Fixture for grinding flashboard

Abstract

The invention discloses a flashboard grinding clamp, relates to the technical field of valve machining, and particularly relates to an angle self-adaptive adjusting and locking mechanism which is used for enabling a machining plane of a flashboard with inclined planes at different angles to be a horizontal plane after the flashboard is clamped. The angle self-adaptive adjusting and locking mechanism comprises an angle self-adaptive adjusting assembly and a locking assembly, wherein the angle self-adaptive adjusting assembly is used for detecting the inclined face of the gate plate and then adjusting the angle of the clamp frame, and the locking assembly is used for automatically locking the clamp frame. According to the clamp, the angle self-adaptive adjusting locking mechanism is arranged in the clamp, so that the clamp can adapt to the inclination angle of the sealing surface of the flashboard, namely, the inclination angle of the clamp is the sum of the inclination angles of the two surfaces of the flashboard, the clamp can be inclined, and a locking assembly is arranged on a fixed angle; the clamp can rotate, and after the clamp is adjusted to the corresponding position, the locking assembly on the adjusting angle is locked, so that the angle of the gate plate does not need to be manually adjusted, and the effect of automatic locking after the angle is adjusted in place can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of valve processing, in particular to a gate grinding clamp. Background Art

[0002] The gate is an important part of the gate valve, mainly used to connect or cut off the medium in the pipeline. The gate valve's opening and closing parts are the gate.

[0003] After the valve gate sealing surface is assembled into the valve, the sealing surface of the gate and the vertical center line of the valve will form a certain angle, and the gate sealing surface processing accuracy requirements are very high. Therefore, the sealing surface surface needs to be fine-ground after rough machining, and a special fixture is needed to clamp and fix the gate, and then fine-grind it. Since both sealing surfaces exist, if a universal fixture is used for direct clamping, the sealing surface cannot be parallel to the horizontal plane. A special fixture is needed to align and clamp it so that the sealing surface is parallel to the horizontal plane, and then fine-grind it. At the same time, when targeting different valve models, the gate clamp will have certain differences. The existing clamp cannot automatically and adaptively adjust the inclination of the clamp according to the angle of the gate, so that the gate and the processing platform are in a horizontal state, which makes it inconvenient to grind the gate. Summary of the invention

[0004] The technical solution of the present invention is aimed at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. An embodiment of the present invention provides a gate plate grinding clamp to solve the technical problem that the existing clamp cannot adaptively adjust the clamp according to the different angles of the gate plate so that the gate plate processing surface and the processing platform are horizontal planes, making it inconvenient to grind.

[0005] The embodiment of the present invention adopts the following technical scheme: a gate plate grinding clamp, including a clamp frame, and also including a movable clamping block for clamping the gate plate, a limit block for cooperating with the clamping block to clamp the gate plate, a placement frame for limiting the height of the gate plate, and an angle adaptive adjustment locking mechanism for making the processing plane of gate plates with different inclined angles clamped to be a horizontal plane, the angle adaptive adjustment locking mechanism including an angle adaptive adjustment component for detecting the inclined surface of the gate plate and then adjusting the angle of the clamp frame, and a locking component for automatically locking the clamp frame.

[0006] Furthermore, the angle adaptive adjustment component includes a movable plate arranged on the placement frame and an adjustable electric telescopic rod arranged at one end of the clamp frame, a deflection plate is arranged above the movable plate, the deflection plate and the movable plate are connected by a rotating torsion spring shaft so that they can be deflected, two extrusion elastic liquid bags are arranged between the deflection plate and the movable plate, a hydraulic box is arranged on the side of the placement frame, the extrusion elastic liquid bags are connected by a second connecting pipe, and the two second connecting pipes are respectively located at the two ends of the hydraulic box, a liquid flow switching component is arranged in the hydraulic box, the movable end of the adjustable electric telescopic rod is provided with a support plate with a contact sensor, a hydraulic telescopic rod is arranged on the side of the adjustable electric telescopic rod, the movable end of the hydraulic telescopic rod is provided with a matching sensor, the hydraulic telescopic rod and the hydraulic box are connected by a third connecting pipe, the movable plate and the placement frame are connected by the first electric telescopic rod, and the inner diameter of the extrusion elastic liquid bag is twice the inner diameter of the fixed end of the hydraulic telescopic rod.

[0007] Furthermore, the outer diameter of the deflection plate is larger than the outer diameter of the movable plate, and the placement frame is provided with a stepped groove for use with the deflection plate and the movable plate.

[0008] Furthermore, the liquid flow switching assembly includes two connecting plates, a guide column is arranged between the two connecting plates, a sealing plate is slidably arranged on the guide column, and a blocking block used in conjunction with the flow hole of the third connecting pipe is arranged at the bottom of the sealing plate, and an elastic damper is arranged between the sealing plate and the connecting plate.

[0009] Furthermore, the connecting plate is connected to the side wall of the hydraulic box, the outer diameter of the sealing plate is the same as the inner diameter of the hydraulic box, and the outer diameter of the connecting plate is smaller than the outer diameter of the sealing plate.

[0010] Furthermore, the depth of the stepped groove on the placement rack is the same as the sum of the heights of the movable plate and the deflection plate.

[0011] Furthermore, the locking assembly includes a rotating shaft and a clamping base, a rotating block is arranged on the inner side of both ends of the clamping base, the rotating shaft is arranged on both sides of the bottom end of the clamp frame, the rotating block is located in the rotating shaft, the rotating shaft is provided with a limiting block, the limiting block and the rotating shaft are connected by a spring guide column, a guide limit rod is arranged beside the spring guide column, and the guide limit rod passes through the limiting block, a first hydraulic chamber is arranged on the stepped groove in the placement frame, and a first extrusion block is arranged in the first extrusion chamber, and a first connecting tube is arranged between the first extrusion chamber and the rotating shaft.

[0012] Furthermore, the contact surface between the limiting block and the rotating block is a friction surface.

[0013] Compared with the prior art, the beneficial effects of the present invention are: First, during use, the angle adaptive adjustment component is used so that when the gate is placed on the deflection plate, the deflection plate will automatically deflect, thereby fitting with the surface of the gate. It needs to be further explained that no matter how much the inclined surface of the gate is at this time, the deflection plate is deflected by gravity to fit the surface of the gate, so that the inclination angle of the deflection plate is the same as the inclination angle of the gate. When the gate needs to be leveled, the gate has an inclination angle of two surfaces, so that when adjusting the angle, it should be twice the inclination angle of the deflection plate. At this time, the inclination angle of the deflection plate is adjusted by squeezing the elastic liquid bag and then displacing the matching sensor, so that the height of the adjustment electric telescopic rod set at the end of the fixture frame changes, and the angle of the fixture frame changes. At this time, the angle change of the fixture frame is twice the inclination surface of the gate, so that when the gate processing surface after final clamping is horizontal with the processing platform, it is convenient for processing; Secondly, during use, the clamp does not restrict the left and right directions of the inclined surface of the gate plate (at this time, it is the left and right directions from the attached figure), so that the clamping requirements are low when the gate plate is clamped, and the liquid flow switching component can ensure that the liquid in the squeezed elastic liquid bag can flow smoothly into the hydraulic telescopic rod; Secondly, through the locking component, when the gate is initially clamped, the clamp frame can be adjusted in angle, and when the gate is placed securely, the clamp frame cannot be deflected at an angle, thereby automatically detecting whether the gate is installed in place and then locking the clamp frame; To summarize, the clamp is provided with an angle-adaptive adjustment locking mechanism therein so that the clamp can adapt to the changes in the inclination angle of the sealing surface of the gate plate, that is, the inclination angle of the clamp is the sum of the inclination angles of the two sides of the gate plate. The clamp adopts a combination of a fixed angle and an adjustment angle so that the clamp can be tilted. A locking component is provided on the fixed angle. When adjustment is required, the clamp can be rotated, and the angle of the clamp can be changed. When adjusted to the corresponding position, the locking component on the adjustment angle is locked, so that there is no need to manually adjust the angle of the gate plate, and the angle can be automatically locked after being adjusted into place. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 This is a schematic diagram of the main structure of the present invention from the first perspective; Figure 2It is a schematic diagram of the structure of the main body of the present invention from a second viewing angle; Figure 3 It is a schematic diagram of the structure of the main body of the present invention from a third viewing angle; Figure 4 It is a schematic structural diagram of the first viewing angle of the angle adaptive adjustment locking mechanism of the present invention; Figure 5 It is a schematic diagram of the second viewing angle structure of the angle adaptive adjustment locking mechanism of the present invention; Figure 6 For the present invention Figure 5 The enlarged structural diagram at A in the middle; Figure 7 It is a schematic diagram of the locking assembly structure of the present invention.

[0016] Reference numerals: 1. Clamp frame; 11. Clamping block; 12. Limit block; 13. Placement frame; 2. Angle self-adjusting locking mechanism; 21. Locking assembly; 211. Rotating block; 212. Rotating shaft; 213. Guide limit rod; 214. Limit block; 215. Clamping base; 216. First extrusion block; 217. First connecting pipe; 22. Angle self-adjusting assembly; 221. Second connecting pipe; 222. Deflection plate; 223. First electric telescopic rod; 224. Extrusion elastic liquid bag; 225. Movable plate; 226. Hydraulic box; 227. Third connecting pipe; 228. Hydraulic telescopic rod; 229. Adjustment electric telescopic rod; 23. Liquid flow switching assembly; 231. Guide column; 232. Elastic damper; 233. Closing plate; 234. Block; 235. Connecting plate. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0018] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0019] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Combine the following Figures 1 to 7 As shown, an embodiment of the present invention provides a gate grinding clamp, including a clamp frame 1, and also includes a movable clamping block 11 for clamping the gate, a limit block 12 for cooperating with the clamping block 11 to clamp the gate, a placement frame 13 for limiting the height of the gate, and an angle adaptive adjustment locking mechanism 2 for making the processing plane of gates with different angles inclined after clamping a horizontal plane, the angle adaptive adjustment locking mechanism 2 includes an angle adaptive adjustment component 22 for detecting the inclined surface of the gate and then adjusting the angle of the clamp frame 1, and a locking component 21 for automatically locking the clamp frame 1.

[0023] When working, the clamp is provided with an angle-adaptive adjustment locking mechanism 2 therein so that the clamp can adapt to the changes in the inclination angle of the sealing surface of the gate plate, that is, the inclination angle of the clamp is the sum of the inclination angles of the two sides of the gate plate. The clamp adopts a combination of a fixed angle and an adjustable angle so that the clamp can be tilted. A locking component 21 is provided on the fixed angle. When adjustment is required, the clamp can be rotated, and the angle of the clamp can be changed. When adjusted to the corresponding position, the locking component 21 on the adjusting angle is locked, so that there is no need to manually adjust the angle of the gate plate, and it can be automatically locked after the angle is adjusted.

[0024] Specifically, the angle adaptive adjustment component 22 includes a movable plate 225 arranged on the placement frame 13 and an adjustable electric telescopic rod 229 arranged at one end of the clamp frame 1, a deflection plate 222 is arranged above the movable plate 225, and the deflection plate 222 and the movable plate 225 are connected by a rotating torsion spring shaft so that they can deflect, and two extrusion elastic liquid capsules 224 are arranged between the deflection plate 222 and the movable plate 225, and a hydraulic box 226 is arranged on the side of the placement frame 13, and the extrusion elastic liquid capsules 224 are connected by a second connecting pipe 221, and the two second connecting pipes 221 are respectively located at At both ends of the hydraulic box 226, a liquid flow switching component 23 is arranged in the hydraulic box 226, and a support plate with a contact sensor is arranged at the movable end of the adjustable electric telescopic rod 229. A hydraulic telescopic rod 228 is arranged on the side of the adjustable electric telescopic rod 229, and a matching sensor is arranged at the movable end of the hydraulic telescopic rod 228. The hydraulic telescopic rod 228 and the hydraulic box 226 are connected by a third connecting pipe 227, and the movable plate 225 and the placement rack 13 are connected by a first electric telescopic rod 223. The inner diameter of the extruded elastic liquid bag 224 is twice the inner diameter of the fixed end of the hydraulic telescopic rod 228.

[0025] Specifically, the outer diameter of the deflection plate 222 is greater than the outer diameter of the movable plate 225 , and the placement frame 13 is provided with a stepped groove for use with the deflection plate 222 and the movable plate 225 .

[0026] During operation, the deflection plate 222 can enter the placement rack 13, and after entering the placement rack 13, the angle of the deflection plate 222 returns to normal, driving the gate plate processing surface to be an inclined surface.

[0027] Specifically, the liquid flow switching assembly 23 includes two connecting plates 235, a guide column 231 is arranged between the two connecting plates 235, a sealing plate 233 is slidably arranged on the guide column 231, and a blocking block 234 is arranged at the bottom of the sealing plate 233 for use in conjunction with the flow hole of the third connecting pipe 227, and an elastic damper 232 is arranged between the sealing plate 233 and the connecting plate 235.

[0028] Specifically, the connecting plate 235 is connected to the side wall of the hydraulic box 226 , the outer diameter of the sealing plate 233 is the same as the inner diameter of the hydraulic box 226 , and the outer diameter of the connecting plate 235 is smaller than the outer diameter of the sealing plate 233 .

[0029] Specifically, the depth of the stepped groove on the placement rack 13 is the same as the sum of the heights of the movable plate 225 and the deflection plate 222 .

[0030] During operation, the deflection plate 222 and the movable plate 225 can completely enter the stepped groove, so that the deflection plate 222 and the movable plate 225 are transformed into a horizontal state.

[0031] Specifically, the locking assembly 21 includes a rotating shaft 212 and a clamping base 215, and rotating blocks 211 are arranged on the inner sides of both ends of the clamping base 215. The rotating shaft 212 is arranged on both sides of the bottom end of the clamp frame 1, and the rotating block 211 is located in the rotating shaft 212. The rotating shaft 212 is provided with a limiting block 214, and the limiting block 214 and the rotating shaft 212 are connected by a spring guide column 231. A guide limit rod 213 is arranged next to the spring guide column 231, and the guide limit rod 213 penetrates the limiting block 214. A first hydraulic chamber is arranged on the stepped groove in the placement frame 13, and a first extrusion block 216 is arranged in the first extrusion chamber, and a first connecting pipe 217 is arranged between the first extrusion chamber and the rotating shaft 212.

[0032] Specifically, the contact surface between the limiting block 214 and the rotating block 211 is a friction surface.

[0033] During operation, the limiting block 214 contacts the rotating block 211 , thereby limiting the rotation of the rotating shaft 212 .

[0034] Working principle: When in use, place the gate plate horizontally on the deflection plate 222. Since the processing surface of the gate plate is an inclined surface, one end is limited to contact with the deflection plate 222. At this time, the deflection plate 222 deflects under the action of pressure until the other end of the deflection plate 222 also contacts with the gate plate (so that the deflection angle of the deflection plate 222 is the same as the angle of the inclined surface of the gate plate, which means that there is no restriction on the angle of the gate plate, so that the processing surfaces of the gate plates with different inclined angles can be judged). When the deflection plate 222 deflects (at this time, the deflection plate 222 and the movable plate 225 are like a seesaw, with a gap between one side larger and the other side smaller), the deflection plate 222 will squeeze the extrusion elastic liquid capsule 224 therein, so that the liquid therein passes through the first The second connecting pipe 221 enters the hydraulic box 226, and then squeezes the block 234 to make it move to the other side (although the hydraulic box 226 is filled with oil at this time, the hydraulic elastic liquid bag mentioned above becomes larger on one side and smaller on the other side, so that the space on the opposite side of the squeeze is also enlarged, so that the block 234 will not be affected by the oil on the opposite side of the movement, so that it can be displaced). At this time, the flow hole of the third connecting pipe 227 is opened, and the liquid enters the hydraulic telescopic rod 228 through the third connecting pipe 227. Since the inner diameter of the hydraulic elastic liquid bag is twice the inner diameter of the hydraulic telescopic rod 228, the liquid squeezed into the hydraulic telescopic rod 228 will make the height of the hydraulic telescopic rod 228 twice the height of the hydraulic elastic liquid bag (thereby adjusting the electric telescopic rod 229 to drive the clamp When the angle of the fixture frame 1 changes, the change angle is twice the angle of the single-side inclined surface of the gate plate) At this time, the movable end of the hydraulic telescopic rod 228 drives the matching sensor to move downward, and the contact sensor of the movable end of the electric telescopic rod 229 is adjusted to not contact the matching sensor. At this time, the movable end of the electric telescopic rod 229 is adjusted to extend until the matching sensor contacts the contact sensor. When the electric telescopic rod 229 is extended, the fixture frame 1 will be tilted at an angle. As the gate plate continues to move downward, the movable block and the deflection block will enter the stepped groove. At this time, the movable block contacts the stepped groove, and the movable plate 225 gradually changes to a horizontal state, thereby driving the gate plate to change (at this time, the gate plate is placed on the normal fixture plane, and the processing surface of the gate plate is inclined When the movable plate 225 moves to a certain position, the movable plate 225 squeezes the first squeezing block 216, so that the liquid in the first squeezing chamber enters the rotating shaft 212 through the first connecting pipe 217, so that the limiting block 214 in the rotating shaft 212 is displaced, and the limiting block 214 contacts the rotating block 211. At this time, the rotating block 211 is restricted so that it can no longer deflect (that is, the gate is placed in place, the angle adjustment of the clamp frame 1 is completed, and the clamp frame 1 cannot deflect, ensuring the clamping stability), and then the gate is clamped by the electric telescopic rod through the clamping block 11 displacement. When the processing is completed, the clamping of the clamping block 11 is contacted at this time, and then the first electric telescopic rod 223 is controlled to push the movable plate 225 and the deflection plate 222 out,At this time, the gate is removed, and the deflection plate 222 squeezes the elastic liquid capsule 224 and the rotating torsion spring shaft set therein to reset, and the hydraulically moved liquid is also reset, and the electric telescopic rod 229 is controlled and adjusted to return to the initial position, which is convenient for limiting gates of different models. If they are of the same model, the position of the electric telescopic rod 229 is not controlled and adjusted.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A grinding gate clamp, comprising a clamp frame (1), characterized in that: It also includes a movable clamping block (11) for clamping the gate plate, a limit block (12) for cooperating with the clamping block (11) to clamp the gate plate, a placement frame (13) for limiting the height of the gate plate, and an angle self-adjusting locking mechanism (2) for making the processing plane of gate plates with different angles inclined after clamping a horizontal plane, wherein the angle self-adjusting locking mechanism (2) includes an angle self-adjusting component (22) for detecting the inclined surface of the gate plate and then adjusting the angle of the clamp frame (1), and a locking component (21) for automatically locking the clamp frame (1).

2. A grinding gate fixture according to claim 1, characterized in that; The angle self-adaptive adjustment component (22) comprises a movable plate (225) arranged on the placement frame (13) and an adjustable electric telescopic rod (229) arranged at one end of the clamp frame (1); a deflection plate (222) is arranged above the movable plate (225); the deflection plate (222) and the movable plate (225) are connected by a rotating torsion spring shaft to deflect the deflection plate; two extrusion elastic liquid capsules (224) are arranged between the deflection plate (222) and the movable plate (225); a hydraulic box (226) is arranged on the side of the placement frame (13); the extrusion elastic liquid capsules (224) are connected by a second connecting pipe (221), and the two extrusion elastic liquid capsules (224) are connected by a second connecting pipe (221). The second connecting pipes (221) are respectively located at the two ends of the hydraulic box (226); a liquid flow switching assembly (23) is arranged in the hydraulic box (226); a support plate with a contact sensor is arranged at the movable end of the adjustable electric telescopic rod (229); a hydraulic telescopic rod (228) is arranged on the side of the adjustable electric telescopic rod (229); a matching sensor is arranged at the movable end of the hydraulic telescopic rod (228); a third connecting pipe (227) is connected between the hydraulic telescopic rod (228) and the hydraulic box (226); and the movable plate (225) and the placement rack (13) are connected via the first electric telescopic rod (223).

3. A grinding gate fixture according to claim 2, characterized in that; The outer diameter of the deflection plate (222) is greater than the outer diameter of the movable plate (225); the placement frame (13) is provided with a stepped groove for use with the deflection plate (222) and the movable plate (225); and the inner diameter of the extrusion elastic liquid bag (224) is twice the inner diameter of the fixed end of the hydraulic telescopic rod (228).

4. A grinding gate fixture according to claim 2, characterized in that; The liquid flow switching assembly (23) comprises two connecting plates (235), a guide column (231) is arranged between the two connecting plates (235), a sealing plate (233) is slidably arranged on the guide column (231), and a blocking block (234) is arranged at the bottom of the sealing plate (233) for use with the flow hole of the third connecting pipe (227), and an elastic damper (232) is arranged between the sealing plate (233) and the connecting plate (235).

5. A grinding gate fixture according to claim 4, characterized in that; The connecting plate (235) is connected to the side wall of the hydraulic box (226); the outer diameter of the sealing plate (233) is the same as the inner diameter of the hydraulic box (226); and the outer diameter of the connecting plate (235) is smaller than the outer diameter of the sealing plate (233).

6. A grinding gate fixture according to claim 2, characterized in that; The depth of the stepped groove on the placement rack (13) is the same as the sum of the heights of the movable plate (225) and the deflection plate (222).

7. A grinding gate fixture according to claim 1, characterized in that; The locking assembly (21) comprises a rotating shaft (212) and a clamping base (215), wherein rotating blocks (211) are arranged on the inner sides of both ends of the clamping base (215), wherein the rotating shaft (212) is arranged on both sides of the bottom end of the clamp frame (1), wherein the rotating blocks (211) are located inside the rotating shaft (212), wherein the rotating shaft (212) is provided with a limiting block (214), wherein the limiting block (214) and the rotating shaft (212) are connected via a spring guide column (231), wherein a guide limiting rod (213) is arranged beside the spring guide column (231), and wherein the guide limiting rod (213) penetrates the limiting block (214), wherein a first hydraulic chamber is arranged on the stepped groove in the placing frame (13), wherein a first extrusion block (216) is arranged in the first extrusion chamber, and wherein a first connecting pipe (217) is arranged between the first extrusion chamber and the rotating shaft (212).

8. A grinding gate fixture according to claim 7, characterized in that; The contact surface between the limiting block (214) and the rotating block (211) is a friction surface.

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