A tool for detecting the roundness of the cylinder body of a compressor

Abstract

The utility model discloses a compressor cylinder body roundness detection tool, including: a frame; a accommodating fixed unit, which is arranged on the frame, and the upper surface is provided with a limiting groove for limiting the compressor cylinder body; the limiting groove can rotate along the axis of the placed compressor cylinder body; a moving unit, which is arranged on the frame, and the movable end can move along the vertical direction and horizontal direction of the frame; a detection fixed seat, which is arranged on the moving end of the moving unit; a plurality of top pressure detection components, which are arranged in parallel on the detection fixed seat, directly above the limiting groove of the accommodating fixed unit; the top pressure detection component is elastically slidably connected with the detection fixed seat; a pressure collection component, which is arranged on the moving end of the moving unit, located directly behind the top pressure detection component, and abuts against the top pressure detection component. The utility model can quickly detect most areas of the compressor cylinder body outer surface, and the detection result can be combined with the software to obtain the detection result in real time and quickly.

Description

Technical Field

[0001] The utility model relates to the field of appearance detection, in particular to a compressor cylinder body appearance roundness detection tool. Background Art

[0002] The compressor cylinder is a barrel-shaped structure, which contains compressor parts inside and is installed outside. The roundness of the compressor cylinder must meet certain requirements to ensure its appearance product quality and installation requirements. The current cylinder external roundness detection uses a single-point winding test, so the detection surface range is limited, resulting in low accuracy of the test results. At the same time, whether the roundness requirements are met requires manual naked eye or inspection by inspection tools, which has low detection efficiency. Utility Model Content

[0003] In view of the above-mentioned defects of the prior art, the purpose of the utility model is to provide a compressor cylinder body roundness detection tool, which can quickly detect most areas of the compressor cylinder body surface. The detection results can be combined with software to obtain the detection results in real time and quickly, and the results can be saved for traceability.

[0004] The purpose of the utility model is achieved through such technical solution:

[0005] A compressor cylinder body roundness detection tool, comprising:

[0006] frame;

[0007] The accommodating fixing unit is arranged on the frame, and a limiting groove for limiting the position of the compressor cylinder is arranged on the upper surface; the limiting groove can rotate along the axis of the placed compressor cylinder;

[0008] The mobile unit is arranged on the frame, and the movable end can move along the vertical direction and the horizontal direction of the frame;

[0009] A detection fixing seat is arranged on the moving end of the moving unit;

[0010] A plurality of top pressure detection components are arranged in parallel on the detection fixing seat, directly above the limit groove accommodating the fixing unit; the top pressure detection components are elastically slidably connected to the detection fixing seat;

[0011] The pressure collecting component is arranged on the moving end of the moving unit, is located directly behind the top pressure detecting component, and is against the top pressure detecting component.

[0012] Furthermore, the detection fixing seat comprises:

[0013] The right seat is fixedly arranged on the moving end of the moving unit; the side of the right seat facing the pressure collection component is provided with right grooves having the same number as the top pressure detection components, and a plurality of the right grooves are arranged in a row at intervals; a right sliding hole is provided in the right groove which runs horizontally through;

[0014] The left seat is fixedly arranged on the moving end of the moving unit; the left seat is provided with left grooves having the same number as the top pressure detection components on the side surface directly above the limiting groove for accommodating the fixed unit, and a plurality of the right grooves are arranged in a row at intervals; a left sliding hole is provided in the left groove which passes through horizontally;

[0015] The left groove on the left seat corresponds horizontally to the right groove on the right seat one by one; the right seat and the left seat are tightly fixed, and the left groove and the right groove form a closed accommodating cavity;

[0016] The corresponding left sliding hole and right sliding hole in the accommodating cavity are axially collinear;

[0017] The end of the top pressure detection component passes through the left sliding hole, the accommodating cavity, and the right sliding hole in sequence, and faces the pressure collection component.

[0018] Furthermore, the top pressure detection component comprises:

[0019] The detection head rod has a tail end passing through the right sliding hole and located in the right groove, and a head end located outside the right seat, directly above the limiting groove accommodating the fixing unit; the cylindrical surface of the detection head rod fits with the right sliding hole;

[0020] The tail rod of the detection rod has its tail end passing through the left sliding hole and facing the pressure collection assembly, and its head end is located in the left groove and facing the tail end of the head rod of the detection rod; the cylindrical surface of the tail rod of the detection rod is fitted with the left sliding hole;

[0021] The spring is located in the accommodating cavity, and its two ends are respectively connected with the tail end of the detection head rod and the head end of the detection tail rod.

[0022] Furthermore, a limiting convex ring is provided on the outer side of the tail of the detection head rod and the head of the detection tail rod; the two ends of the spring are respectively sleeved on the outer surface of the tail of the detection head rod and the head of the detection tail rod, and are connected to the limiting convex ring on the tail of the detection head rod and the limiting convex ring on the outer side of the head of the detection tail rod.

[0023] Furthermore, the head end of the detection head rod and the tail end of the detection tail rod are both provided with wear-resistant materials.

[0024] Furthermore, the pressure collection assembly comprises:

[0025] A collecting seat, fixedly arranged on the moving end of the moving unit;

[0026] A plurality of pressure sensors are arranged on the side of the collecting seat, facing the tail ends of all the detection tail rods one by one.

[0027] Furthermore, a reset unit is included, and the reset unit includes:

[0028] The reset electric cylinder is arranged on the upper end surface of the right seat, and its axis is parallel to the detection head rod;

[0029] The L-shaped reset rod has a head end connected to the telescopic end of the reset electric cylinder and a tail end perpendicular to the axis of the detection head rod; a reset protrusion is provided on the detection head rod; the tail end of the reset rod is located between the reset protrusion and the head end of the detection head rod, and as the reset electric cylinder is controlled to abut against the reset protrusion, the detection head rod is limited in movement to the top of the limit groove that accommodates the fixed unit.

[0030] Furthermore, the mobile unit comprises:

[0031] A vertical lifting assembly is arranged on the frame;

[0032] The horizontal displacement component is arranged on the lifting end of the vertical lifting mechanism; the detection fixing seat and the pressure collection component are arranged on the moving end of the horizontal displacement component.

[0033] Furthermore, the accommodating and fixing unit includes:

[0034] The receiving seat is arranged on the frame, and the upper surface is provided with a stepped receiving groove, and the bottom of the receiving groove is provided with a coaxial through hole;

[0035] The pressure bearing is arranged in the receiving groove, and the lower plate is fixedly connected to the lower hole of the receiving groove;

[0036] The slewing bearing is sleeved on the upper plate of the pressure bearing and fixedly connected with the upper hole of the receiving groove;

[0037] A limit seat is arranged on the upper surface of the upper plate of the pressure bearing, and a limit groove for limiting the cylinder body of the compressor is arranged on the upper surface;

[0038] The servo motor is vertically arranged on the frame, and the rotating shaft passes through the through hole and is coaxially connected with the upper plate of the pressure bearing.

[0039] Furthermore, the accommodating and fixing unit further includes:

[0040] The extrusion motor is arranged vertically downward on the frame and directly opposite to the limit seat;

[0041] The extrusion seat is arranged on the lifting end of the extrusion motor; the extrusion seat can rotate around the rotating shaft of the servo motor.

[0042] Due to the adoption of the above technical solution, the utility model has the following advantages:

[0043] 1. By setting more top pressure detection components, more detection points can be used to detect the outer surface of the compressor cylinder body, and the detection results are more precise and accurate.

[0044] 2. By setting up the mobile unit, the top pressure detection component can be driven to perform spiral detection in more areas of the outer surface of the compressor cylinder body, thereby ensuring that a sufficient area is detected and improving the quality of the shape roundness detection.

[0045] 3. The detection method is combined with the pressure collection component through the top pressure detection component, and the change of the compressor cylinder shape is reflected by the change of the pressure value. The intuitive numerical expression of the roundness of the compressor cylinder shape is realized through data reception and display, which reduces the error of manual detection, improves the detection accuracy, and the data can be traced.

[0046] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and study, or may be taught from the practice of the present invention to some extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings of the present utility model are as follows:

[0048] Figure 1 It is a front view schematic diagram of the compressor cylinder body roundness detection tool in this embodiment.

[0049] Figure 2 for Figure 1 Enlarged structural diagram at A in the middle.

[0050] Figure 3 Schematic diagram of top view of the compressor cylinder body roundness detection tool in this embodiment.

[0051] Figure 4 for Figure 3 Enlarged structural diagram at B in the middle.

[0052] Figure 5 It is a schematic cross-sectional structural diagram of the detection fixing seat, the top pressure detection assembly, the pressure collection assembly, and the reset unit in this embodiment.

[0053] Figure 6 for Figure 5 Enlarged structural diagram at point C in the middle.

[0054] In the figure: 1. frame; 21. accommodating seat; 211. accommodating groove; 212. perforation; 22. pressure bearing; 23. slewing bearing; 24. limit seat; 241. limit groove; 25. servo motor; 26. extrusion motor; 27. extrusion seat; 31. vertical lifting assembly; 32. horizontal displacement assembly; 41. right seat; 411. right groove; 412. right sliding hole; 42. left seat; 421. left groove; 422. left sliding hole; 43. accommodating cavity; 51. detection head rod; 52. detection tail rod; 53. spring; 54. limit convex ring; 55. wear-resistant material; 61. collection seat; 62. pressure sensor; 71. reset electric cylinder; 72. reset rod; 73. reset protrusion; 8. compressor cylinder. DETAILED DESCRIPTION

[0055] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0056] Example:

[0057] like Figures 1 to 6 As shown, the compressor cylinder 8 roundness detection tool includes:

[0058] Rack 1;

[0059] The accommodating fixing unit is arranged on the frame 1, and a limiting groove 241 for limiting the compressor cylinder 8 is provided on the upper surface; the limiting groove 241 can rotate along the axis of the placed compressor cylinder 8;

[0060] The mobile unit is arranged on the frame 1, and the movable end can move along the vertical direction and the horizontal direction of the frame 1;

[0061] A detection fixing seat is arranged on the moving end of the moving unit;

[0062] A plurality of top pressure detection components are arranged in parallel on the detection fixing seat, directly above the limiting groove 241 of the accommodating fixing unit; the top pressure detection components are elastically slidably connected to the detection fixing seat;

[0063] The pressure collecting component is arranged on the moving end of the moving unit, is located directly behind the top pressure detecting component, and is against the top pressure detecting component.

[0064] By setting more top pressure detection components, more detection points can be used to detect the outer surface of the compressor cylinder 8, and the detection results are more precise and accurate. By setting a mobile unit, the top pressure detection component can be driven to perform spiral detection in more areas of the outer surface of the compressor cylinder 8, thereby ensuring that sufficient areas are detected and improving the quality of the appearance roundness detection. The detection method is combined with the pressure collection component through the top pressure detection component, and the changes in the appearance of the compressor cylinder 8 are reflected through the changes in the pressure value. The intuitive numerical expression of the roundness of the compressor cylinder 8 is achieved through data reception and display, reducing the error of manual detection, improving the detection accuracy, and the data can be traced.

[0065] In this example, the detection fixing seat includes:

[0066] The right seat 41 is fixedly arranged on the moving end of the moving unit; the side of the right seat 41 facing the pressure collection component is provided with right grooves 411 having the same number as the top pressure detection components, and a plurality of the right grooves 411 are arranged in a row at intervals; a right sliding hole 412 is horizontally penetrated in the right groove 411;

[0067] The left seat 42 is fixedly arranged on the moving end of the moving unit; the left seat 42 is provided with a left groove 421 having the same number as the top pressure detection components on the side directly above the limiting groove 241 for accommodating the fixed unit, and a plurality of the right grooves 411 are arranged in a row at intervals; a left sliding hole 422 is provided in the left groove 421 and runs horizontally therethrough;

[0068] The left groove 421 on the left seat 42 corresponds horizontally to the right groove 411 on the right seat 41 one by one; the right seat 41 and the left seat 42 are tightly fixed, and the left groove 421 and the right groove 411 form a closed accommodating cavity 43;

[0069] The corresponding left sliding hole 422 and right sliding hole 412 in the accommodating cavity 43 are axially collinear;

[0070] The end of the top pressure detection component passes through the left sliding hole 422, the accommodating cavity 43, and the right sliding hole 412 in sequence, and faces the pressure collection component.

[0071] By limiting the sliding position of the top pressure detection component, the top pressure detection component and the outer surface of the compressor cylinder 8 are pressed relative to each other, thereby generating pressure to act on the pressure collection component.

[0072] In this embodiment, the top pressure detection component includes:

[0073] The detection head rod 51 has its tail end passing through the right sliding hole 412 and located in the right groove 411, and its head end is located outside the right seat 41, directly above the limiting groove 241 accommodating the fixing unit; the cylindrical surface of the detection head rod 51 fits with the right sliding hole 412;

[0074] The tail end of the detection tail rod 52 passes through the left sliding hole 422 and faces the pressure collection component, and the head end is located in the left groove 421 and faces the tail end of the detection head rod; the cylindrical surface of the detection tail rod 52 fits with the left sliding hole 422;

[0075] The spring 53 is located in the accommodating cavity 43 , and its two ends are respectively connected to the tail end of the detection head rod 51 and the head end of the detection tail rod 52 .

[0076] The displacement of mutual squeezing is converted into pressure through the spring 53. At the same time, the spring 53 is sealed and protected by the left groove 421 and the right groove 411, and its elastic coefficient can be kept stable, that is, the pressure value can maintain a stable functional relationship with the displacement of the detection head rod 51.

[0077] In this embodiment, a limiting convex ring 54 is provided on the outer side of the tail of the detection head rod 51 and the head of the detection tail rod 52; the two ends of the spring 53 are respectively sleeved on the outer surface of the tail of the detection head rod 51 and the head of the detection tail rod 52, and are connected to the limiting convex ring 54 on the tail of the detection head rod 51 and the limiting convex ring 54 on the outer side of the head of the detection tail rod 52.

[0078] The limiting convex ring 54 can effectively limit the spring 53 and limit the displacement of the detection head rod 51 and the detection tail rod 52, thereby preventing the detection head rod 51 and the detection tail rod 52 from being separated from the detection fixing seat.

[0079] In this embodiment, the head end of the detection head rod 51 and the tail end of the detection tail rod 52 are both provided with wear-resistant material 55 .

[0080] The wear-resistant material 55 can be made of a material with high hardness, such as a special alloy or ruby.

[0081] In this embodiment, the pressure collection component includes:

[0082] A collecting seat 61 is fixedly arranged on the moving end of the moving unit;

[0083] A plurality of pressure sensors 62 are disposed on the side of the collecting seat 61 , facing the tail ends of all the detection tail rods 52 one by one.

[0084] In this embodiment, a reset unit is further included, and the reset unit includes:

[0085] The reset electric cylinder 71 is arranged on the upper end surface of the right seat 41, and its axis is parallel to the detection head rod 51;

[0086] The L-shaped reset rod 72 has a head end connected to the telescopic end of the reset electric cylinder 71, and a tail end perpendicular to the axis of the detection head rod 51; the detection head rod 51 is provided with a reset protrusion 73; the tail end of the reset rod 72 is located between the reset protrusion 73 and the head end of the detection head rod 51, and as the control of the reset electric cylinder 71 abuts against the reset protrusion 73, the detection head rod 51 is limited in movement to the top of the limit groove 241 that accommodates the fixed unit.

[0087] The reset rod 72 is used to reset the head ends of all the detection head rods 51 to be consistent, and compress the spring 53 (the deformed concave spring 53 can also act to make the detection head rod 51 extend outward), and at the same time, the value of the pressure sensor 62 can be defined as 0 in the next state.

[0088] In this embodiment, the mobile unit includes:

[0089] A vertical lifting assembly 31 is arranged on the frame 1;

[0090] The horizontal displacement component 32 is arranged on the lifting end of the vertical lifting mechanism; the detection fixing seat and the pressure collection component are arranged on the moving end of the horizontal displacement component 32.

[0091] The vertical lifting assembly 31 adopts a cylinder structure, and the horizontal displacement assembly 32 adopts a screw structure.

[0092] In this embodiment, the accommodating and fixing unit includes:

[0093] The receiving seat 21 is arranged on the frame 1, and a stepped receiving groove 211 is provided on the upper surface, and a coaxial through hole 212 is provided at the bottom of the receiving groove 211;

[0094] The pressure bearing 22 is disposed in the receiving groove 211, and the lower plate is fixedly connected to the lower hole of the receiving groove 211;

[0095] The slewing bearing 23 is sleeved on the upper plate of the pressure bearing 22 and fixedly connected to the upper hole of the receiving groove 211;

[0096] The limiting seat 24 is arranged on the upper surface of the upper plate of the pressure bearing 22, and the upper surface is provided with a limiting groove 241 for limiting the compressor cylinder 8;

[0097] The servo motor 25 is vertically arranged on the frame 1 , and its rotating shaft passes through the through hole 212 and is coaxially connected to the upper plate of the pressure bearing 22 .

[0098] The pressure bearing 22 , the slewing bearing 23 and other structures ensure that the limiting seat 24 on the accommodating seat 21 can rotate stably.

[0099] In this embodiment, the accommodating and fixing unit further includes:

[0100] The extrusion motor 26 is vertically downwardly arranged on the frame 1 and directly faces the limit seat 24;

[0101] The extrusion seat 27 is arranged on the lifting end of the extrusion motor 26; the extrusion seat 27 can rotate around the rotating shaft of the servo motor 25. The connection between the extrusion seat 27 and the pressurizing motor adopts a rotating connection mode, and the connection point is colinear with the rotating shaft of the servo motor 25.

[0102] The roundness detection tool for the compressor cylinder body 8 of this embodiment is used as follows: the workpiece to be detected is placed in the limit groove 241, the extrusion motor 26 is started to extend, and the extrusion seat 27 squeezes the upper end of the compressor cylinder body 8 downward.

[0103] The control reset electric cylinder 71 is shortened, so that all the detection head rods 51 are retracted and kept consistent. At this time, the detection tail rod 52 is against the pressure sensor 62, and the value received by the pressure sensor 62 is reset to 0.

[0104] Control the horizontal displacement assembly 32 to move the detection head rod 51 toward the surface of the compressor cylinder 8 until the detection end of the detection head rod 51 reaches a predetermined position (theoretically, the detection end of the detection head rod 51 just contacts the surface of the compressor cylinder 8).

[0105] The control reset electric cylinder 71 is extended to release the restriction on the displacement of the detection head rod 51. At this time, the detection head rod 51 contacts and squeezes the surface of the compressor cylinder 8, thereby squeezing the pressure sensor 62, and the pressure sensor 62 imports the received value into the computer to form data.

[0106] The servo motor 25 is controlled to rotate, and the compressor cylinder 8 is tested in one circle. The vertical lifting assembly 31 is synchronously controlled to rise, so that the detection head rod 51 is raised to complete the spiral detection. The detection data is continuous data, and the detection software automatically determines whether the detected product is qualified.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A compressor cylinder body roundness detection tool, characterized in that: include: frame; The accommodating fixing unit is arranged on the frame, and a limiting groove for limiting the position of the compressor cylinder is arranged on the upper surface; the limiting groove can rotate along the axis of the placed compressor cylinder; The mobile unit is arranged on the frame, and the movable end can move along the vertical direction and the horizontal direction of the frame; A detection fixing seat is arranged on the moving end of the moving unit; A plurality of top pressure detection components are arranged in parallel on the detection fixing seat, directly above the limit groove accommodating the fixing unit; the top pressure detection components are elastically slidably connected to the detection fixing seat; The pressure collecting component is arranged on the moving end of the moving unit, is located directly behind the top pressure detecting component, and is against the top pressure detecting component.

2. The compressor cylinder body roundness detection tool according to claim 1, characterized in that: The detection fixing seat comprises: The right seat is fixedly arranged on the moving end of the moving unit; the side of the right seat facing the pressure collection component is provided with right grooves having the same number as the top pressure detection components, and a plurality of the right grooves are arranged in a row at intervals; a right sliding hole is provided in the right groove which runs horizontally through; The left seat is fixedly arranged on the moving end of the moving unit; the left seat is provided with left grooves having the same number as the top pressure detection components on the side surface directly above the limiting groove for accommodating the fixed unit, and a plurality of the right grooves are arranged in a row at intervals; a left sliding hole is provided in the left groove which passes through horizontally; The left groove on the left seat corresponds horizontally to the right groove on the right seat one by one; the right seat and the left seat are tightly fixed, and the left groove and the right groove form a closed accommodating cavity; The corresponding left sliding hole and right sliding hole in the accommodating cavity are axially collinear; The end of the top pressure detection component passes through the left sliding hole, the accommodating cavity, and the right sliding hole in sequence, and faces the pressure collection component.

3. The compressor cylinder body roundness detection tool according to claim 2, characterized in that: The top pressure detection component comprises: The detection head rod has a tail end passing through the right sliding hole and located in the right groove, and a head end located outside the right seat, directly above the limiting groove accommodating the fixing unit; the cylindrical surface of the detection head rod fits with the right sliding hole; The tail rod of the detection rod has its tail end passing through the left sliding hole and facing the pressure collection assembly, and its head end is located in the left groove and facing the tail end of the head rod of the detection rod; the cylindrical surface of the tail rod of the detection rod is fitted with the left sliding hole; The spring is located in the accommodating cavity, and its two ends are respectively connected with the tail end of the detection head rod and the head end of the detection tail rod.

4. The compressor cylinder body roundness detection tool according to claim 3 is characterized in that: The tail of the detection head rod and the outer side of the head of the detection tail rod are both provided with limiting convex rings; the two ends of the spring are respectively sleeved on the outer surfaces of the tail of the detection head rod and the head of the detection tail rod, and are connected with the limiting convex ring on the tail of the detection head rod and the limiting convex ring on the outer side of the head of the detection tail rod.

5. The compressor cylinder body roundness detection tool according to claim 3, characterized in that: The head end of the detection head rod and the tail end of the detection tail rod are both provided with wear-resistant materials.

6. The compressor cylinder body roundness detection tool according to claim 3, characterized in that: The pressure collection assembly comprises: A collecting seat, fixedly arranged on the moving end of the moving unit; A plurality of pressure sensors are arranged on the side of the collecting seat, facing the tail ends of all the detection tail rods one by one.

7. The compressor cylinder body roundness detection tool according to claim 3, characterized in that: Also included is a reset unit, the reset unit comprising: The reset electric cylinder is arranged on the upper end surface of the right seat, and its axis is parallel to the detection head rod; The L-shaped reset rod has a head end connected to the telescopic end of the reset electric cylinder and a tail end perpendicular to the axis of the detection head rod; a reset protrusion is provided on the detection head rod; the tail end of the reset rod is located between the reset protrusion and the head end of the detection head rod, and as the reset electric cylinder is controlled to abut against the reset protrusion, the detection head rod is limited in movement to the top of the limit groove that accommodates the fixed unit.

8. The compressor cylinder body roundness detection tool according to claim 3, characterized in that: The mobile unit comprises: A vertical lifting assembly is arranged on the frame; The horizontal displacement component is arranged on the lifting end of the vertical lifting mechanism; the detection fixing seat and the pressure collection component are arranged on the moving end of the horizontal displacement component.

9. The compressor cylinder body roundness detection tool according to claim 1, characterized in that: The accommodating and fixing unit comprises: The receiving seat is arranged on the frame, and the upper surface is provided with a stepped receiving groove, and the bottom of the receiving groove is provided with a coaxial through hole; The pressure bearing is arranged in the receiving groove, and the lower plate is fixedly connected to the lower hole of the receiving groove; The slewing bearing is sleeved on the upper plate of the pressure bearing and fixedly connected with the upper hole of the receiving groove; A limit seat is arranged on the upper surface of the upper plate of the pressure bearing, and a limit groove for limiting the cylinder body of the compressor is arranged on the upper surface; The servo motor is vertically arranged on the frame, and the rotating shaft passes through the through hole and is coaxially connected with the upper plate of the pressure bearing.

10. The compressor cylinder body roundness detection tool according to claim 9, characterized in that: The accommodating and fixing unit further includes: The extrusion motor is arranged vertically downward on the frame and directly opposite to the limit seat; The extrusion seat is arranged on the lifting end of the extrusion motor; the extrusion seat can rotate around the rotating shaft of the servo motor.

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