CN110426630B - Single slide carriage opposite-dragging type linear motor test platform - Google Patents
Single slide carriage opposite-dragging type linear motor test platform Download PDFInfo
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- CN110426630B CN110426630B CN201910722010.9A CN201910722010A CN110426630B CN 110426630 B CN110426630 B CN 110426630B CN 201910722010 A CN201910722010 A CN 201910722010A CN 110426630 B CN110426630 B CN 110426630B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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Abstract
A single slide carriage opposite dragging type linear motor test platform belongs to the technical field of linear motor test. The problem of two slide carriages to towed linear electric motor test platform start hysteresis power big, load response speed is slow is solved. According to the invention, the test slide carriage supports the loading connecting plate through the transmission mechanism, so that the loading connecting plate is suspended on the base, the supporting and transmission relation between the test slide carriage and the loading connecting plate is realized, the loading connecting plate can be made of non-marble materials, the tested linear motor drives the movers of the two coreless linear motors for loading connected with the loading connecting plate to move under the action of the output force of the movers of the tested linear motor, or the loading connecting plate pushes the testing slide carriage and the movers of the tested linear motor connected with the testing slide carriage to move under the action of the driving force of the movers of the coreless linear motor for loading, and the starting hysteresis power of the testing platform is reduced. The invention mainly tests the linear motor.
Description
Technical Field
The invention relates to a novel single slide carriage opposite dragging type linear motor testing platform, and belongs to the technical field of linear motor testing.
Background
In the field of modern processing industry, linear motors are widely used in factory automation, reciprocating servo systems, conveying systems, transportation and the like, in particular in the aspect of numerical control machine tools. The traditional numerical control machine adopts a driving mode of a rotating motor and a ball screw, and the driving mode has a plurality of adverse factors including length limitation, pitch period error, mechanical backlash during feeding, friction with a coupling component, coupling inertia and the like, which limit the working efficiency and the working precision of the machine. Compared with the traditional driving mode of a rotating motor and a ball screw, the direct driving device avoids possible errors in an intermediate transmission link, and has the advantages of compact structure, high positioning precision, good acceleration and deceleration performance, wide speed range and no reverse gap. In recent years, with the progress of linear motor technology, more and more numerical control machine tools begin to directly use the numerical control machine tools to obtain linear motion. By adopting the direct driving technology, the linear motor has the advantages of high speed, high acceleration, high positioning precision, long stroke, quick dynamic response and the like, and the requirements of the modern numerical control machine precision machining technology are just met.
However, according to the requirements of the numerical control machine tool system, whether the performance and the characteristics of the linear motor developed or purchased meet the requirements or not, how to accurately and objectively evaluate the performance of the linear motor system needs to be completed by a perfect linear motor system test platform.
The conventional linear motor testing device generally adds the self weight of the weight to the rotor of the linear motor through pulleys and driving ropes to form unidirectional tension to be loaded on the linear motor. The weight of the weight is continuously increased, and when the linear motor starts to move at a uniform speed, the hysteresis power of the linear motor is equal to the weight of the weight, so that the maximum static force of the linear motor is obtained. The test device has a series of disadvantages:
(1) When the loading thrust is tested, only one-way and one-way measurement can be carried out, and the test is not suitable for testing a short-stroke linear motor;
(2) The loading force cannot be changed continuously, and the load can be changed only by adding or reducing weights;
(3) The acceleration of the weight needs to be overcome during acceleration, so that the acceleration section can not be measured, only a uniform speed state can be measured, and the test time is long;
(4) The system adopts a transmission rope, and generates deformation when being loaded, and larger thrust disturbance can be generated when the system moves, so that the test precision is affected;
(5) The measuring process is complex, and the measuring precision is low;
(6) The test parameters are single, and only the static force of the linear motor can be measured;
(7) Only static parameters can be tested, and the dynamic performance and characteristic test of the system performance can not be completed.
The utility model also discloses a pair-drag type high accuracy linear motor test platform of two slide carriages among the prior art, this kind of test platform's loading part and test part are all realized with air supporting and marble Dan Liuban, because its loading part also is realized through the slide carriage that marble was made, marble Dan Benchong, lead to test motor loading hysteresis power big, load response speed is slow, therefore, the above problem needs to be solved urgently.
Disclosure of Invention
The invention provides a single slide plate opposite dragging type linear motor test platform, which aims to solve the problems of large starting hysteresis power and low loading response speed of a double slide plate opposite dragging type linear motor test platform.
A single slide carriage opposite dragging type linear motor testing platform comprises a base, two coreless linear motors for loading, a testing slide carriage, a tension pressure sensor, a linear grating, a tested linear motor driver and two loading linear motor drivers;
the stators of the two coreless linear motors for loading and the stator of the tested linear motor are fixed on the base, and are parallel to each other, the stator of the tested linear motor is positioned between the two coreless linear motors for loading, and the rotor of the tested linear motor is fixed on the bottom surface of the test slide carriage;
the two loading linear motor drivers are used for driving the two coreless linear motors for loading respectively, and the tested linear motor driver is used for driving the tested linear motor;
the test slide carriage is realized by marble and is suspended on the base in an air floatation supporting mode;
the linear grating is used for collecting the position information of the mover of the linear motor to be tested;
the test platform also comprises a loading connecting plate and a transmission mechanism, wherein the loading connecting plate is made of non-marble materials;
the loading connecting plate, the testing slide carriage and the transmission mechanism are all positioned above the stator of the tested linear motor, and the loading connecting plate and the testing slide carriage cross the stator of the tested linear motor;
the movers of the two coreless linear motors for loading are fixed at the bottom of the loading connecting plate;
the test slide carriage supports the loading connecting plate through the transmission mechanism, so that the loading connecting plate is suspended on the base, and in the horizontal direction, the test slide carriage is far away from or near to the loading connecting plate through the transmission mechanism under the action of loading force or the pushing force of a tested motor;
the tension and pressure sensor is connected between the loading connecting plate and the testing slide carriage.
Preferably, the loading connecting plate is of a flat plate structure, and the transmission mechanism comprises two sets of sliding sleeve assemblies;
each set of sliding sleeve assembly comprises a sliding column and a sleeve, one end of the sliding column is fixedly connected with one end face of the test slide carriage, and the other end of the sliding column extends into the sleeve and is in sliding connection with the sleeve;
two through holes are arranged between the front end face and the rear end face of the loading connecting plate, and sleeves are embedded in the two through holes respectively.
Preferably, the loading connection plate is of a hollowed-out plate-shaped structure.
Preferably, the base is provided with two bar-shaped guide rails, the two coreless linear motors for loading are respectively positioned at two sides of the two bar-shaped guide rails, and the tested linear motor is positioned between the two bar-shaped guide rails;
the upper surfaces of the two strip-shaped guide rails are used as air floatation surfaces.
Preferably, the linear grating comprises a grating ruler and a reading head;
the grating ruler is fixed on the side wall of one bar-shaped guide rail of the base, the reading head is on the same side as the grating ruler, and the reading head is fixed on the test slide carriage.
Preferably, the single slide carriage opposite-dragging type linear motor test platform further comprises 4 anti-collision buffers;
the 4 anti-collision buffers are respectively fixed at two ends of the two strip-shaped guide rails on the base.
The single slide carriage opposite-dragging type linear motor testing platform provided by the invention can realize high-precision testing of various characteristics of the tested linear motor, such as thrust, speed, positioning force, static thrust, dynamic thrust, thrust fluctuation, thrust coefficient, counter potential coefficient, thrust linearity, overload capacity and the like.
According to the single slide carriage opposite-dragging type linear motor testing platform, the loading mode can be divided into an active loading mode and a passive loading mode according to the working mode of the coreless linear motor for loading.
And (I) during active loading, 2 sets of coreless linear motors for loading are synchronously driven and controlled by a driver, the rotor part or windings of the motor to be tested are open, or current is supplied by an alternating current and direct current programmable power supply, and the 2 sets of coreless linear motors for loading push the rotor of the motor to be tested to move, so that the testing of the positioning force, static thrust, thrust linearity, thrust coefficient, counter electromotive force waveform and counter electromotive force coefficient of the motor to be tested can be completed.
The specific process for measuring the positioning force of the linear motor to be measured comprises the following steps: the winding of the rotor part of the linear motor to be tested is opened, the rotor of the linear motor to be tested is dragged by the coreless linear motor to do low-speed uniform motion (v is less than or equal to 0.001 m/s), the motion position of the rotor of the linear motor to be tested and the reading of the pulling pressure sensor corresponding to the position are read and recorded by utilizing the linear grating in the uniform motion process of the linear motor to be tested, the reading data of all the force sensors at all the positions are averaged (friction force), and the force reading value at each position is subtracted by the average value, so that the positioning force value corresponding to each position can be obtained.
The specific process for measuring the static thrust, the thrust linearity and the thrust coefficient of the tested linear motor comprises the following steps: D.C. current I is led into any two phases of three-phase windings of the tested linear motor by utilizing a programmable power supply of A.C. and D.C. 1 The mover of the tested linear motor is dragged by the coreless linear motor to make small-step-distance stepping motion, and the linear grating is utilized to read and record the moving position of the mover in the stepping motion process of the mover of the tested linear motorAnd reading the pulling pressure sensor corresponding to the positions to obtain static thrust values corresponding to the positions. The direct current introduced by the winding can be of different values, so that the static thrust curve of the linear motor under different currents can be obtained, and the peak static thrust F under different currents is drawn max1 And (3) determining the thrust linearity of the linear motor by using the curve. Meanwhile, the thrust coefficient of the tested linear motor can be calculated
Measuring counter potential coefficient K of linear motor to be measured E The specific method of (a) is as follows: dragging a rotor of a tested linear motor to move at a constant speed v by adopting 2 sets of coreless linear motors for loading, and collecting effective values E of electromotive force fundamental waves at two ends of any two-phase winding in the tested linear motor in the process of uniform movement of the tested linear motor 0 Obtaining the counter potential coefficient of the linear motor to be tested
And (II) when passive loading is performed, 2 sets of coreless linear motors for loading work in a power generation braking state in a speed control mode, the motor to be tested is driven by a driver at the moment, and the mover of the motor to be tested pushes the mover of the coreless linear motor for loading to perform linear motion in a thrust control mode, so that the testing of parameters such as thrust, thrust fluctuation, overload capacity, speed ring rigidity and the like of the motor to be tested can be completed.
When the thrust and thrust fluctuation of the tested linear motor are measured, the linear motor is driven by a linear motor driver to do linear motion, and a thrust control mode is adopted by the system; the loading coreless linear motor adopts a speed control mode and works in a power generation braking state. The linear motor is enabled to stably run at different speed points, the loading is carried out by using the coreless linear motor to apply hysteresis power to the linear motor, and the force sensor is used for continuously measuring and recording the output thrust in the whole stroke of the linear motor; at the same time find out the maximum thrust F max And minimum thrust F min (i.e., transient value) the thrust wave is calculated using the followingDynamic rate.
The beneficial effects brought by the invention are as follows:
(1) The test platform adopts the linear motor to load the towing mode, so that bidirectional test can be realized;
(2) The test platform adopts the coreless linear motor to load, is convenient and reliable to control, and the loading force can be continuously adjusted in the movement process of the linear motor, so that the system test precision is improved;
(3) The test platform has only 1 slide carriage, and has the advantages of low cost, simple structure, convenient operation and high reliability;
(4) The slide carriage of the test platform adopts the air floatation support, thereby fundamentally eliminating the influence of friction force in the test process and greatly improving the precision of the test platform;
(5) The invention improves the material and the supporting mode of the loading connecting plate, so that the defects of large starting hysteresis power and slower loading response speed of the test motor are fundamentally overcome, the test operation is convenient, the control is easy, the flexibility is high, and the reliability is high.
(6) The test slide carriage supports the loading connecting plate through the transmission mechanism, so that the loading connecting plate is suspended on the base, and in the horizontal direction, the test slide carriage is far away from or near to the loading connecting plate through the transmission mechanism under the action of loading force or the pushing force of the tested motor.
Drawings
FIG. 1 is a schematic diagram of an assembled structure of a single slide pair-towed linear motor test platform according to the present invention;
fig. 2 is an exploded assembly schematic view of a single slide pair-towed linear motor testing platform according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
Referring to fig. 1, the embodiment is illustrated, and the single slide pair dragging type linear motor testing platform according to the embodiment comprises a base 1, two loading coreless linear motors 2, a testing slide 4, a tension pressure sensor 6, a linear grating 7, a tested linear motor driver and two loading linear motor drivers;
the stators of the two coreless linear motors 2 for loading and the stator of the linear motor 9 to be tested are fixed on the base 1 and are parallel to each other, the stator of the linear motor 9 to be tested is positioned between the two coreless linear motors 2 for loading, and the rotor of the linear motor 9 to be tested is fixed on the bottom surface of the test slide carriage 4;
the two loading linear motor drivers are used for respectively driving the two coreless linear motors 2 for loading, and the tested linear motor driver is used for driving the tested linear motor 9;
the test slide carriage 4 is realized by marble and is suspended on the base 1 in an air floatation supporting mode;
the linear grating 7 is used for collecting the position information of the rotor of the linear motor 9 to be tested;
the test platform also comprises a loading connecting plate 3 and a transmission mechanism 5, wherein the loading connecting plate 3 is not marble;
the loading connecting plate 3, the testing slide carriage 4 and the transmission mechanism 5 are all positioned above the stator of the tested linear motor 9, and the loading connecting plate 3 and the testing slide carriage 4 cross the stator of the tested linear motor 9;
the movers of the two coreless linear motors 2 for loading are fixed at the bottom of the loading connecting plate 3;
the test slide carriage 4 supports the loading connecting plate 3 through the transmission mechanism 5, so that the loading connecting plate 3 is suspended on the base 1, and the test slide carriage 4 is far away from or near to the loading connecting plate 3 through the transmission mechanism 5 under the action of loading force or the pushing force of a tested motor in the horizontal direction;
a tension and pressure sensor 6 is connected between the loading connection plate 3 and the test slide 4.
In this embodiment, the loading force is a force applied to the mover of the linear motor 9 to be measured, and the motor thrust to be measured is an output force of the mover of the linear motor 9 to be measured.
Because the air floatation supporting mode of the double slide carriages in the opposite-dragging type linear motor testing platform in the prior art ensures that the double slide carriages are made of marble materials, the influence of the air floatation supporting thrust fluctuation on the slide carriage form change can be reduced, and the air floatation supporting mode of the testing part and the loading part ensures that the double slide carriages are made of marble materials.
The loading connection plate 3 of the loading part not only replaces the marble Dan Liuban of the loading part of the conventional dual-slide opposite-dragging type linear motor testing platform, but also improves the supporting mode of the loading connection plate 3 of the loading part, and the loading connection plate 3 is supported by the testing slide 4, so that the loading connection plate 3 is suspended on the base 1, therefore, under the condition that the supporting and connecting mode exists, the loading connection plate 3 can be made of non-marble materials, the testing precision and testing performance of the testing motor in the testing process can be ensured under the condition that the non-marble materials are selected, and the loading connection plate 3 is qualified to be made of the non-marble materials, so that the technical bias of the loading connection plate 3 of the loading part in the process that only marble materials can be selected is overcome, the loading connection plate 3 is very light and thin, the starting hysteresis power of the testing motor is greatly reduced, the loading response of the testing motor is faster, the testing operation is convenient, the control is easy, the flexibility is high, and the reliability is high.
The loading connection plate 3 is preferably made of aluminum alloy or PEEK plate.
On one hand, the invention only suspends the test slide carriage 4 on the base 1 in an air floatation supporting mode, and the supporting mode fundamentally eliminates the influence of friction force in the test process and greatly improves the precision of the test platform.
On the other hand, the test slide carriage 4 is connected with the loading connecting plate 3 through the transmission mechanism 5, and the structural support and transmission relation ensures that the test slide carriage 4 drives the movers of the two coreless linear motors 2 for loading connected with the loading connecting plate 3 to move under the action of the output force of the movers of the linear motors 9 for testing in the loading process, or the loading connecting plate 3 pushes the test slide carriage 4 and the movers of the linear motors 9 for testing connected with the test slide carriage 4 to move under the action of the driving force of the movers of the coreless linear motors 2 for loading, and the structural support and transmission relation ensures that the loading centroid is stable, so that the loading stability and the loading precision are further improved.
The single slide carriage opposite-dragging type linear motor testing platform is simple in structure.
Referring to fig. 1 and 2, the preferred embodiment is described, in which the loading connection plate 3 is in a flat plate structure, and the transmission mechanism 5 comprises two sets of sliding sleeve assemblies;
each set of sliding sleeve assembly comprises a sliding column 5-1 and a sleeve 5-2, one end of the sliding column 5-1 is fixedly connected with one end face of the test slide carriage 4, and the other end of the sliding column 5-1 extends into the sleeve 5-2 and is in sliding connection with the sleeve 5-2;
two through holes are arranged between the front end face and the rear end face of the loading connecting plate 3, and the two through holes are respectively embedded with a built-in sleeve 5-2.
The transmission mechanism 5 provided in the preferred embodiment is compact in structure and does not increase the occupied space of the test platform.
The preferred embodiment is described with reference to fig. 1 and 2, in which the loading connection plate 3 is a hollowed plate structure.
In the preferred embodiment, the hollow structure of the loading connecting plate 3 is arranged, so that the weight of the loading connecting plate 3 is lighter on the basis of ensuring the structural strength of the loading connecting plate 3, the loading response speed of the test motor is improved, the flexibility is high, and the reliability is high. The hollowed-out shape can be a through hole with various shapes such as ellipse, square, round, prismatic and the like.
Referring to fig. 1 and 2, the preferred embodiment is described, in the preferred embodiment, two bar-shaped guide rails 1-1 are provided on a base 1, two coreless linear motors 2 for loading are respectively located at two sides of the two bar-shaped guide rails 1-1, and a linear motor 9 to be tested is located between the two bar-shaped guide rails 1-1;
the upper surfaces of the two strip-shaped guide rails 1-1 are used as air floatation surfaces.
In the preferred embodiment, the base 1 is provided with two bar-shaped guide rails 1-1, and the tested linear motor 9 is positioned between the two bar-shaped guide rails 1-1, so that the moving direction of the mover of the tested linear motor 9 is guided, and the stability of the loading process of the test motor is ensured.
Referring to fig. 1 and 2, the preferred embodiment is described, in which the linear grating 7 includes a grating scale 7-1 and a reading head 7-2;
the grating ruler 7-1 is fixed on the side wall of one bar-shaped guide rail 1-1 of the base 1, the reading head 7-2 is on the same side as the grating ruler 7-1, and the reading head 7-2 is fixed on the test slide carriage 4.
In the preferred embodiment, the arrangement mode of the grating ruler 7-1 and the reading head 7-2 does not increase the occupied space of the test platform, and the compact structure of the test motor is ensured.
Referring to fig. 1 and 2, the preferred embodiment of the present invention is described, and the test platform for a single slide-board pair-towed linear motor of the preferred embodiment further includes 4 anti-collision buffers 8;
the 4 anti-collision buffers 8 are respectively fixed at two ends of the two strip-shaped guide rails 1-1 on the base 1.
In the preferred embodiment, the anti-collision buffer 8 is arranged in a manner that the moving distance of the mover of the tested linear motor 9 in the length direction of the base 1 is reasonably limited.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other described embodiments.
Claims (6)
1. A single slide carriage opposite dragging type linear motor testing platform comprises a base (1), two coreless linear motors (2) for loading, a testing slide carriage (4), a pulling pressure sensor (6), a linear grating (7), a tested linear motor driver and two loading linear motor drivers;
the stators of the two coreless linear motors (2) for loading and the stator of the linear motor (9) to be tested are fixed on the base (1) and are parallel to each other, the stator of the linear motor (9) to be tested is positioned between the two coreless linear motors (2) for loading, and the rotor of the linear motor (9) to be tested is fixed on the bottom surface of the test slide carriage (4);
the two loading linear motor drivers are used for driving the two coreless linear motors (2) for loading respectively, and the tested linear motor drivers are used for driving the tested linear motor (9);
the test slide carriage (4) is realized by marble and is suspended on the base (1) in an air floatation supporting mode;
the linear grating (7) is used for collecting the position information of the rotor of the linear motor (9) to be tested;
the testing platform is characterized by further comprising a loading connecting plate (3) and a transmission mechanism (5), wherein the loading connecting plate (3) is made of non-marble materials;
the loading connecting plate (3), the testing slide carriage (4) and the transmission mechanism (5) are all positioned above the stator of the tested linear motor (9), and the loading connecting plate (3) and the testing slide carriage (4) cross the stator of the tested linear motor (9);
the movers of the two coreless linear motors (2) for loading are fixed at the bottom of the loading connecting plate (3);
the test slide carriage (4) supports the loading connecting plate (3) through the transmission mechanism (5), so that the loading connecting plate (3) is suspended on the base (1), and in the horizontal direction, the test slide carriage (4) is far away from or near to the loading connecting plate (3) through the transmission mechanism (5) under the action of loading force or the pushing force of a tested motor;
the tension and pressure sensor (6) is connected between the loading connecting plate (3) and the test slide carriage (4).
2. The single slide opposite dragging type linear motor test platform according to claim 1, wherein the loading connecting plate (3) is of a flat plate structure, and the transmission mechanism (5) comprises two sets of sliding sleeve assemblies;
each set of sliding sleeve assembly comprises a sliding column (5-1) and a sleeve (5-2), one end of the sliding column (5-1) is fixedly connected with one end face of the test slide carriage (4), and the other end of the sliding column (5-1) extends into the sleeve (5-2) and is in sliding connection with the sleeve (5-2);
two through holes are arranged between the front end face and the rear end face of the loading connecting plate (3), and the two through holes are respectively embedded with an inherent sleeve (5-2).
3. The single slide opposite dragging type linear motor testing platform according to claim 1 or 2, wherein the loading connecting plate (3) is of a hollowed-out plate-shaped structure.
4. The single slide carriage opposite dragging type linear motor testing platform according to claim 1 is characterized in that two strip-shaped guide rails (1-1) are arranged on a base (1), two coreless linear motors (2) for loading are respectively arranged on two sides of the two strip-shaped guide rails (1-1), and a tested linear motor (9) is arranged between the two strip-shaped guide rails (1-1);
the upper surfaces of the two strip-shaped guide rails (1-1) are used as air floatation surfaces.
5. A single slide opposite drag linear motor testing platform according to claim 4, characterized in that the linear grating (7) comprises a grating ruler (7-1) and a reading head (7-2);
the grating ruler (7-1) is fixed on the side wall of one bar-shaped guide rail (1-1) of the base (1), the reading head (7-2) is on the same side as the grating ruler (7-1), and the reading head (7-2) is fixed on the test slide carriage (4).
6. A single slide counter-towed linear motor testing platform according to claim 4, further comprising 4 crash buffers (8);
the 4 anti-collision buffers (8) are respectively fixed at two ends of two strip-shaped guide rails (1-1) on the base (1).
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