Solid state hard disk plug-in device

Abstract

The utility model discloses a solid state hard disk plug-in device, including a device body, a mounting plate, a material picking mechanism and an aging vehicle are arranged in the device body, the material picking mechanism includes a jig extraction assembly and a transplanting and lifting mechanism, the transplanting and lifting mechanism includes a lifting mechanism and a transverse movement mechanism, the jig extraction assembly can be installed on one side of the lifting mechanism so as to move up and down, the lifting mechanism can be installed on the transverse movement mechanism so as to move left and right, a material picking and code scanning mechanism and a material picking and plug-in mechanism are arranged on the mounting plate, the material picking and code scanning mechanism includes a first linear module, the first linear module is movably provided with a first clamping jaw that can rotate 90°, and a manipulator is rotatably arranged at the upper end of the material picking and plug-in mechanism. The technical solution of the utility model can realize automatic grasping of solid state hard disks for orderly insertion through the first clamping jaw and the manipulator that can rotate 90°, effectively improving efficiency and reducing labor costs, and can insert solid state hard disks of various specifications, improving practicality and expanding applicability.

Description

Technical Field

[0001] The utility model relates to the technical field of solid state hard disks, and in particular to a solid state hard disk plugging and unplugging device. Background Art

[0002] Solid State Drives (SSDs), abbreviated as SSDs, are hard disks made of solid-state electronic storage chip arrays. They are composed of a control unit and a storage unit (FLASH chip, DRAM chip). With the development of technology, SSDs are widely used in military, automotive, industrial control, video surveillance, network monitoring, network terminals, electricity, medical, aviation, navigation equipment and other fields.

[0003] However, solid-state hard disks are now more and more widely used in the market, and manual plugging and unplugging is generally used. The plugging and unplugging devices are cumbersome to use, the overall efficiency is low, and the labor cost is high. Utility Model Content

[0004] The main purpose of the utility model is to provide a solid state hard disk plugging and unplugging device, aiming to solve the technical problems of low efficiency and high labor cost in the existing manual plugging and unplugging of solid state hard disks.

[0005] To achieve the above-mentioned purpose, the solid-state hard disk plug-in and pull-out device proposed by the utility model includes a device body, wherein a mounting plate, a material picking mechanism and an aging vehicle are arranged in the device body, wherein the mounting plate is arranged on one side of the material picking mechanism, and the mounting plate and the material picking mechanism are arranged at intervals, and the aging vehicle can be movably connected to the other side of the material picking mechanism, the material picking mechanism includes a fixture extraction component and a transplanting and lifting mechanism, the transplanting and lifting mechanism includes a lifting mechanism and a transverse movement mechanism, the fixture extraction component can be movably installed on one side of the lifting mechanism up and down, and the lifting mechanism can be movably installed on the transverse movement mechanism left and right, a material bin part, a material picking and scanning mechanism and a material picking plug-in mechanism are arranged on the mounting plate, and the material picking and scanning mechanism includes a first linear module and a scanning module, the first linear module is arranged on the mounting plate along the vertical direction of the mounting plate, the first linear module is movably provided with a first clamping jaw which can rotate 90°, and the lower end portion of one side of the first linear module is embedded in the material bin part, and the first linear module The lower end of the other side of the group is spaced apart from the scanning module, the material picking plug-in mechanism is arranged along the horizontal direction of the mounting plate, one side of the material picking plug-in mechanism is indirectly connected to the scanning module, and the other side of the material picking plug-in mechanism is indirectly connected to the fixture extraction assembly, the upper end of the material picking plug-in mechanism is rotatably provided with a rotating arm, the upper end of the rotating arm is sleeved with a manipulator, the front end of the manipulator is movably provided with a moving shaft, the moving shaft penetrates the front end of the manipulator from top to bottom, the lower end of the moving shaft is provided with a clamping fixture, the material picking plug-in mechanism is provided with a positioning and correction camera, the positioning and correction camera is installed on the mounting plate, and the positioning and correction camera is located below the clamping fixture, the clamping fixture is sequentially equipped with a test fixture positioning camera and a plug-in mechanism from top to bottom, the plug-in mechanism includes a force sensor, a spring structure, a clamping cylinder and a clamping claw, and the force sensor, the spring structure, the clamping claw cylinder and the clamping claw are sequentially connected and fixed to the lower end of the moving shaft from top to bottom.

[0006] Optionally, the silo portion includes a base assembly, a full silo, an empty silo and a material collection position, and the full silo, the empty silo and the material collection position are arranged side by side in sequence at the upper end of the base assembly along the horizontal direction of the mounting plate, and the lower end of the base assembly is mounted on the mounting plate, and the lower end of one side of the first linear module is embedded in the base assembly and is spaced apart from the material collection position.

[0007] Optionally, the code scanning module includes a product fixture seat and a code scanning component, the product fixture seat is provided with a first main shaft, the top center of the first main shaft is provided with a first groove, the code scanning component includes a CMOS photosensor and a lens module, the center of the CMOS photosensor is provided with a second through hole, and the lens module, the second through hole and the first groove are spaced apart along the same straight line direction.

[0008] Optionally, the first main axis is symmetrically provided with cylinder assemblies, upper ends of the cylinder assemblies are respectively provided with fixing parts, and the fixing parts are arranged along the symmetrical direction of the first groove axis.

[0009] Optionally, the product fixture seat is provided with a vacuum adsorption mechanism, the vacuum adsorption mechanism is provided with a customized suction head, the customized suction head is provided with a suction head, the vacuum adsorption mechanism is compressibly embedded in the first groove, and the suction head is protruded outside the first groove.

[0010] Optionally, the cylinder assembly includes a horizontal pushing cylinder, a lifting cylinder and a fixed bracket, the horizontal pushing cylinder is respectively installed on the upper end of the lifting cylinder, the lower end of the lifting cylinder is respectively installed on the fixed bracket, and the fixed bracket is respectively symmetrically arranged on the first main shaft.

[0011] Optionally, a front end portion of the fixing portion is respectively provided with an arc-shaped groove, and the arc-shaped groove is respectively spaced apart from the first groove.

[0012] Optionally, a second groove is recessed on the top of the customized suction head along the horizontal direction of the first groove, a plurality of small holes are recessed on both sides of the inner wall of the second groove, and the length of the second groove is not greater than that of the first groove.

[0013] Optionally, a plurality of roller skates and a plurality of fixed feet are installed at the bottom of the device body.

[0014] Optionally, the aging vehicle is provided with a lifting mechanism, which is telescopically mounted on the bottom of the aging vehicle, a plurality of fixed columns are provided at the upper end of the lifting mechanism, a bottom plate is movably provided at the lower end of the aging vehicle, a plurality of fixed column holes are provided on the bottom surface of the bottom plate, the fixed columns are matched with the fixed column holes, and the fixed columns are embedded in the fixed column holes.

[0015] The technical solution of the utility model has the following beneficial effects: in the technical solution of the utility model, by setting fixed feet and pulleys, the whole device can be moved and carried; by setting a first linear module and a first clamping claw that can rotate 90 degrees, the solid-state hard disk can be automatically grasped and the position can be automatically adjusted, thereby improving work efficiency; by setting a CMOS photosensor and a lens module, the solid-state hard disk can be quickly checked for two-dimensional codes, effectively ensuring the accuracy and integrity of the solid-state hard disk; by setting a vacuum adsorption mechanism, a second groove and an arc groove, solid-state hard disks of different specifications can be fixed for two-dimensional code verification, thereby improving the practicality of the device and expanding the applicability of the device; by setting a rotatable manipulator, positioning and correction The camera and the plug-in fixture, the manipulator drives the plug-in fixture to grab the solid-state hard disk. The plug-in fixture uses a spring structure + force sensor to position and correct the grabbed solid-state hard disk, thereby ensuring the effectiveness of the plug-in process and accurately adjusting the position of the solid-state hard disk, thereby achieving accurate plug-in; by setting a lifting mechanism, a transverse mechanism and a fixture extraction component, the solid-state hard disk that has been positioned and corrected is inserted through the lifting mechanism and the transverse mechanism to adjust the fixture extraction component, thereby further improving work efficiency, avoiding damage to the solid-state hard disk caused by human factors, and effectively improving plug-in efficiency; by setting an aging car and a lifting mechanism, adjusting the height of the aging car, the plug-in can be quickly pushed into place, and it is convenient and quick to transport, further improving the practicality and convenience of the aging car. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 The overall structure of a solid state hard disk plug-in device according to an embodiment of the utility model is shown in FIG. Figure 1 ;

[0018] Figure 2 The overall structure of a solid state hard disk plug-in device according to an embodiment of the utility model is shown in FIG. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the internal structure of a solid state hard disk plug-in and pull-out device according to an embodiment of the utility model;

[0020] Figure 4 Another schematic diagram of the internal structure of a solid state hard disk plugging and unplugging device according to an embodiment of the utility model.

[0021] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0024] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0025] The utility model provides a solid state hard disk plugging and unplugging device.

[0026] like Figures 1 to 4 As shown, in one embodiment of the utility model, the solid state hard disk plugging and unplugging device includes a device body 100 and a movable aging vehicle 200. The device body 100 is provided with a mounting plate 300 and a material-retrieving mechanism. The mounting plate 300 is provided on one side of the material-retrieving mechanism, and the mounting plate 300 is spaced apart from the material-retrieving mechanism. The aging vehicle 200 can be movably connected to the other side of the material-retrieving mechanism. The aging vehicle 200 is also provided with a positioning mechanism, and the positioning mechanism is used to fix the aging vehicle 200 in the device, which is convenient for loading and transporting solid state hard disks. A safety grating is also installed on the top of the aging vehicle 200 to protect personnel and equipment from accidents. While preventing damage, it avoids squeezing of solid-state hard disks, realizes the combination of safety and automation, improves production efficiency and the safety of work processes, the aging cart 200 is provided with a lifting mechanism 210, and the lifting mechanism 210 is telescopically installed at the bottom of the aging cart 200, and a plurality of fixed columns are provided at the upper end of the lifting mechanism 210, and a bottom plate is movably provided at the lower end of the aging cart, and a plurality of fixed column holes are provided on the bottom surface of the bottom plate, and the fixed columns are matched with the fixed column holes, and the fixed columns are embedded in the fixed column holes. The bottom position of the aging cart 200 is lifted by the lifting mechanism 210, which is convenient for reloading solid-state hard disks and further improves the overall loading efficiency.

[0027] Specifically, the material taking mechanism includes a jig extraction assembly 410 and a transplanting and lifting mechanism 420, and the transplanting and lifting mechanism 420 includes a lifting mechanism 421 and a transverse movement mechanism 422. The jig extraction assembly 410 can be movably installed on one side of the lifting mechanism 421 up and down, and the lifting mechanism 421 can be movably installed on the transverse movement mechanism 422 left and right, so as to transfer the solid-state hard disk from the mounting plate to the jig extraction assembly. The jig extraction assembly 410 inserts the solid-state hard disk into the fixed aging vehicle 200 through the reciprocating movement of the transverse movement mechanism 422, thereby realizing mechanized operation as a whole, reducing labor costs and the probability of damage and misoperation of the solid-state hard disk caused by human factors.

[0028] Specifically, the mounting plate 300 is provided with a material bin portion, a material picking and scanning mechanism and a material picking plug-in mechanism, the material picking and scanning mechanism comprises a first linear module 310 and a scanning module, the first linear module is arranged along the vertical direction of the mounting plate 300, the first linear module 310 is movably provided with a first clamping jaw 311 which can rotate 90°, the lower end portion of one side of the first linear module 310 is embedded in the material bin portion, the lower end portion of the other side of the first linear module 310 is spaced apart from the scanning module, so as to facilitate the first clamping jaw 311 to pick up materials, the material picking plug-in mechanism is arranged along the horizontal direction of the mounting plate 300, one side of the material picking plug-in mechanism is indirectly connected to the scanning module, and the other side of the material picking plug-in mechanism is connected to the The fixture extraction component 410 is indirectly connected, and the upper end of the material picking plug-in mechanism is rotatably provided with a rotating arm (not shown in the figure), and the upper end of the rotating arm is sleeved with a manipulator (not shown in the figure), so that the manipulator can grab the solid-state hard disk. Automated operation reduces labor costs and improves work efficiency. The front end of the manipulator is movably provided with a moving shaft 320, and the moving shaft 320 passes through the front end of the manipulator from top to bottom. The lower end of the moving shaft 320 is provided with a clamping fixture, and the material picking plug-in mechanism is provided with a positioning and correction camera 301, which is installed on the mounting plate 300, and the positioning and correction camera 301 is located below the clamping fixture, and the clamping fixture is equipped with test fixtures in sequence from top to bottom. The positioning camera 330 and the plug-in mechanism include a force sensor 341, a spring structure 342, a clamping cylinder 343 and a clamping claw 344. The force sensor 341, the spring structure 342, the clamping claw cylinder 343 and the clamping claw 344 are sequentially connected and fixed to the lower end of the movable shaft 320 from top to bottom. The silo part includes a base assembly 351, a full tray silo 352, an empty tray silo 353 and a material fetching position 354. The full tray silo 352, the empty tray silo 353 and the material fetching position 354 are sequentially arranged side by side at the upper end of the base assembly 351 along the horizontal direction of the mounting plate 300. The lower end of the base assembly 351 is installed on the mounting plate 300. The lower end of one side of the first linear module 310 The end is embedded in the base component 351 and is spaced apart from the material taking position 354. The code scanning module includes a product fixture seat and a code scanning component. The product fixture seat is provided with a first spindle 361. The top center of the first spindle 361 is concave with a first groove 362. The code scanning component includes a CMOS photosensor 371 and a lens module 372. The center of the CMOS photosensor 371 is provided with a second through hole 373. The lens module 372, the second through hole 373 and the first groove 362 are spaced apart along the same straight line direction for scanning the identity QR code of the solid state drive. The first spindle 361 is symmetrically provided with cylinder assemblies 363. The upper ends of the cylinder assemblies 363 are respectively provided with fixing parts 364.The fixing portion 364 is arranged along the axis symmetrically of the first groove 362, the product fixture seat is provided with a vacuum adsorption mechanism 365, the vacuum adsorption mechanism 365 is provided with a customized suction head 366, the customized suction head is provided with a suction head 367, the vacuum adsorption mechanism 365 is compressibly embedded in the first groove 362, and the suction head 367 is convexly arranged outside the first groove 362, the cylinder assembly 363 includes a horizontal push cylinder 3631, a lifting cylinder 3632 and a fixed bracket 3633, the horizontal push cylinder 3631 is respectively installed on the upper end of the lifting cylinder 3632, the lower end of the lifting cylinder 3632 is respectively installed on the fixed bracket 3633, and the fixed bracket 3633 is respectively symmetrically arranged On the first main shaft 361, the front end of the fixing part 364 is respectively concavely provided with an arc groove 3641, and the arc groove 3641 is respectively arranged at intervals from the first groove 362, so as to facilitate the fixing of the solid state hard disk. The top of the customized suction head 366 is concavely provided with a second groove 3661 along the horizontal direction of the first groove 362, and the inner wall of the second groove 3661 is respectively concavely provided with a plurality of small holes on both sides, and the length of the second groove 3661 is not greater than the first groove 362. The second groove 3661 can be equipped with a solid state hard disk of another specification for code scanning, so as to improve the practicality and applicability of the device. The bottom of the device body 100 is equipped with a plurality of fixing feet 110 and a plurality of pulleys 120, so as to facilitate the fixing and movement of the device.

[0029] Specifically, the working principle and process of the utility model are as follows: the solid-state hard disk is manually put on the hopper part, the device automatically takes materials one by one, the first linear module operates, the solid-state hard disk is grabbed by the first clamp, and after rotating 90°, it is placed in the first groove or the second groove for fixing, and then the camera is scanned to confirm the solid-state hard disk information, the manipulator takes the solid-state hard disk for visual correction offset, the lifting mechanism and the transverse movement mechanism operate synchronously, and the jig extraction component is transferred to the range where the manipulator can place the solid-state hard disk. The manipulator instructs the plug-in mechanism to transplant the solid-state hard disk to the jig extraction component. After the jig extraction component is full of solid-state hard disks, the lifting mechanism and the transverse movement mechanism operate synchronously to transfer the jig extraction component to a fixed position on the aging vehicle. The jig extraction component operates to insert the solid-state hard disk into the aging vehicle. If the insertion position is too low, the lifting mechanism at the bottom of the aging vehicle operates to lift the inside of the aging vehicle to within the operating range of the jig extraction component.

[0030] The utility model has the following advantages:

[0031] By setting fixed feet and pulleys, the whole device can be moved and carried easily;

[0032] By providing a first linear module and a first clamping claw that can rotate 90 degrees, the solid state hard disk can be automatically grasped and the position can be automatically adjusted, thereby improving work efficiency;

[0033] By setting up CMOS photosensors and lens modules, the SSD QR code can be quickly checked to effectively ensure the accuracy and integrity of the SSD.

[0034] By providing the vacuum adsorption mechanism, the second groove and the arc groove, solid state hard disks of different specifications can be fixed for QR code verification, thereby improving the practicality of the device and expanding the applicability of the device;

[0035] By setting a rotatable manipulator, a positioning and correction camera, and a plug-in fixture, the manipulator drives the plug-in fixture to grab the solid-state hard disk. The plug-in fixture uses a spring structure + force sensor to position and correct the grabbed solid-state hard disk, thereby ensuring the effectiveness of the plug-in process and accurately adjusting the position of the solid-state hard disk, thereby achieving accurate plug-in;

[0036] By setting a lifting mechanism, a transverse movement mechanism and a jig extraction component, the solid-state hard disk after positioning and correction can be inserted through the lifting mechanism and the transverse movement mechanism to adjust the jig extraction component, thereby further improving work efficiency, avoiding damage to the solid-state hard disk due to human factors, and effectively improving insertion efficiency;

[0037] By providing an aging cart and a lifting mechanism, the height of the aging cart can be adjusted, the plug-in can be quickly pushed into place, and the transportation is convenient and fast, which further improves the practicality and convenience of the aging cart.

[0038] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A solid state hard disk plug-in and pull-out device, characterized in that: The loader is provided with a mounting plate, a material picking mechanism and an aging vehicle, wherein the mounting plate is provided on one side of the material picking mechanism, and the mounting plate and the material picking mechanism are spaced apart, and the aging vehicle can be movably connected to the other side of the material picking mechanism, and the material picking mechanism comprises a jig extraction assembly and a transplanting and lifting mechanism, and the transplanting and lifting mechanism comprises a lifting mechanism and a transverse movement mechanism, the jig extraction assembly can be movably installed on one side of the lifting mechanism up and down, and the lifting mechanism can be movably installed on the transverse movement mechanism left and right, a silo part, a material picking and scanning mechanism and a material picking plug-in mechanism are provided on the mounting plate, and the material picking and scanning mechanism comprises a first linear module and a scanning module, the first linear module is provided along the vertical direction of the mounting plate, the first linear module is movably provided with a first clamping jaw which can rotate 90 degrees, the lower end portion of one side of the first linear module is embedded in the silo part, and the lower end portion of the other side of the first linear module is connected to the scanning module The material picking plug-in mechanism is arranged at intervals, and the material picking plug-in mechanism is arranged along the horizontal direction of the mounting plate. One side of the material picking plug-in mechanism is indirectly connected to the code scanning module, and the other side of the material picking plug-in mechanism is indirectly connected to the fixture extraction assembly. The upper end of the material picking plug-in mechanism is rotatably provided with a rotating arm, and the upper end of the rotating arm is sleeved with a manipulator. The front end of the manipulator is movably provided with a moving shaft, and the moving shaft penetrates the front end of the manipulator from top to bottom. A clamping fixture is provided at the lower end of the moving shaft. The material picking plug-in mechanism is provided with a positioning and correction camera, which is installed on the mounting plate, and the positioning and correction camera is located below the clamping fixture. The clamping fixture is sequentially equipped with a test fixture positioning camera and a plug-in mechanism from top to bottom. The plug-in mechanism includes a force sensor, a spring structure, a clamping claw cylinder and a clamping claw, and the force sensor, the spring structure, the clamping claw cylinder and the clamping claw are sequentially connected and fixed to the lower end of the moving shaft from top to bottom.

2. The solid state hard disk plug-in and pull-out device according to claim 1, characterized in that: The silo portion includes a base assembly, a full silo, an empty silo and a material fetching position, wherein the full silo, the empty silo and the material fetching position are sequentially arranged side by side at the upper end of the base assembly along the horizontal direction of the mounting plate, and the lower end of the base assembly is mounted on the mounting plate. The lower end of one side of the first linear module is embedded in the base assembly and is spaced apart from the material fetching position.

3. The solid state hard disk plug-in and pull-out device according to claim 1, characterized in that: The code scanning module includes a product fixture seat and a code scanning component. The product fixture seat is provided with a first main shaft, and a first groove is concavely provided at the top center of the first main shaft. The code scanning component includes a CMOS photosensor and a lens module. A second through hole is provided at the center of the CMOS photosensor. The lens module, the second through hole and the first groove are spaced apart along the same straight line direction.

4. The solid state hard disk plug-in and pull-out device according to claim 3, characterized in that: The first main shaft is symmetrically provided with cylinder assemblies, and upper ends of the cylinder assemblies are respectively provided with fixing parts, and the fixing parts are arranged to face each other.

5. The solid state hard disk plug-in and pull-out device according to claim 3, characterized in that: The product fixture seat is provided with a vacuum adsorption mechanism, the vacuum adsorption mechanism is provided with a customized suction head, the customized suction head is provided with a suction head, the vacuum adsorption mechanism is compressibly embedded in the first groove, and the suction head is protruded outside the first groove.

6. The solid state hard disk plug-in and pull-out device according to claim 4, characterized in that: The cylinder assembly includes a horizontal pushing cylinder, a lifting cylinder and a fixed bracket. The horizontal pushing cylinder is respectively installed on the upper end of the lifting cylinder, and the lower end of the lifting cylinder is respectively installed on the fixed bracket. The fixed brackets are respectively symmetrically arranged on the first main shaft.

7. The solid state hard disk plug-in and pull-out device according to claim 4, characterized in that: The front end of the fixing portion is respectively provided with an arc-shaped groove, and the arc-shaped groove is respectively arranged at a distance from the first groove.

8. The solid state hard disk plug-in and pull-out device according to claim 5, characterized in that: A second groove is recessed on the top of the customized suction head in the horizontal direction of the first groove, and a plurality of small holes are recessed on both sides of the inner wall of the second groove. The length of the second groove is not greater than that of the first groove.

9. The solid state hard disk plug-in and pull-out device according to claim 1, characterized in that: The bottom of the device body is equipped with a plurality of roller skates and a plurality of fixed feet.

10. The solid state hard disk plug-in and pull-out device according to claim 1, characterized in that: The aging car is provided with a lifting mechanism, which is telescopically mounted on the bottom of the aging car, a plurality of fixed columns are arranged at the upper end of the lifting mechanism, a bottom plate is movably arranged at the lower end of the aging car, a plurality of fixed column holes are arranged on the bottom surface of the bottom plate, the fixed columns are matched with the fixed column holes, and the fixed columns are embedded in the fixed column holes.

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