle-blocking assemblies cooperate with each other to better fix the equipment vehicle, and even if one group of the vehicle-blocking assemblies fails, it will not cause the movement of the equipment vehicle, and when the equipment vehicle needs to continue to move, the two groups of vehicle-blocking assemblies can also be automatically opened without direct operation by the staff, thereby improving the efficiency of the equipment vehicle movement and ensuring the safety of the staff.

[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is an exploded view of a first vehicle blocking assembly in an equipment vehicle provided in an exemplary embodiment of the present disclosure; Figure 2 is a structural schematic diagram of a first vehicle blocking assembly in an equipment vehicle provided in an exemplary embodiment of the present disclosure; Figure 3 is a structural schematic diagram of a second vehicle blocking assembly in an equipment vehicle provided in an exemplary embodiment of the present disclosure; Figure 4 is an exploded view of a second vehicle blocking assembly in an equipment vehicle provided in an exemplary embodiment of the present disclosure; Figure 5 is a schematic structural diagram of a connecting rod portion in an equipment vehicle assembly provided in an exemplary embodiment of the present disclosure; Figure 6 is a schematic structural diagram of a driving member portion of an equipment vehicle assembly provided in an exemplary embodiment of the present disclosure; Figure 7 Schematic diagram of the structure of the connecting rod and the driving member in the equipment vehicle assembly provided in the exemplary embodiment of the present disclosure.

[0017] Description of Reference Numerals 1-carriage plate; 11-first connector; 12-second connector; 2-first vehicle blocking assembly; 21-supporting part; 211-supporting plate; 212-sliding groove; 213-anti-slip pad; 22-moving part; 221-moving seat; 222-sliding block; 223-first induction member; 224-moving cylinder; 3-second car-blocking assembly; 31-car-blocking plate; 311-connecting member; 312-matching member; 313-first connecting hole; 314-first connecting shaft; 315-slot body; 316-second induction member; 317-fixing hole; 32-power member; 33-spring; 4-track; 5-connecting rod; 6-driving member; 7-second connecting hole; 8-second connecting shaft. DETAILED DESCRIPTION

[0018] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0019] In the present disclosure, unless otherwise stated, the directional words used, such as "up, down, high, low, top, bottom", generally refer to the orientation of the corresponding component or structure in the direction of gravity. "Inside and outside" refer to the inside and outside of the outline of the corresponding component. In addition, it should be noted that the terms used, such as "first, second", etc., are intended to distinguish one element from another and do not have order and importance. In addition, in the description with reference to the accompanying drawings, the same mark in different drawings represents the same element. The above definitions are only used to explain and illustrate the present disclosure and should not be construed as limitations on the present disclosure.

[0020] For ease of understanding, please refer to the attached Figures 1 to 7 , the specific structure and working principle of the equipment vehicle and equipment vehicle components disclosed in the present invention are explained in detail in combination with the embodiments.

[0021] The present disclosure relates to an equipment vehicle. When the equipment vehicle is parked, the vehicle plate 1 can be fixed by the first vehicle blocking component 2 and the second vehicle blocking component 3. It is also convenient to move the equipment vehicle without the participation of staff, which can save human resources and ensure the safety of staff. Figure 1 , Figure 3 and Figure 5 The equipment vehicle disclosed in the present invention includes a disc 1, on which wheels are arranged, and other necessary excavating equipment, etc. can also be arranged on the top surface thereof. A first vehicle blocking assembly 2 and a second vehicle blocking assembly 3 are arranged on the bottom surface of the disc 1. The two vehicle blocking assemblies are fixed synchronously when the equipment vehicle is fixed, so that even if one set of the vehicle blocking assemblies fails, the equipment vehicle will not move on the track.

[0022] Continue to see Figure 1 and Figure 3 The first car blocking assembly 2 includes a support portion 21 and a moving portion 22. The support portion 21 is connected to the vehicle disc 1. The moving portion 22 is connected to the wheel and can drive the wheel to move away from the track 4, so that the support portion 21 can contact the track 4, thereby preventing the equipment vehicle from moving. The second car blocking assembly 3 includes a car blocking plate 31 and a power member 32. At least two car blocking plates 31 are symmetrically arranged relative to the track 4. The power member 32 is connected to the car blocking plates 31 and can drive the two car blocking plates 31 to move in a direction close to each other, so that the two car blocking plates 31 can clamp the track 4 to prevent the equipment vehicle from moving. Of course, in other embodiments, there can be more car blocking plates 31, and two car blocking plates 31 can also be matched with a power member 32 to complete the clamping of the track 4 and improve the effect of the second car blocking assembly 3.

[0023] The equipment vehicle disclosed in the present invention is fixed by two sets of vehicle-blocking components, wherein the first vehicle-blocking component 2 makes the wheels leave the track 4 and then supports the vehicle disc 1 through the support part 21 to limit the movement of the equipment vehicle, and the second vehicle-blocking component 3 clamps the track 4 through two vehicle-blocking plates 31 to limit the movement of the equipment vehicle. The two sets of vehicle-blocking components cooperate with each other to better fix the equipment vehicle, and even if one set of the vehicle-blocking components fails, it will not cause the movement of the equipment vehicle, and when the equipment vehicle needs to continue to move, the two sets of vehicle-blocking components can also be automatically opened without direct operation by the staff, thereby improving the efficiency of the equipment vehicle movement and ensuring the safety of the staff.

[0024] In one embodiment of the present disclosure, see Figure 1 and Figure 2 The support part 21 includes support plates 211 located on both sides of the wheel radial direction. One side of the support plate 211 is fixedly connected to the disc 1, and the other side is used to contact the track 4. When the moving part 22 does not drive the wheel to move, the support plate 211 is a certain distance away from the track 4 at the junction of the wheel and the track 4. When the moving part 22 drives the wheel to move, the support plate 211 will contact the track 4, using the gravity of the equipment vehicle to prevent the movement of the equipment vehicle, and the support plate 211 can also provide support and connection positions for the vehicle blocking plate 31 in the second vehicle blocking component 3. In this embodiment, an anti-skid pad 213 is also provided on the side of the support plate 211 that is not in contact with the disc 1. The anti-skid pad 213 can be a rubber, cow tendon anti-skid pad, etc. By providing the anti-skid pad 213, the friction between the support plate 211 and the track 4 can be increased, so that the vehicle blocking effect of the first vehicle blocking component 2 is better.

[0025] In one embodiment of the present disclosure, see Figure 1 and Figure 2 The moving part 22 includes a moving seat 221, and the wheel is rotatably connected to the moving seat 221. When the wheel needs to be moved, it is only necessary to move the moving seat 221 without direct contact with the wheel, thereby avoiding damage to the wheel during the movement. In this embodiment, two support plates 211 are provided, which are respectively located on both sides of the moving seat 221 along the radial direction of the wheel, and a slide groove 212 is also provided on the opposite side of the two support plates 211. The extension direction of the slide groove 212 is the same as the moving direction of the moving seat 221, which can be extended in the vertical direction. Slide blocks 222 located in the slide groove 212 are provided on both sides of the moving seat 221 along the radial direction of the wheel, and the slide blocks 222 can extend the extension direction of the slide groove 212 to reciprocate. By providing the slide groove 212 and the slide block 222 on the support plate 211 and the moving seat 221, the moving direction of the moving seat 221 can be limited, the stability of the wheel during the movement process can be ensured, and damage to the moving seat 221 or the wheel can be avoided.

[0026] In one embodiment of the present disclosure, see Figure 1 and Figure 2 A first sensing member 223 is provided at the bottom of the slide groove 212. The first sensing member 223 may be a distance sensor. By providing the first sensing member 223, the position of the slider 222 in the slide groove 212 can be sensed, thereby determining whether the position of the wheel has deviated from the track 4 and whether the support plate 211 has contacted the track 4, so as to ensure the effect of the first vehicle blocking assembly 2. Of course, in other embodiments, the type of the first sensing member 223 may also be other types, which may be determined according to actual conditions, and the present disclosure does not limit this.

[0027] In one embodiment of the present disclosure, see Figure 1 and Figure 2 The moving part 22 also includes a moving cylinder 224. The end of the moving cylinder 224 is fixedly connected to the wheel plate 1, and the driving end is connected to the moving seat 221. When the moving seat 221 needs to be driven to move, the moving cylinder 224 can be started, and the driving end of the moving cylinder 224 drives the moving seat 221 and the wheel to move. Of course, in other embodiments, the moving part 22 can also include other power structures to drive the moving seat 221 to move, which can be determined according to actual conditions, and the present disclosure does not limit this.

[0028] In one embodiment of the present disclosure, see Figure 3 and Figure 4 The power member 32 includes a power cylinder. A connecting member 311 and a matching member 312 are provided on opposite sides of two mutually symmetrical anti-wheel block plates 31 in the second anti-wheel block assembly 3. A first connecting hole 313 is provided on the connecting member 311 and the matching member 312, and the first connecting holes 313 of the connecting member 311 and the matching member 312 overlap with each other. A first connecting shaft 314 is also provided in the first connecting hole 313 to rotatably connect the two symmetrically arranged anti-wheel block plates 31 relative to the first connecting shaft 314.

[0029] Specifically, see Figure 3 The connecting member 311 can be a first rectangular block arranged in the middle of the inner side of the vehicle blocking plate 31, on which a first connecting hole 313 is arranged, and the matching member 312 can be two second rectangular blocks arranged at the edge position of the inner side of the other vehicle blocking plate 31, on which a first connecting hole 313 is arranged. When installing, it is only necessary to place the first rectangular block in the interval between the two second rectangular blocks. After the three first connecting holes 313 overlap, the installation of the first connecting shaft 314 can be completed.

[0030] The power cylinder is located between the two car blocking plates 31, with the end fixed on one of the car blocking plates 31 and the driving end fixed on the other car blocking plate 31. When the track 4 needs to be clamped, the driving end of the power cylinder will contract, driving the two car blocking plates 31 to rotate toward each other along the first connecting shaft 314 to clamp the track 4. When the track 4 needs to be released, the driving end of the power cylinder will drive the two car blocking plates 31 to rotate away from each other to release the track 4. Of course, in other embodiments, the car blocking plates 31 and the power member 32 may also be other structures, which can be determined according to actual conditions, and the present disclosure does not limit this.

[0031] In one embodiment of the present disclosure, see Figure 3 and Figure 4 A groove 315 is provided at the clamping end of the anti-vehicle sheet 31. The groove 315 can make the clamping end of the anti-vehicle sheet 31 fit more closely with the track 4 when clamping the track 4, and is not easy to separate, thereby improving the anti-vehicle effect of the second anti-vehicle assembly 3. In this embodiment, an anti-skid pad 213 is also provided in the groove 315. The anti-skid pad 213 can be a rubber, tendon anti-skid pad, etc. The friction between the groove 315 and the track 4 can be increased by providing the anti-skid pad 213, further increasing the anti-vehicle effect of the second anti-vehicle assembly 3.

[0032] In one embodiment of the present disclosure, see Figure 3 and Figure 4 A second sensing member 316 is provided between the two vehicle blocking plates 31. The second sensing member 316 may be a distance sensor. The second sensing member 316 may sense the distance between the two vehicle blocking plates 31, thereby determining whether the vehicle blocking plates 31 have clamped the track 4, so as to ensure the effect of the second vehicle blocking assembly 3. Of course, in other embodiments, the type of the second sensing member 316 may also be other types, which may be determined according to actual conditions, and the present disclosure does not limit this.

[0033] In one embodiment of the present disclosure, see Figure 3 and Figure 4 A spring 33 is provided between the two car-blocking plates 31 . The spring 33 can assist the power cylinder in moving the car-blocking plates 31 when the power cylinder contracts, and can also provide elastic force for movement when the power cylinder protrudes, thereby maintaining the movement effect of the two car-blocking plates 31 .

[0034] When the equipment vehicle disclosed in the present invention is in use, the first vehicle blocking component 2 and the second vehicle blocking component 3 can synchronously block the vehicle disc 1, wherein the moving cylinder 224 on the first vehicle blocking component 2 drives the moving seat 221 to move in the slide groove 212, so that the wheels in the moving seat 221 are separated from the track 4 and the connection between the support plate 211 and the track 4, so that the first vehicle blocking component 2 can achieve the vehicle blocking effect, and the power member 32 in the second vehicle blocking component 3 will drive the two vehicle blocking plates 31 to rotate in the direction of approaching each other relative to the first connecting shaft 314, so that the two vehicle blocking plates 31 can clamp the track 4, thereby completing the fixation of the equipment vehicle, and when the equipment vehicle needs to move, the moving cylinder 224 can drive the wheels to contact the track 4, and separate the support plate 211 from the track 4, and the power member 32 will drive the two vehicle blocking plates 31 to rotate in the direction of moving away from each other, so that the equipment vehicle resumes moving.

[0035] In a second aspect of the present disclosure, there is also provided an equipment vehicle system, see Figure 5 , Figure 6 and Figure 7 The equipment vehicle system disclosed in the present invention includes a plurality of equipment vehicle groups and a control component. The equipment vehicle group includes a plurality of equipment vehicles described in the above embodiments. Adjacent equipment vehicles in the equipment vehicle group are connected by connecting rods 5, and adjacent equipment vehicle groups are connected by driving members 6. When the equipment vehicle system is moved, one group of equipment vehicle groups will be fixed to the track 4 by the first vehicle blocking component 2 and the second vehicle blocking component 3, and the other group of equipment vehicle groups will move under the action of the driving member 6. The connecting rod 5 can ensure that the multiple equipment vehicles in the equipment vehicle group move synchronously, and the control component can control the fixation and movement of different equipment vehicle groups to ensure the stability of the movement of the equipment vehicle system.

[0036] In one embodiment of the present disclosure, see Figure 5 , Figure 6 and Figure 7, a first connector 11 and a second connector 12 are arranged on the wheel disc 1, a second connecting hole 7 is arranged at one end of the connecting rod 5 and the driving member 6, which cooperates with the first connector 11 and has an axis extending in the first direction, and a second connecting shaft 8 is arranged at the other end, which cooperates with the second connector 12 and has an axis arranged in the second direction, and the first direction and the second direction are perpendicular to each other. With such an arrangement, when two adjacent equipment vehicles or equipment vehicle components need to rotate relative to each other and turn, the second connecting hole 7 at one end of the connecting rod 5 or the driving member 6 will rotate relative to the first connector 11, so that the two equipment vehicles or equipment vehicle components can rotate relative to each other without getting stuck, and when two adjacent equipment vehicles or equipment vehicle components need to rotate uphill or downhill, the second connecting shaft 8 at the other end of the connecting rod 5 or the driving member 6 will rotate relative to the second connector 12, so that the two equipment vehicles or equipment vehicle components can rotate relative to each other without getting stuck. The second connecting hole 7 and the second connecting shaft 8 can also be arranged in the opposite direction, which will not be described in detail here.

[0037] When the equipment vehicle system disclosed in the present invention is moving, a group of equipment vehicle components will be fixed and have triple fixation. The first fixation is that the disc 1 is installed, the wheels are not loaded, and the support plate 211 is in direct contact with the track to prevent the disc 1 from moving on the track 4; the second fixation is that the second vehicle blocking component 3 of the disc 1 clamps the track 4 through two vehicle blocking plates 31 to prevent the disc 1 from moving on the track 4; the third fixation is that when the disc 1 is used as a fixed point to move other discs 1 forward, the power cylinder will be supplied with fluid first to maximize the extension of the piston rod, and the two vehicle blocking plates 31 will be subjected to greater thrust, thereby clamping the track 4 more stably.

[0038] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0039] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0040] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An equipment vehicle, comprising a chassis, on which wheels are arranged, characterized in that: include: A first wheel-blocking assembly comprises a supporting portion and a moving portion, wherein the supporting portion is connected to the wheel disc, and the moving portion is connected to the wheel to drive the wheel to move so that the supporting portion can contact the track; The second car-blocking assembly includes a car-blocking plate and a power member. At least two car-blocking plates are symmetrically arranged relative to the track. The power member is connected to the car-blocking plates and is used to drive the car-blocking plates to move in a direction approaching each other so as to clamp the track.

2. The equipment vehicle according to claim 1, characterized in that: The support portion comprises support plates located at both radial sides of the wheel, and a non-slip pad is arranged on one side of the support plate in contact with the track.

3. The equipment vehicle according to claim 2, characterized in that: The moving part includes a moving seat, the wheel is rotatably connected to the moving seat, the support plate is located on both sides of the moving seat along the radial direction of the wheel, and a slide groove is provided on the side of the support plate facing the wheel, and sliders located in the slide groove are provided on both sides of the moving seat.

4. The equipment vehicle according to claim 3, characterized in that: A first sensing element is disposed at the bottom of the slide groove, and the first sensing element is used to sense the position of the sliding block.

5. The equipment vehicle according to claim 3, characterized in that: The moving part also includes a moving cylinder, one end of which is fixedly connected to the vehicle disc, and a driving end of which is connected to the moving seat for driving the moving seat to move.

6. The equipment vehicle according to claim 1, characterized in that: The two symmetrically arranged vehicle blocks are provided with connecting parts and mating parts facing each other, and the connecting parts and mating parts are both provided with first connecting holes, and the two first connecting holes overlap, and a first connecting shaft is provided in the first connecting hole, and the power part is a power cylinder provided between the two vehicle blocks, one end of the power cylinder is fixed on one of the vehicle blocks, and the driving end is fixedly connected to the other vehicle block, so as to drive the two vehicle blocks to rotate in a direction approaching each other relative to the first connecting shaft.

7. The equipment vehicle according to claim 6, characterized in that: The clamping end of the vehicle blocking sheet is provided with a groove body, the shape of the groove body is adapted to the track, and an anti-slip pad is provided in the groove body.

8. The equipment vehicle according to claim 6, characterized in that: A second sensing element is also arranged between the two symmetrically arranged vehicle blocking plates, and the second sensing element is used to sense the distance between the two vehicle blocking plates.

9. An equipment vehicle system, characterized in that: It comprises a plurality of equipment vehicle groups and a control component, wherein the equipment vehicle group comprises a plurality of equipment vehicles according to any one of claims 1 to 8, adjacent equipment vehicles in the equipment vehicle group are connected via connecting rods, and adjacent equipment vehicle groups are connected via driving members.

10. The equipment vehicle system according to claim 9, characterized in that: A first connector and a second connector are provided on the vehicle disc, and a second connecting hole matching with the first connector and with an axis extending along a first direction is provided at one end of the connecting rod and the driving member, and a second connecting shaft matching with the second connector and with an axis extending along a second direction is provided at the other end, and the first direction and the second direction are perpendicular to each other.

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