A robot comprehensive training platform positioner

Abstract

The application discloses a robot comprehensive training platform positioner, which comprises a rectangular bottom plate, side plates are fixedly connected between two supporting plates on the bottom plate, a servo motor is fixed on the inner wall of the second supporting plate, a rotating disc is coaxially fixed on the output shaft of the servo motor, a supporting platform is fixed on the rotating disc, a polishing platform is supported on the upper side of the supporting platform through supporting rods, two air cylinders one are arranged below the supporting platform, clamps for clamping workpieces are fixed on the end portions of the telescopic rods of the two air cylinders one, an air cylinder two is fixed on the upper side of the supporting platform, a " ] " type clamping block one is fixed on the telescopic rod of the air cylinder two, an air cylinder three is fixed on the bottom of the supporting platform, a " └ " type clamping block two is connected to the bottom end of the cylinder body of the air cylinder three through a special-shaped block, the air cylinder two and the air cylinder three are operated, the clamping block one and the clamping block two are used for clamping workpieces arranged on the bottom surface of the supporting platform, and through the design of the double-sided tooling clamp, two different forms of working modes can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical teaching, more particularly, it relates to a robot comprehensive training platform positioner. BACKGROUND

[0002] The positioner applied to the robot comprehensive training platform is generally a special welding auxiliary equipment, which is suitable for the welding position of rotary work to obtain ideal machining position and welding speed. The positioner can be used in combination with an operating machine and a welding machine to form an automatic welding center, and can also be used for workpiece position when manual operation. The workbench rotation adopts a frequency converter stepless speed regulation with high speed regulation accuracy. The remote control box can realize remote operation of the workbench, and can also be connected with the operating machine and the welding machine control system to realize linkage operation.

[0003] The existing positioner can only realize workpiece fixing and rotary position to cooperate with the operating machine and the welding machine, and the function is relatively single, which cannot meet the machining requirements of different specifications of workpieces.

[0004] Therefore, in order to solve the above problems, a robot comprehensive training platform positioner needs to be proposed. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide a robot comprehensive training platform positioner, which can realize two different forms of working mode through the design of double-sided tooling fixture. One side can be used for fixing the workpiece needing polishing, and the other side can be used for fixing the workpiece for welding and gluing.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] A robot comprehensive training platform positioner, comprising a rectangular bottom plate, two vertical support plates one and two are arranged in parallel along the length direction of the bottom plate at one end of the bottom plate, both support plates are parallel to the width line of the bottom plate, a cover plate is installed at the top end of the two support plates, and side plates are connected and fixed at the positions on both sides of the two support plates, a servo motor is fixed on the inner wall of the support plate two, a servo motor fixing piece is arranged on the outer wall of the support plate two, the servo motor fixing piece fixes the servo motor on the inner side of the support plate two through bolts, a rotating disc is coaxially fixed on the output shaft of the servo motor by penetrating the support plate two and the servo motor fixing piece, the rotating disc is fixed with a '├' type link plate through bolts, and the horizontal plate of the link plate is fixed with a support platform through bolts.

[0008] A polishing platform is supported by four matrix distributed support rods at a middle position above the support platform, two inward telescopic cylinder one are symmetrically arranged between the support rods and below the polishing platform, a through slot corresponding to the displacement direction of the telescopic rod of the cylinder one is formed on the polishing platform, the end of the two telescopic rods of the cylinder one is fixed with a clamping plate for clamping the workpiece, the clamping plate extends upward and passes through the through slot;

[0009] A cylinder two is fixed on the side of the support platform away from the servo motor, the movement direction of the telescopic rod of the cylinder two is parallel to the length direction of the bottom plate, the outer end of the telescopic rod of the cylinder two extends to the outer side of the support platform and is fixed with a " ] " type clamping block one, a cylinder three is fixed at the end of the support platform away from the cylinder two, the bottom end of the cylinder body of the cylinder three is fixed on the bottom surface of the support platform, the outer end of the telescopic rod of the cylinder three is fixed with a special-shaped block facing the clamping block one, the special-shaped block is fixedly connected with a " └ " type clamping block two through bolts, the clamping block one and the clamping block two are used for clamping the workpiece placed on the bottom surface of the support platform by operating the cylinder two and the cylinder three.

[0010] A protective cover is fixed on the end of the bottom plate away from the support plate one through a connecting block, a gas pressure regulating valve connected with three cylinders is installed on the side plate of the protective cover, a servo driver connected with the servo motor is arranged on the bottom plate.

[0011] Further provided by the application are that a clamping groove is formed in the opposite two side walls of each of the two clamping plates, the clamping groove is open to the outside of the clamping plate, a clamping block matched with the clamping groove is inserted into the clamping groove, a vertical sliding rail groove is formed in the two inner side walls of the clamping groove, a sliding block is arranged on the two side walls of the clamping block, the sliding block is slidingly installed in the corresponding sliding rail groove, a pressing block matched with the clamping surface of the workpiece is fixed on the outer wall of the clamping block, and a limiting mechanism is arranged between the two clamping plates and the clamping block.

[0012] Further provided by the application are that the limiting mechanism comprises an installation groove formed in the outer wall of the clamping plate, a through hole is formed in the bottom of the installation groove, a stop ring is installed at the opening of the through hole, a sliding rod is arranged in the installation groove, the outer end of the sliding rod passes through the stop ring and is installed with a pull plate, the inner end of the sliding rod is provided with a limiting tooth arranged obliquely downward, a baffle is arranged on the sliding rod at a position on the side of the bottom of the installation groove, a spring is sleeved on the sliding rod between the baffle and the stop ring, a limiting tooth groove matched with the limiting tooth is arranged on the inner wall of the clamping block corresponding to the limiting tooth, and when the clamping block is inserted into the clamping groove, the limiting tooth is clamped in the limiting tooth groove under the action of the spring.

[0013] Further arrangement of the present application is that the bottom of the support platform is provided with a clamping assembly for clamping both sides of the workpiece, the clamping assembly comprises a guide groove opened in the bottom of the support platform and parallel to the width direction of the bottom plate, a motor is installed on the side wall of the support platform corresponding to the position of the guide groove, the output shaft of the motor extends horizontally through the support platform into the guide groove and is coaxially fixed with a bidirectional screw rod, a threaded sleeve is sleeved on the position corresponding to the two groups of threads on the bidirectional screw rod, and the two threaded sleeves are matched and installed in the guide groove, and the outer wall of each threaded sleeve is installed with two ''┕'' type clamping plates opposite to the inner buckle.

[0014] Further arrangement of the present application is that the three cylinders are all selected as one-way cylinders.

[0015] Further arrangement of the present application is that the bottom plate is provided with a positioner signal terminal row, the positioner signal terminal row is connected with the cylinder one, the cylinder two and the cylinder three for signal transmission, and the positioner signal terminal row is connected with the servo motor for signal transmission.

[0016] Further arrangement of the present application is that the upper surface of the cover plate is installed with a material box through a V-shaped positioning block.

[0017] Further arrangement of the present application is that an induction switch sensor is arranged on the outer wall of the support plate two directly below the servo motor fixing plate, and a positioner zero point calibration piece is arranged on the circumferential wall of the rotating disc, and the positioner zero point calibration piece corresponds to the induction switch sensor when the support platform is in a horizontal state.

[0018] In summary, the present application has the following advantages:

[0019] The rotating disc is driven by the servo motor to drive the support platform to rotate, so that the welding positioner is realized, the polishing platform is arranged on the support platform, and the two opposite cylinders one are arranged below the polishing platform, the telescopic rods of the cylinders one are connected with the clamps for clamping the workpieces to be polished, the workpieces to be polished can be clamped, the cylinder two is fixed on the side of the support platform away from the servo motor, the outer end of the telescopic rod of the cylinder two extends to the outside of the support platform and is fixed with a '' ] '' type clamping block one, the cylinder three is fixed on the end of the bottom of the support platform away from the cylinder two, the outer end of the telescopic rod of the cylinder three is fixed with a special-shaped block facing the clamping block one, and the special-shaped block is fixedly connected with a '' └ '' type clamping block two through bolts, and the workpiece to be welded is placed on the bottom surface of the support platform, and the cylinders two and three are operated to clamp the workpiece, so that two different forms of work modes are realized.

[0020] The clamping grooves are opened on the two opposite side walls of the two clamps, the clamping blocks are inserted in the clamping grooves, and the pressing blocks matched with the clamping surfaces of the workpieces are fixed on the outer walls of the clamping blocks, so that the clamping blocks with different shaped pressing blocks can be replaced according to the shape of the clamping surface of the workpiece to be polished.

[0021] By setting the limiting mechanism between the two clamping plates and the clamping block, the corresponding clamping block is inserted into the clamping groove, under the action of the spring force, the limiting teeth are clamped in the limiting tooth groove, the clamping block is limited, when the clamping block needs to be replaced, the pull plate needs to be pulled, so that the limiting teeth are separated from the limiting tooth groove;

[0022] By setting the clamping assembly, the clamping and further fixing of the workpiece to be welded can be realized, when the workpiece needs to be clamped or loosened, only the motor needs to be operated, so that the two threaded sleeves move towards each other;

[0023] By selecting a one-way air cylinder, the air cylinder can be controlled by a single air pipe, and the excessive air pipes are avoided to cause the workbench to be messy and the workpiece to be damaged by falling off;

[0024] By setting the inductive switch sensor on the outer wall of the support plate two below the servo motor fixing plate, and setting the zero point calibration element of the transverse machine on the circumferential wall of the rotating disc, when the support platform is in a horizontal state, the zero point calibration element of the transverse machine is close to the inductive switch sensor, so that the inductive switch sensor sends a signal. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a whole structure schematic view of the present application;

[0026] Figure 2 It is a front view of the whole structure schematic view of the present application;

[0027] Figure 3 It is a clamping and clamping block view;

[0028] Figure 4 It is a structure sectional view of the limiting mechanism;

[0029] Figure 5 It is a structure schematic view of the clamping assembly at the bottom of the support platform.

[0030] Label: 1, bottom plate; 2, support plate one; 3, support plate two; 4, cover plate; 5, side plate; 6, servo motor fixing plate; 7, rotating disc; 8, link plate; 9, support platform; 10, polishing platform; 11, cylinder one; 12, through slot; 13, clamping plate; 14, cylinder two; 15, clamping block one; 16, cylinder three; 17, special-shaped block; 18, clamping block two; 19, protective cover; 20, gas supply pressure regulating valve; 21, servo driver; 22, clamping groove; 23, clamping block; 24, slide rail groove; 25, sliding block; 26, pressing block; 27, mounting groove; 28, through hole; 29, blocking ring; 30, spring; 31, limiting tooth groove; 32, limiting tooth; 33, pull plate; 34, motor; 35, bidirectional screw; 36, threaded sleeve; 37, guide groove; 38, clamping plate; 39, positioner signal terminal row; 40, V-shaped positioning block; 41, material box; 42, inductive switch sensor; 43, positioner zero point calibration; 44, slide rod; 45, baffle. DETAILED DESCRIPTION

[0031] The application will be described in detail below with reference to the drawings.

[0032] Embodiment: A positioner of a robot comprehensive practical training platform, through the design of a double-sided tooling clamp, two different forms of working modes can be realized, one side can be used for fixing workpieces needing polishing and polishing, and the other side can be used for fixing workpieces for welding and gluing.

[0033] Reference Figure 1 , Figure 2The utility model relates to a kind of welding positioner, including rectangle base plate 1, two vertical direction support plates one 2, support plate two 3 are arranged in parallel along its length direction in one end on base plate 1, two support plates are parallel with the width line of base plate 1, cover plate 4 is installed in the top end of two support plates, and side plate 5 is fixedly connected in the position between two support plates and on its two sides, servo motor is fixed on the inner wall of support plate two 3, servo motor fixing sheet 6 is arranged on the outer wall, servo motor fixing sheet 6 is fixed servo motor inside support plate two 3 by bolt, rotating disc 7 is coaxially fixed by the output shaft of servo motor passing through support plate two 3 and servo motor fixing sheet 6, rotating disc 7 is fixed by bolt with '' type link plate 8, support platform 9 is fixed by bolt with the horizontal plate of link plate 8, polishing platform 10 is supported by four matrix distribution support rods in the middle position above support platform 9, two telescopic cylinder one 11 that go inwards are symmetrically arranged between support rod and below polishing platform 10, the end of the telescopic rod of two cylinder one 11 is fixed with the clamping plate 13 for clamping workpiece, clamping plate 13 extends upwards and passes through through slot 12, cylinder two 14 is fixed above support platform 9 and on its side away from servo motor, the movement direction of the telescopic rod of cylinder two 14 is parallel with the length direction of base plate 1, the outer end of the telescopic rod of cylinder two 14 extends to the outside of support platform 9 and is fixed with '' type clamping block one 15, cylinder three 16 is fixed in the end of support platform 9 bottom away from cylinder two 14, the bottom end of the cylinder body of cylinder three 16 is fixed on the bottom surface of support platform 9, the outer end of the telescopic rod of cylinder three 16 is fixed with the special-shaped block 17 towards clamping block one 15, the special-shaped block 17 is fixedly connected with '' type clamping block two 18 by bolt, clamping block one 15 and clamping block two 18 are used to clamp the side surface and bottom surface of workpiece placed on the bottom surface of support platform 9 by operating cylinder two 14 and cylinder three 16, protective cover 19 is fixed on the end of base plate 1 away from support plate one 2 by connecting block, gas pressure regulating valve 20 connected with three cylinders is installed on the side plate 5 of protective cover 19, servo driver 21 connected with servo motor is arranged on base plate 1.Servo motor drives rotating disc 7 in turn and drives support platform 9 to rotate, realize the welding positioner of positioner.

[0034] The grinding platform 10 is arranged on the support platform 9, and the two opposite air cylinders I 11 are arranged below the grinding platform 10, the extension rods of the air cylinders I 11 are connected with the clamping plates 13 for clamping the workpieces to be ground, the clamping of the workpieces to be ground can be realized, the air cylinder II 14 is fixed on the side of the support platform 9 away from the servo motor, the outer end of the extension rod of the air cylinder II 14 extends to the outer side of the support platform 9 and is fixed with the “]” type clamping block I 15, the air cylinder III 16 is fixed on the bottom of the support platform 9 away from the air cylinder II 14, the outer end of the extension rod of the air cylinder III 16 is fixed with the special-shaped block 17 facing the clamping block I 15, and the special-shaped block 17 is fixedly connected with the “┘” type clamping block II 18 through bolts, and the workpieces to be welded are placed on the bottom surface of the support platform 9. The air cylinder II 14 and the air cylinder III 16 are operated to clamp the workpieces, and the above can realize two different forms of working modes.

[0035] In combination Figure 3 、 Figure 4 The clamping grooves 22 are formed on the opposite two side walls of the two clamping plates 13, the clamping grooves 22 are open to the outside of the clamping plates 13, the clamping blocks 23 matched with the clamping grooves 22 are inserted into the clamping grooves 22, the vertical sliding rail grooves 24 are formed on the two inner side walls of the clamping grooves 22, the sliding blocks 25 are arranged on the two side walls of the clamping blocks 23, the sliding blocks 25 are slidingly installed in the corresponding sliding rail grooves 24, the pressing blocks 26 matched with the clamping surfaces of the workpieces are fixed on the outer walls of the clamping blocks 23, and the limiting mechanisms are arranged between the two clamping plates 13 and the clamping blocks 23. The limiting mechanism comprises the mounting groove 27 formed on the outer wall of the clamping plate 13, the through hole 28 is formed in the bottom of the mounting groove 27, the stop ring 29 is mounted at the opening of the through hole 28, the sliding rod 44 is arranged in the mounting groove 27, the outer end of the sliding rod 44 passes through the stop ring 29 and is provided with the pull plate 33, the inner end of the sliding rod 44 passes through the through hole 28 and is provided with the limiting teeth 32 arranged obliquely downward, the stop plate 45 is arranged on the sliding rod 44 at the position on the side of the bottom of the mounting groove 27, the spring 30 is sleeved on the sliding rod 44 between the stop plate 45 and the stop ring 29, and the limiting tooth grooves 31 matched with the limiting teeth 32 are arranged on the inner walls of the clamping blocks 23 corresponding to the limiting teeth 32. When the clamping blocks 23 are inserted into the clamping grooves 22, the limiting teeth 32 are clamped in the limiting tooth grooves 31 under the action of the spring 30.

[0036] The clamping grooves 22 are formed on the opposite two side walls of the two clamping plates 13, the clamping blocks 23 are inserted into the clamping grooves 22, the pressing blocks 26 matched with the clamping surfaces of the workpieces are fixed on the outer walls of the clamping blocks 23, the clamping blocks 23 with different shapes of pressing blocks 26 can be replaced according to the shape of the clamping surface of the workpiece to be ground, the limiting mechanisms are arranged between the two clamping plates 13 and the clamping blocks 23, the corresponding clamping blocks 23 are inserted into the clamping grooves 22, the limiting teeth 32 are clamped in the limiting tooth grooves 31 under the action of the spring 30, and the clamping blocks 23 are limited. When it is necessary to replace the clamping blocks 23, the pull plate 33 needs to be pulled to separate the limiting teeth 32 from the limiting tooth grooves 31.

[0037] Reference Figure 5 The clamping assembly for clamping both sides of the workpiece is arranged at the bottom of the support platform 9 below the air cylinder two 14, which comprises a guide groove 37 arranged at the bottom of the support platform 9 and parallel to the width direction of the bottom plate 1. A motor 34 is installed on the side wall of the support platform 9 corresponding to the position of the guide groove 37. The output shaft of the motor 34 extends horizontally through the support platform 9 into the guide groove 37 and is coaxially fixed with a double screw rod 35. Threaded sleeves 36 are sleeved on the double screw rod 35 corresponding to the positions of the two groups of threads. The two threaded sleeves 36 are matched and installed in the guide groove 37, and the outer wall of each threaded sleeve 36 is installed with two “┕” type clamping plates 38 opposite to the inner buckle. When clamping or releasing the workpiece is needed, only the motor 34 needs to be operated to make the two threaded sleeves 36 move towards each other, so that the clamping and further fixing of the workpiece to be welded can be realized to ensure the accuracy of subsequent welding and gluing.

[0038] In combination Figure 1 The three air cylinders are all one-way air cylinders, which can realize single air pipe control of the air cylinder and avoid the disorder of the workbench caused by too many air pipes and the falling of the workpiece. The bottom plate 1 is provided with a variable positioner signal terminal row 39 for arrangement, and the variable positioner signal terminal row 39 is connected with the air cylinder one 11, the air cylinder two 14 and the air cylinder three 16 for signal transmission, and the variable positioner signal terminal row 39 is connected with the servo motor for signal transmission. The material box 41 is installed on the upper surface of the cover plate 4 through the V-shaped positioning block 40.

[0039] Reference Figure 2 The inductive switch sensor 42 is arranged on the outer wall of the support plate two 3 directly below the servo motor fixing piece 6, and the variable positioner zero point calibration piece 43 is arranged on the circumferential wall of the rotating disc 7. When the support platform 9 is in a horizontal state, the variable positioner zero point calibration piece 43 corresponds to the inductive switch sensor 42. When the support platform 9 is in a horizontal state, the variable positioner zero point calibration piece 43 corresponds to the inductive switch sensor 42 and is close to each other, so that the inductive switch sensor 42 sends out a signal.

[0040] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solutions falling within the concept of the present application shall be within the protection scope of the present application. It should be noted that for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principles of the present application shall also be considered as the protection scope of the present application.

Claims

1. A robot comprehensive training platform positioner, characterized in that: It includes a rectangular bottom plate, at one end of which Two vertical support plates 1 and 2 are arranged parallel to each other along its length direction, and the two support plates are parallel to the width edge lines of the bottom plate. Cover plates are installed on the top ends of the two support plates, and side plates are connected and fixed between the two support plates at positions on both sides thereof. A servo motor is fixed on the inner wall of the second support plate, and a servo motor fixing plate is provided on the outer wall thereof. The servo motor fixing plate is fixed to the servo motor on the inner side of the second support plate by bolts, and the output shaft of the servo motor passes through the second support plate and the servo motor fixing plate to be coaxially fixed with a rotating disk, and the rotating disk is fixed with a "├"-shaped link plate by bolts, and the horizontal plate of the link plate is fixed to the supporting platform by bolts; A grinding platform is supported in the middle position above the support platform by four support rods distributed in a matrix. Two cylinders with inwardly facing telescopic rods are symmetrically arranged between the support rods and below the grinding platform. A through slot corresponding to the displacement direction of the telescopic rod of the cylinder is opened on the grinding platform. Clamps for clamping workpieces are fixed at the ends of the two telescopic rods of the cylinder, and the clamps extend upward and pass through the through slot. A second air cylinder is fixed above the support platform on a side away from the servo motor, the movement direction of the telescopic rod of the second air cylinder is parallel to the length direction of the base plate, the outer end of the telescopic rod of the second air cylinder extends to the outside of the support platform and is fixed with a "]"-shaped clamping block 1, and a third air cylinder is fixed at the end of the bottom of the support platform away from the second air cylinder, the bottom end of the cylinder body of the third air cylinder is fixed to the bottom surface of the support platform, the outer end of the telescopic rod thereof is fixed with a special-shaped block facing the first clamping block, and the special-shaped block is fixedly connected with a "┘"-shaped clamping block 2 by bolts, operating the second air cylinder and the third air cylinder, and the first clamping block and the second clamping block are used to clamp a workpiece placed on the bottom surface of the support platform; A protective cover is fixed to the end of the bottom plate away from the support plate through a connecting block, an air supply pressure regulating valve connected to three cylinders is installed on the side plate of the protective cover, and a servo driver connected to the servo motor is provided on the bottom plate; A clamping groove is provided on the two opposite side walls of the two clamping plates, the upper part of the clamping groove leads to the outside of the clamping plate, a matching clamping block is inserted in the clamping groove, a vertical slide rail groove is provided on the two inner side walls of the clamping groove, a slider is provided on the two side walls of the clamping block, the slider is slidably installed in the corresponding slide rail groove, a pressing block matching the clamping surface of the workpiece is fixed on the outer wall of the clamping block, and a limiting mechanism is provided between the two clamping plates and the clamping block; The limit mechanism comprises a mounting groove provided on the outer wall of the splint, a through hole provided at the bottom of the mounting groove, a retaining ring installed at the opening, a sliding rod passing through the mounting groove, the outer end of the sliding rod passes through the retaining ring and a pull plate is installed, the inner end of the sliding rod passes through the through hole and is provided with a limiting tooth arranged obliquely downward, a baffle is provided on the sliding rod at a position on one side of the bottom of the mounting groove, a spring is sleeved on the sliding rod between the baffle and the retaining ring, and a limiting tooth groove matching the limiting tooth is provided on the inner wall corresponding to the clamping block and the limiting tooth. When the clamping block is inserted into the clamping groove, under the action of the spring, the limiting tooth is clamped in the limiting tooth groove; A clamping assembly for clamping both sides of the workpiece is provided at a position below the second cylinder at the bottom of the support platform, and the clamping assembly includes a guide groove provided at the bottom of the support platform and parallel to the width direction of the base plate, and a motor is installed at a position corresponding to the guide groove on the side wall of the support platform, and the output shaft of the motor horizontally passes through the support platform and extends into the guide groove and is coaxially fixed with a bidirectional screw, and threaded sleeves are sleeved at positions corresponding to the two sets of threads on the bidirectional screw, and the two threaded sleeves are matched and installed in the guide groove, and two "┕"-shaped clamping plates that are buckled inward relative to each other are installed on the outer wall of the bidirectional screw; An inductive switch sensor is provided on the outer wall of the second support plate just below the servo motor fixing plate, and a positioner zero point calibration part is provided on the circumferential wall of the rotating disk. When the support platform is in a horizontal state, the positioner zero point calibration part corresponds to the inductive switch sensor.

2. The robot comprehensive training platform positioner according to claim 1, characterized in that: Cylinder 1, cylinder 2 and cylinder 3 are all one-way cylinders.

3. The robot comprehensive training platform positioner according to claim 1, characterized in that: A positioner signal terminal block is provided on the bottom plate, and the positioner signal terminal block is connected to cylinder one, cylinder two, and cylinder three for signal transmission, and the positioner signal terminal block is connected to the servo motor for signal transmission.

4. The robot comprehensive training platform positioner according to claim 1, characterized in that: A material box is installed on the upper surface of the cover plate through a V-shaped positioning block.

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