Isolation device for paste filling support

By designing an isolation device that can adjust the height and width, combined with flexible contacts, the leakage problem caused by the isolation baffle gap in the paste filling bracket is solved, the sealing effect and working efficiency are improved, and the production cost is reduced.

CN222296295UActive Publication Date: 2025-01-03SHANDONG LUNAN GRP ENERGY EQUIP MFG
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202421021548.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-11
Publication Date
2025-01-03
Estimated Expiration
2034-05-11

AI Technical Summary

Technical Problem

There are large gaps between the isolation baffles of the existing paste filling brackets, which affect the sealing effect, lead to paste penetration, affect work efficiency and increase production costs.

Method used

An isolation device including a base, lifting assembly, isolation assembly and sealing assembly is designed to adjust the baffle height and width through the lifting assembly and jack, and combine flexible contacts to seal the gaps and ensure sealing.

Benefits of technology

Effectively seal the gaps between the isolation devices, reduce the probability of paste leakage, improve filling efficiency, reduce subsequent cleaning work, and reduce production costs.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222296295U_ABST
    Figure CN222296295U_ABST
Patent Text Reader

Abstract

The utility model provides an isolating device for a pasty fluid filling support. The isolating device comprises a base; the lifting assembly is connected with the base, and the lifting assembly is movably arranged relative to the base; the isolation assembly comprises a baffle, the baffle is connected with the lifting assembly and used for isolating the filling area, and the lifting assembly moves to drive the baffle to move, so that the height of the baffle is adjusted; and the sealing assembly comprises two side protection plates, the two side protection plates are arranged at the two ends of the baffle correspondingly, the side protection plates are movably arranged relative to the baffle, and the moving direction of the side protection plates is perpendicular to the moving direction of the lifting assembly. The isolation device for the paste filling support solves the technical problem that gaps exist between isolation baffles in the prior art, and the sealing effect is affected.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of mining, in particular to an isolation device for a paste-filled support. Background Art

[0002] Paste filling is a mining technology that fills the goaf with special paste as the mining face advances to prevent ground collapse.

[0003] By setting up the isolation baffle and then lifting the isolation baffle with the lifting hydraulic rod, the process of automatically expanding up and down to complete the sealing of the tail end of the bracket is realized. The sealing of the filling area is usually done by arranging dozens of brackets in sequence, and connecting dozens of isolation baffles on each bracket into a wall to isolate and seal the filling area. However, after dozens of brackets are spliced ​​together, there is still a large gap between the isolation baffles of two adjacent brackets due to factors such as uneven ground, causing the paste to penetrate outward from the gap, seriously affecting the sealing effect.

[0004] Therefore, the prior art needs to be further developed. Utility Model Content

[0005] The purpose of the utility model is to overcome the above technical deficiencies and provide an isolation device for a paste-filled bracket to solve the technical problem in the related art that gaps exist between isolation baffles, affecting the sealing effect.

[0006] In order to achieve the above-mentioned technical purpose, the utility model adopts the following technical scheme: an isolation device for a paste filling bracket is provided, including: a base; a lifting assembly, the lifting assembly is connected to the base, and the lifting assembly is movably arranged relative to the base; an isolation assembly, the isolation assembly includes a baffle, the baffle is connected to the lifting assembly, the baffle is used to isolate the filling area, the lifting assembly moves, driving the baffle to move, thereby adjusting the height of the baffle; a sealing assembly, the sealing assembly includes a side guard plate, there are two side guard plates, the two side guard plates are respectively arranged at both ends of the baffle, the side guard plates are movably arranged relative to the baffle, and the moving direction of the side guard plate is perpendicular to the moving direction of the lifting assembly.

[0007] Furthermore, the baffle includes an upper baffle and a lower baffle, which are staggered in the vertical direction; the upper baffle is connected to the lifting assembly, and the lifting assembly moves to drive the upper baffle to move, thereby adjusting the height of the upper baffle, and the lower baffle is connected to the base.

[0008] Furthermore, the isolation assembly also includes a plug plate, which is connected to the lower baffle plate and is movably arranged in a vertical direction.

[0009] Furthermore, the isolation assembly also includes a plug plate jack, the telescopic rod of the plug plate jack is connected to the plug plate, and the plug plate is moved by the telescopic movement of the telescopic rod; a flexible contact piece is provided on one side of the plug plate close to the base, and the flexible contact piece is used to isolate the filling area.

[0010] Furthermore, the side guard plate includes two first side guard plates, the two first side guard plates are respectively arranged at both ends of the upper baffle plate, the first side guard plate is movably arranged relative to the upper baffle plate, and the moving direction of the first side guard plate is perpendicular to the moving direction of the lifting assembly.

[0011] Furthermore, the sealing assembly also includes a first jack, both ends of which are respectively connected to each first side guard plate, and the two ends of the first jack extend and retract to drive the first side guard plate to move.

[0012] Furthermore, the side guard plate also includes two second side guard plates, which are respectively arranged at both ends of the lower baffle plate. The second side guard plate is movably arranged relative to the lower baffle plate, and the moving direction of the second side guard plate is perpendicular to the moving direction of the lifting assembly.

[0013] Furthermore, the sealing assembly also includes a second jack, both ends of which are respectively connected to each second side guard plate, and the two ends of the second jack are extended and retracted to drive the second side guard plates to move.

[0014] Furthermore, a column is provided on the base, the column is perpendicular to the base, the lifting assembly includes a lifting frame and a third jack, the third jack is fixed on the column, one end of the lifting frame is connected to the upper baffle, and the other end of the lifting frame is connected to the telescopic rod of the third jack, and the telescopic movement of the third jack drives the lifting frame to move, thereby lifting and lowering the upper baffle.

[0015] Furthermore, the lifting frame includes two first connecting rods and a second connecting rod. The first connecting rod is a hollow structure. The third jack is located inside the first connecting rod and connected to the column. The first connecting rod is sleeved on the column. The second connecting rod is connected to the upper baffle. The first connecting rod is perpendicular to the second connecting rod. The third jack drives the first connecting rod to move on the column, thereby driving the second connecting rod to move.

[0016] Beneficial effects:

[0017] 1. By using the isolation device for the paste filling support of the utility model, the side guard plates on both sides of the upper and lower baffles are extended and retracted horizontally to adjust the width of the isolation wall in the filling area, thereby blocking the gaps between dozens of isolation devices to prevent leakage during paste filling.

[0018] 2. The isolation device for the paste filling support of the utility model is adopted, and a flexible contact piece is added to the bottom of the plug plate. When there is a slope in the coal seam bottom plate or the floor is uneven, the plug plate has a good fit when it descends and contacts the coal seam bottom plate, thereby reducing the probability of paste leakage.

[0019] 3. The isolation device for the paste filling support of the utility model is adopted, and the upper baffle can be raised and lowered. The height of the isolation wall of the filling area is adjusted by longitudinal movement. Combined with the lateral extension and contraction of the side guard plate, the upper and lower ends of the baffle of the paste filling support isolation device and the top and bottom plates of the coal seam, and the gaps between adjacent filling supports are closed, thereby reducing the probability of paste leakage, improving the efficiency of paste filling, avoiding subsequent cleaning work caused by paste leakage, improving work efficiency, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of an isolation device used in an embodiment of the utility model from one perspective;

[0021] Figure 2 It is a structural schematic diagram of the isolation device adopted in the embodiment of the utility model from another perspective;

[0022] Figure 3 It is a structural schematic diagram of a lower baffle plate of an isolation device used in an embodiment of the utility model;

[0023] Figure 4 This is a diagram of the use state of the first jack of the isolation device used in the embodiment of the utility model pushing and pulling the first side guard plate to actively extend and retract;

[0024] Figure 5 This is a diagram of the use state of the guide spring assembly of the isolation device used in the embodiment of the utility model driving the first side guard plate to passively extend and retract;

[0025] Figure 6 It is a usage status diagram of the isolation device adopted in the embodiment of the utility model.

[0026] The above drawings include the following reference numerals:

[0027] 1. Base; 11. Column; 2. Lifting assembly; 21. Lifting frame; 211. First connecting rod; 212. Second connecting rod; 22. Third jack; 3. Isolation assembly; 31. Baffle; 311. Upper baffle; 312. Lower baffle; 32. Insert plate; 33. Insert plate jack; 34. Flexible contact piece; 4. Sealing assembly; 41. Side guard plate; 411. First side guard plate; 412. Second side guard plate; 42. First jack; 43. Second jack; 44. Guide spring assembly; 45. Locking assembly. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0029] According to an embodiment of the utility model, an isolation device for a paste-filled stent is provided. Figures 1 to 6 , including: a base 1; a lifting assembly 2, the lifting assembly 2 is connected to the base 1, and the lifting assembly 2 is movably arranged relative to the base 1; an isolation assembly 3, the isolation assembly 3 includes a baffle 31, the baffle 31 is connected to the lifting assembly 2, and the baffle 31 is used to isolate the filling area. The lifting assembly 2 moves, driving the baffle 31 to move, thereby adjusting the height of the baffle 31; a sealing assembly 4, the sealing assembly 4 includes a side guard plate 41, and the side guard plates 41 are two, and the two side guard plates 41 are respectively arranged at both ends of the baffle plate 31. The side guard plates 41 are movably arranged relative to the baffle plate 31, and the moving direction of the side guard plates 41 is perpendicular to the moving direction of the lifting assembly 2. Several paste filling brackets are arranged in sequence and connected, and the baffles 31 of the isolation device at the tail end of each bracket are also arranged in sequence to isolate the filling area. Several arranged baffles 31 are equivalent to the isolation wall between the filling area and the working surface. The lifting assembly 2 drives the baffle 31 to move up and down in the vertical direction, which is equivalent to adjusting the height of the isolation wall. After the brackets are arranged, there is still a large gap between the isolation baffles of two adjacent brackets due to factors such as uneven ground. Two side guard plates 41 are respectively arranged at both ends of the baffle 31, and the two side guard plates 41 are movable relative to the baffle 31. Horizontally moving the two side guard plates 41 is equivalent to expanding the width of the isolation wall corresponding to each bracket, thereby sealing the gap between two adjacent brackets to prevent leakage during paste filling. The height of the isolation wall of the filling area is longitudinally adjusted by the lifting component 2, and the gap between the brackets is laterally blocked in conjunction with the movable baffle 31 to improve the sealing of the filling paste. The isolation device for the paste filling bracket of this embodiment solves the technical problem in the related art that there is a gap between the isolation baffles, which affects the sealing effect.

[0030] See also Figure 1 and Figure 2In the isolation device for the paste filling support of this embodiment, the baffle 31 includes an upper baffle 311 and a lower baffle 312, and the upper baffle 311 and the lower baffle 312 are arranged in a staggered manner in the vertical direction; the upper baffle 311 is connected to the lifting component 2, and the lifting component 2 moves to drive the upper baffle 311 to move, thereby adjusting the height of the upper baffle 311, and the lower baffle 312 is connected to the base 1. The upper baffle 311 and the lower baffle 312 are arranged in a staggered manner in the vertical direction, and the two together form an isolation wall of the filling area. The lower baffle 312 is fixed, and the upper baffle 311 is connected to the lifting component 2, and the lifting component 2 is lifted and lowered to drive the upper baffle 311 to move, thereby adjusting the height of the isolation wall of the filling area.

[0031] See also Figure 2 and Figure 3 In the isolating device for the paste filling support of the present embodiment, the isolating assembly 3 further comprises a plug plate 32, which is connected to the lower baffle plate 312 and is movably arranged in the vertical direction. The lower baffle plate 312 is fixed on the base 1, and the plug plate 32 is movable relative to the lower baffle plate 312. The plug plate 32 moves downward to cover the gap between the lower baffle plate 312 and the coal seam floor, thereby improving the sealing performance.

[0032] See also Figure 1 The isolation device for the paste filling support of this embodiment, the isolation assembly 3 also includes a plug plate jack 33, the telescopic rod of the plug plate jack 33 is connected to the plug plate 32, and the plug plate 32 is driven to move by the telescopic rod; a flexible contact member 34 is provided on the side of the plug plate 32 close to the base 1, and the flexible contact member 34 is used to isolate the filling area. The plug plate jack 33 is extended and pulled to move the plug plate 32 away from or close to the coal seam floor, and a flexible contact member 34 is added to the end of the plug plate 32 close to the coal seam floor. In the case that the coal seam floor has a slope or the floor is uneven, the plug plate jack 33 is extended to push the plug plate 32 down, so that the plug plate 32 has a good fit with the coal seam floor when in contact, reducing the probability of paste leakage.

[0033] See also Figure 4 In the isolation device for the paste-filled support of this embodiment, the side guard plate 41 includes a first side guard plate 411. There are two first side guard plates 411, which are respectively arranged at the two ends of the upper baffle plate 311. The first side guard plates 411 are movably arranged relative to the upper baffle plate 311, and the moving direction of the first side guard plates 411 is perpendicular to the moving direction of the lifting assembly 2. The lifting assembly 2 moves up and down to adjust the height of the isolation wall of the filling area, and the first side guard plates 411 are extended and retracted horizontally to adjust the width of both sides of the upper baffle plate 311, so as to seal the gap between two adjacent upper baffle plates 311.

[0034] See also Figure 1In the isolating device for the paste-filled bracket of this embodiment, the sealing assembly 4 further includes a first jack 42, the two ends of the first jack 42 are respectively connected to each first side guard plate 411, and the two ends of the first jack 42 are extended and retracted to drive the two first side guard plates 411 to move. The first jack 42 is extended and retracted to push or pull back the two first side guard plates 411, thereby realizing the lateral movement of the first side guard plates 411.

[0035] See also Figure 3 In the isolating device for the paste-filled bracket of this embodiment, the side guard plate 41 further includes a second side guard plate 412. There are two second side guard plates 412, which are respectively arranged at the two ends of the lower baffle plate 312. The second side guard plates 412 are movably arranged relative to the lower baffle plate 312, and the moving direction of the second side guard plates 412 is perpendicular to the moving direction of the lifting assembly 2. The second side guard plates 412 are extended and retracted laterally to adjust the width of both sides of the lower baffle plate 312 and seal the gap between two adjacent lower baffle plates 312.

[0036] See also Figure 3 In the isolating device for the paste-filled bracket of this embodiment, the sealing assembly 4 further includes a second jack 43, the two ends of the second jack 43 are respectively connected to each second side guard plate 412, and the two ends of the second jack 43 are extended and retracted to drive the two second side guard plates 412 to move. The second jack 43 pushes or pulls back the two second side guard plates 412, thereby realizing the lateral movement of the second side guard plates 412. The first side guard plate 411 and the second side guard plate 412 move simultaneously to seal the gaps on both sides of the upper baffle plate 311 and the lower baffle plate 312 respectively.

[0037] The isolating device for the paste-filled bracket of this embodiment is provided with an active guide rod between the first jack 42 and the two first side guard plates 411. The first jack 42 is extended and pulled to push and pull the active guide rod, thereby driving the two first side guard plates 411 to move. The locking assembly 45 is used to position the first jack 42 and the active guide rod, so that the first jack 42 has a fixed point (such as Figure 3 and Figure 4 As shown). Guide spring assemblies 44 are also provided at the upper and lower ends of the first side guard plate 411. A spring is sleeved in the guide rod. The two ends of the spring are respectively connected to the two first side guard plates 411. The upper and lower guide spring assemblies 44 and the active guide rod are parallel to each other and spaced apart. When the active guide rod pulls the first side guard plate 411 to move in the middle, the guide spring assemblies 44 at the upper and lower ends are passively extended and retracted. When the first side guard plate 411 is retracted, the spring is in a compressed state. In order to prevent the spring from popping out, the guide spring assembly 44 is fixed with a locking assembly 45 to prevent the guide spring assembly 44 from driving the first side guard plate 411 to move to both sides (as shown). Figure 3 and Figure 5As shown), with the cooperation of the active guide rod and the guide spring assembly 44, the first side guard plates 411 on both sides can move smoothly.

[0038] See also Figure 1 and Figure 6 In the isolating device for the paste-filled support of this embodiment, a column 11 is arranged on the base 1, and the column 11 is perpendicular to the base 1. The lifting assembly 2 includes a lifting frame 21 and a third jack 22. The third jack 22 is fixed on the column 11. One end of the lifting frame 21 is connected to the upper baffle 311, and the other end of the lifting frame 21 is connected to the telescopic rod of the third jack 22. The telescopic movement of the third jack 22 drives the lifting frame 21 to move, thereby lifting and lowering the upper baffle 311. The column 11 is arranged perpendicular to the base 1, and the third jack 22 pushes and pulls the lifting frame 21 on the column 11, and the lifting frame 21 drives the upper baffle 311 to move vertically.

[0039] See also Figure 1 The isolation device for the paste-filled support of this embodiment, the lifting frame 21 includes two first connecting rods 211 and a second connecting rod 212, the first connecting rod 211 is a hollow structure, the third jack 22 is located in the first connecting rod 211 and connected to the column 11, the first connecting rod 211 is sleeved on the column 11, the second connecting rod 212 is connected to the upper baffle 311, the first connecting rod 211 is perpendicular to the second connecting rod 212, and the third jack 22 drives the first connecting rod 211 to move on the column 11, thereby driving the second connecting rod 212 to move. The third jack 22 is fixed in the column 11, the third jack 22 is inside the first connecting rod 211, when the third jack 22 is extended, it supports the top of the first connecting rod 211 to make the first connecting rod 211 move up, and when the third jack 22 is contracted, it drives the first connecting rod 211 to move down, so that the second connecting rod 212 connected to the first connecting rod 211 drives the upper baffle 311 to move up and down. The first connecting rod 211 and the second connecting rod 212 are vertically arranged, and the second connecting rod 212 and the upper baffle plate 311 are vertically arranged, so that the upper baffle plate 311 is parallel to the first connecting rod 211, and the lower baffle plate 312 is between the upper baffle plate 311 and the first connecting rod 211, occupying less space.

[0040] When implementing the isolation work, after adjusting the height of the upper baffle 311, the first jack 42 extends the first side guard plate 411 to block the two sides of the upper baffle 311, and the second jack 43 extends the two second side guard plates 412 to block the two sides of the lower baffle 312, so that the horizontal and vertical directions of the isolation wall of the filling area are blocked. Then, the plug jack 33 extends the plug 32, so that the flexible contact member 34 fits the coal seam floor and causes it to produce elastic deformation. Even if there is a slope on the coal seam floor or the floor is uneven, the flexible contact member 34 can produce different degrees of elastic deformation, thereby increasing the fit of the contact surface and achieving the purpose of reducing paste leakage.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0043] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0044] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0045] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An isolation device for a paste-filled stent, characterized in that: include: Base (1); A lifting component (2), the lifting component (2) being connected to the base (1), and the lifting component (2) being movably arranged relative to the base (1); An isolation assembly (3), the isolation assembly (3) comprising a baffle (31), the baffle (31) being connected to the lifting assembly (2), the baffle (31) being used to isolate the filling area, the lifting assembly (2) moving to drive the baffle (31) to move, thereby adjusting the height of the baffle (31); A sealing assembly (4), the sealing assembly (4) comprising a side guard plate (41), the side guard plates (41) being two in number, the two side guard plates (41) being respectively arranged at two ends of the baffle plate (31), the side guard plates (41) being movably arranged relative to the baffle plate (31), and the moving direction of the side guard plates (41) being perpendicular to the moving direction of the lifting assembly (2); The baffle (31) comprises an upper baffle (311) and a lower baffle (312), and the upper baffle (311) and the lower baffle (312) are arranged in a staggered manner in the vertical direction; the upper baffle (311) is connected to the lifting assembly (2), and the lifting assembly (2) moves to drive the upper baffle (311) to move, thereby adjusting the height of the upper baffle (311); the lower baffle (312) is connected to the base (1); The isolation assembly (3) further comprises a plug plate (32), wherein the plug plate (32) is connected to the lower baffle plate (312), and the plug plate (32) is movably arranged in a vertical direction; The isolation assembly (3) further comprises a plug plate jack (33), wherein a telescopic rod of the plug plate jack (33) is connected to the plug plate (32), and the plug plate (32) is driven to move by the telescopic rod.

2. The isolation device for a paste-filled stent according to claim 1, characterized in that: A flexible contact piece (34) is provided on one side of the plug plate (32) close to the base (1), and the flexible contact piece (34) is used to isolate the filling area.

3. The isolation device for a paste-filled stent according to claim 2, characterized in that: The side guard plates (41) include two first side guard plates (411), the two first side guard plates (411) are respectively arranged at two ends of the upper baffle plate (311), the first side guard plates (411) are movably arranged relative to the upper baffle plate (311), and the moving direction of the first side guard plates (411) is perpendicular to the moving direction of the lifting assembly (2).

4. The isolation device for a paste-filled stent according to claim 3, characterized in that: The sealing assembly (4) further comprises a first jack (42), wherein two ends of the first jack (42) are respectively connected to each of the first side guard plates (411), and the two ends of the first jack (42) are telescopic to drive the two first side guard plates (411) to move.

5. The isolation device for a paste-filled stent according to claim 1, characterized in that: The side guard plate (41) further comprises a second side guard plate (412), wherein the number of the second side guard plates (412) is two, and the two second side guard plates (412) are respectively arranged at two ends of the lower baffle plate (312), the second side guard plates (412) are movably arranged relative to the lower baffle plate (312), and the moving direction of the second side guard plates (412) is perpendicular to the moving direction of the lifting assembly (2).

6. The isolation device for a paste-filled stent according to claim 5, characterized in that: The sealing assembly (4) further comprises a second jack (43), the two ends of the second jack (43) being respectively connected to each of the second side guard plates (412), and the two ends of the second jack (43) being telescopic to drive the two second side guard plates (412) to move.

7. The isolation device for a paste-filled stent according to claim 1, characterized in that: The base (1) is provided with a column (11), the column (11) being perpendicular to the base (1); the lifting assembly (2) comprises a lifting frame (21) and a third jack (22); the third jack (22) is fixed on the column (11); one end of the lifting frame (21) is connected to the upper baffle (311); the other end of the lifting frame (21) is connected to the telescopic rod of the third jack (22); the telescopic movement of the third jack (22) drives the lifting frame (21) to move, thereby lifting and lowering the upper baffle (311).

8. The isolation device for a paste-filled stent according to claim 7, characterized in that: The lifting frame (21) comprises two first connecting rods (211) and a second connecting rod (212); the first connecting rod (211) is a hollow structure; the third jack (22) is located inside the first connecting rod (211) and is connected to the column (11); the first connecting rod (211) is sleeved on the column (11); the second connecting rod (212) is connected to the upper baffle (311); the first connecting rod (211) is perpendicular to the second connecting rod (212); the third jack (22) drives the first connecting rod (211) to move on the column (11), thereby driving the second connecting rod (212) to move.