Linear motion mechanism

Abstract

The utility model discloses a linear motion mechanism which comprises a section bar main body, a driving end plate, a supporting end plate, a driving assembly, a linear guide rail, a base and a sliding block, the section bar main body is made of an extruded aluminum section bar, a top groove is formed in the center of the top face of the section bar main body in a full-length mode, and full-length installation grooves are formed in the other faces of the section bar main body. The linear guide rail is installed in the top groove through screws in a full-length mode, the sliding block is connected to the linear guide rail in a matched and sliding mode, the base is installed on the top face of the sliding block, and a work piece is installed on the base. The two ends of the sectional material body are connected with the driving end plate and the supporting end plate through bolts correspondingly, and the driving assembly is arranged on the driving end plate and the supporting end plate and can drive the sliding block to do reciprocating linear motion along the linear guide rail. The linear motion mechanism is compact in structure, small in occupied space and convenient to install in place, and meanwhile cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical structures, in particular to a linear motion mechanism. Background Art

[0002] In the process of improving the blown film equipment for making plastic bags, the applicant needs to control the width of the blown film, so it is necessary to use a plastic bag film edge detection sensor to track the edge position of the plastic bag film. Therefore, it is necessary to use a linear drive mechanism to carry the edge detection sensor to perform reciprocating linear motion in the width direction of the plastic bag film.

[0003] Although existing linear motors, lead screws and sliders, hydraulic cylinders with guide rails and other methods can achieve similar functions. However, the linear motor, lead screw and slider method has the problem of high cost, the control accuracy of the hydraulic cylinder with guide rails is low, and an additional pump station is required. Moreover, the above methods have poor integration effect, occupy a large space, and are not easy to install on the frame of the existing film blowing machine.

[0004] Therefore, it is necessary to develop a linear motion mechanism to address the above defects. Utility Model Content

[0005] The utility model aims to provide a linear motion mechanism with compact structure, small space occupation, convenient installation and reduced cost.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The utility model provides a linear motion mechanism, comprising a profile body, a driving end plate, a supporting end plate, a driving assembly, a linear guide rail, a base and a slider. The profile body is made of an extruded aluminum profile, a top groove is provided in the center of the top surface of the profile body and other surfaces are provided with through-length mounting grooves; the linear guide rail is installed in the top groove through screws, the slider is slidably connected to the linear guide rail, the base is installed on the top surface of the slider, and a working piece is installed on the base; the two ends of the profile body are respectively connected to the driving end plate and the supporting end plate by bolts, the driving assembly is arranged on the driving end plate and the supporting end plate and can drive the slider to reciprocate linearly along the linear guide rail.

[0008] Furthermore, the driving assembly includes a motor, a driving pulley, a synchronous belt and a driven pulley, the motor is installed on the bottom surface of the driving end plate, the motor output shaft is installed with the driving pulley, and the central axis of the driven pulley is fixed in the middle position of the top surface of the supporting end plate; the synchronous belt is arranged parallel to the linear guide rail and is transmission-connected between the driving pulley and the driven pulley, and the synchronous belt drives the slider.

[0009] Furthermore, the base includes a bottom plate and a cover plate, and the cover plate is fastened to the bottom plate by screw connection; a clearance groove and a break groove are arranged in the middle of the bottom plate and the cover plate along the direction in which the synchronous belt passes, the gap of the synchronous belt passes through the clearance groove, and the two ends of the synchronous belt are fixedly connected in the break groove.

[0010] Furthermore, it also includes a holding belt, the debonding groove is a slot that is wide in the middle and narrow at both ends, the two ends of the synchronous belt are butt-jointedly arranged in the debonding groove, and the holding belt is a section of belt with the same specifications as the synchronous belt; the holding belt is clamped in the widened slot, and the tooth surface of the holding belt and the tooth surfaces of the two ends of the synchronous belt are buckled together.

[0011] Furthermore, a positioning groove is provided in the middle of the bottom surface of the top groove, and the bottom end of the linear guide rail is embedded in the positioning groove for installation.

[0012] Furthermore, the mounting hole of the driving end plate that cooperates with the motor mounting bolt is set as a waist-shaped hole, and the long side direction of the waist-shaped hole is along the guiding direction of the linear guide rail.

[0013] Furthermore, it also includes a first proximity switch, which is fixed to the outer side wall of the profile body by bolts installed in the mounting groove of the side wall of the profile body, and two of the first proximity switches are respectively arranged at both ends of the profile body; a cantilever screw is arranged on the side wall of the base, and the cantilever screw pushes the contact swing arm of the first proximity switch, and the first proximity switch transmits a signal to the equipment control system.

[0014] Furthermore, it also includes a second proximity switch, which is fixed to the outer side wall of the profile body by bolts installed in the mounting groove of the side wall of the profile body, and two second proximity switches are respectively arranged at the two ends of the profile body; the second proximity switch is located on the inner side of the first proximity switch and transmits signals to the equipment control system.

[0015] Compared with the prior art, the beneficial technical effects of the utility model are:

[0016] The practical linear motion mechanism uses customized aluminum profiles as the base material for the installation of the linear guide rail, which not only has good rigidity and high straightness, but also has a compact structure and small space occupation by setting the top groove embedded installation type of the linear guide rail. At the same time, the full-length installation groove of the aluminum profile is convenient for installation to the required position by setting bolts. The setting of the linear guide rail and the slider has good rigidity and strong stability compared to the guide rod guiding method. The linear motion mechanism of the utility model has a compact structure and occupies a small space, which is convenient for installation in place and also reduces the cost.

[0017] In addition, by setting a motor to drive the synchronous belt and synchronous pulley, it is easy to realize, and the moving precision is well controllable. By adopting a synchronous belt enclosed by a straight belt, it is convenient to flexibly adjust the length of the synchronous belt, and there is no need to customize a full circle of synchronous belt of specific specifications, which is low in cost. By holding the two ends of the synchronous belt with the belt teeth, the ends of the synchronous belt can be better fixed, and it is not easy to pull and lose the moving precision. By adding positioning grooves, it is convenient to quickly and accurately install the linear guide rail to avoid the deviation error of the linear guide rail. By setting a waist-shaped hole to install the motor, the forward or backward motor installation position can be achieved when adjusting the tightness of the synchronous belt. By adding a first proximity switch at both ends of the profile body, the limit position signal of the base movement can be transmitted to the equipment control system, and an emergency stop can be achieved to avoid overshooting and pulling the synchronous belt. By setting the second proximity switch on the inner side of the first proximity switch, the signal of the approaching limit position can be transmitted to the equipment control system, and the deceleration action can be achieved to ensure that there is no overshoot during emergency stop. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the linear motion mechanism of the utility model;

[0020] Figure 2 This is a schematic diagram of the main structure of the linear motion mechanism of the utility model;

[0021] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of the middle AA part;

[0022] Figure 4 This is a schematic diagram of the structure of the utility model when the base is removed from the cover plate;

[0023] Figure 5 It is a schematic diagram of the main structure of another specific implementation method of the linear motion mechanism of the utility model.

[0024] Explanation of the reference numerals: 1. Profile body; 101. Top groove; 2. Driving end plate; 201. Waist-shaped hole; 3. Support end plate; 4. Motor; 5. Driving pulley; 6. Synchronous belt; 601. Holding belt; 7. Driven pulley; 8. Linear guide; 9. Base; 901. Bottom plate; 902. Cover plate; 903. Give way groove; 904. Breaking groove; 905. Cantilever screw; 10. Slider; 11. First proximity switch; 111. Contact swing arm; 12. Second proximity switch. DETAILED DESCRIPTION

[0025] The core of the utility model is to provide a linear motion mechanism with a compact structure, small space occupation, easy installation and reduced cost.

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0028] Referring to the accompanying drawings, Figure 1 is a three-dimensional structural schematic diagram of the linear motion mechanism of the present utility model; Figure 2 is a front-view structural schematic diagram of the linear motion mechanism of the present utility model; Figure 3 is Figure 2 a cross-sectional structural schematic diagram of the A-A part in

[0029] Figure 4 is a top-view structural schematic diagram of the base part of the present utility model after removing the cover plate; Figure 5 is a front-view structural schematic diagram of another specific embodiment of the linear motion mechanism of the present utility model.

[0030] In a specific embodiment, as Figures 1 to 5 shown, the linear motion mechanism of the present utility model includes a profile main body 1, a driving end plate 2, a supporting end plate 3, a driving assembly, a linear guide rail 8, a base 9, and a slider 10. The profile main body 1 is an extruded aluminum profile. A top groove 101 is provided in the middle and along the entire length on the top surface of the profile main body 1, and through installation grooves are provided on other surfaces along the entire length. It should be noted that the cross-section of the aluminum profile in this application is as Figure 3As shown, it is not an aluminum profile of common specifications on the market. It is customized by the applicant according to his actual situation, and the aluminum profile manufacturer is required to make an extrusion molding die separately according to the design requirements. The linear guide 8 is installed in the top groove 101 through screws, and the slider 10 is a ball slider and is slidably connected to the linear guide 8. The base 9 is installed on the top surface of the slider 10, and the base 9 is installed with a working piece. In a specific embodiment, the working piece is a plastic bag film edge detection sensor. The two ends of the profile body 1 are respectively connected to the driving end plate 2 and the supporting end plate 3 by bolts. The driving assembly is arranged on the driving end plate 2 and the supporting end plate 3 and can drive the slider 10 to reciprocate along the linear guide 8.

[0031] It should be noted that although the purpose of the applicant's invention of this utility model is to modify the film blowing machine and improve the plastic bag film width control accuracy of the film blowing machine, the technical solution of this utility model can be fully applied to other technical fields and can be used in any work environment that requires reciprocating linear motion. Therefore, the description of the film blowing machine part shall not be regarded as limiting the scope of protection of this application.

[0032] The customized aluminum profile is used as the base material for installing the linear guide 8, which not only has good rigidity and high straightness, but also the top groove 101 is set to embed the linear guide 8 to achieve a compact structure and small space. At the same time, the full-length installation groove of the aluminum profile is convenient for installation to the required position by setting bolts. The setting of the linear guide 8 and the slider 10 has good rigidity and strong stability compared to the guide rod guiding method. The linear motion mechanism of the utility model has a compact structure and occupies a small space, is easy to install in place, and also reduces the cost.

[0033] In a specific embodiment of the present invention, Figures 1 to 4 As shown, the driving assembly includes a motor 4, a driving pulley 5, a synchronous belt 6 and a driven pulley 7. The motor 4 is mounted on the bottom surface of the driving end plate 2, the output shaft of the motor 4 is mounted with the driving pulley 5, and the bottom end of the central axis of the driven pulley 7 is fixed in the middle position of the top surface of the supporting end plate 3. The motor 4 is a servo motor or a stepper motor, which is convenient for accurately controlling the output speed. The synchronous belt 6 is arranged parallel to the linear guide 8 and is transmission-connected between the driving pulley 5 and the driven pulley 7, and the synchronous belt 6 drives the slider 10.

[0034] Obviously, the driving assembly can also use a hydraulic motor to drive the driving pulley 5 to rotate, and the synchronous belt 6 and the pulley can also be replaced by a chain and a sprocket. Similar simple replacement methods all fall within the protection scope of the present utility model.

[0035] Specifically, if Figures 1 to 5As shown, the base 9 includes a bottom plate 901 and a cover plate 902, both of which are square plate-shaped. The cover plate 902 is fastened to the bottom plate 901 by screw connections, and there are three connecting screws arranged in the middle position. In the middle of the bottom plate 901 and the cover plate 902, a relief groove 903 and a break head groove 904 are provided along the direction through which the synchronous belt 6 passes. The synchronous belt 6 passes through the relief groove 903 with a gap, that is, the cross-sectional area of the relief groove 903 is larger than that of the synchronous belt 6, and there is no rubbing between the two. The two ends of the synchronous belt 6 are fixedly connected in the break head groove 904. That is to say, the synchronous belt 6 is not a complete circle but is formed by enclosing a straight belt.

[0036] Specifically, as Figure 3 and Figure 4 shown, the linear motion mechanism of the present invention further includes a holding belt 601. The break head groove 904 is a card slot that is wide in the middle and narrow at both ends. The two ends of the synchronous belt 6 are butt-jointed and arranged in the break head groove 904. The holding belt 601 is a section of belt with the same specification as the synchronous belt 6. The holding belt 601 is snap-fitted in the widened card slot, and the tooth surfaces of the holding belt 601 and the two ends of the synchronous belt 6 are buckled together.

[0037] By setting the motor 4 to drive the synchronous belt 6 and the synchronous belt pulley, it is easy to achieve, and the movement accuracy has good controllability. By using a synchronous belt 6 formed by enclosing a straight belt, it is convenient to flexibly adjust the length of the synchronous belt 6, without the need to customize a complete circle synchronous belt of a specific specification, and the cost is low. By using the method of buckling the tooth surfaces of the holding belt 601 to the two ends of the synchronous belt 6, the ends of the synchronous belt 6 can be fixed better, and it is not easy to lose the movement accuracy due to pulling.

[0038] In a specific embodiment of the present invention, as Figure 3 shown, a positioning groove is provided along the entire length at the middle position of the bottom surface of the top groove 101, and the bottom end of the linear guide 8 is embedded in the positioning groove for installation. The width of the positioning groove matches the width of the bottom end of the linear guide 8.

[0039] By adding a positioning groove, it is convenient to quickly and accurately install the linear guide 8, and avoid the error of the linear guide 8 being skewed.

[0040] In a specific embodiment of the present invention, as Figure 1 shown, the mounting holes for the driving end plate 2 to cooperate with the motor 4 installation bolts are set as waist-shaped holes 201, and the long side direction of the waist-shaped holes 201 is along the guiding direction of the linear guide 8.

[0041] By setting the waist-shaped holes 201 to install the motor 4, when adjusting the tightness of the synchronous belt 6, the installation position of the motor 4 can be advanced or retracted.

[0042] In another specific embodiment of the present invention, as Figure 5As described above, the linear motion mechanism of the present utility model further includes a first proximity switch 11. The first proximity switch 11 is fixed to the outer side wall of the profile body 1 by bolts installed in the mounting grooves on the side wall of the profile body 1. Two first proximity switches 11 are respectively arranged at both ends of the profile body 1. A cantilever screw 905 is provided on the side wall of the base 9. The cantilever screw 905 pushes against the contact arm 111 of the first proximity switch 11, and the first proximity switch 11 transmits a signal to the equipment control system.

[0043] Specifically, as Figure 5 described above, the linear motion mechanism of the present utility model further includes a second proximity switch 12. The second proximity switch 12 is fixed to the outer side wall of the profile body 1 by bolts installed in the mounting grooves on the side wall of the profile body 1. Two second proximity switches 12 are respectively arranged at both ends of the profile body 1. The second proximity switch 12 is located inside the first proximity switch 11 and transmits a signal to the equipment control system.

[0044] Specifically, as Figure 5 described above, the second proximity switch 12 specifically adopts an infrared proximity switch.

[0045] By adding the first proximity switches 11 at both ends of the profile body 1, the signal of the extreme position of the movement of the base 9 can be transmitted to the equipment control system, and emergency shutdown can be achieved to avoid overshooting and pulling damage to the synchronous belt 6. By arranging the second proximity switch 12 inside the first proximity switch 11, the signal of approaching the extreme position can be transmitted to the equipment control system, and the deceleration action can be achieved to ensure that there is no overshoot during emergency shutdown.

[0046] The working process of the linear motion mechanism of the present utility model: Taking the application of a blown film machine as an example for description, the equipment control system issues a start signal, the motor 4 works, driving the driving pulley 5 to rotate forward or backward, and the synchronous belt 6 starts to rotate along the entire length direction of the linear guide 8. Since both ends of the synchronous belt 6 are fixedly connected to the break head groove 904, the synchronous belt 6 drives the base 9 to perform reciprocating linear motion on the linear guide 8. Further, the action of the edge detection sensor following the edge of the plastic bag film is realized. When the second proximity switch 12 collects the information that the base 9 has passed by, the equipment control system controls the motor 4 to reduce the speed and realizes the deceleration action of the base 9. When the cantilever screw 905 pushes against the contact arm 111 of the first proximity switch 11, the first proximity switch 11 transmits a signal to the equipment control system, and the equipment control system controls the motor 4 to stop urgently, and the base 9 stops running.

[0047] In summary, for the linear motion mechanism of the present utility model, by using customized aluminum profiles as the base material for the installation of the linear guide rail 8, it not only has good stiffness and high straightness, but also adopts a buried installation of the linear guide rail 8 in the top groove 101 to achieve a compact structure and small occupied space. At the same time, the through installation grooves of the aluminum profiles facilitate the installation to the required positions by setting bolts. Through the setting of the linear guide rail 8 and the slider 10, compared with the guide rod guiding method, it has good stiffness and strong stability. The linear motion mechanism of the present utility model has a compact structure, small occupied space, is convenient for in-place installation, and also reduces costs. In addition, by setting the motor 4 to drive the synchronous belt 6 and the synchronous belt pulley, it is easy to implement and has good controllability of the moving accuracy. By using a synchronous belt 6 formed by enclosing a straight belt, it is convenient to flexibly adjust the length of the synchronous belt 6 without customizing a full-circle synchronous belt of a specific specification, with low cost. By adopting the method of butting the tooth surfaces of the holding belt 601 against the two ends of the synchronous belt 6, the two ends of the synchronous belt 6 can be better fixed and it is not easy to lose the moving accuracy due to pulling. By adding a positioning groove, it is convenient to quickly and accurately install the linear guide rail 8 and avoid the error of the linear guide rail 8 being skewed. By setting the waist-shaped hole 201 to install the motor 4, when adjusting the tightness of the synchronous belt 6, the installation position of the motor 4 can be advanced or retreated. By adding the first proximity switches 11 at both ends of the profile body 1, the signal of the limit position of the movement of the base 9 can be transmitted to the equipment control system and an emergency stop can be achieved to avoid overshooting and pulling the synchronous belt 6. By setting the second proximity switch 12 inside the first proximity switch 11, the signal of approaching the limit position can be transmitted to the equipment control system and a deceleration action can be achieved to ensure that there is no overshoot during the emergency stop.

[0048] In the present specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description in the method part.

[0049] The embodiments described above are only descriptions of the preferred modes of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A linear motion mechanism, characterized in that: The invention comprises a profile body (1), a driving end plate (2), a supporting end plate (3), a driving assembly, a linear guide rail (8), a base (9) and a slider (10); the profile body (1) is made of an extruded aluminum profile; a top groove (101) is provided in the center of the top surface of the profile body (1) and a full-length installation groove is provided on the other surfaces; the linear guide rail (8) is installed in the top groove (101) through screws; the slider (10) is slidably connected to the linear guide rail (8); the base (9) is installed on the top surface of the slider (10); and a working piece is installed on the base (9); the two ends of the profile body (1) are respectively connected to the driving end plate (2) and the supporting end plate (3) by bolts; the driving assembly is arranged on the driving end plate (2) and the supporting end plate (3) and can drive the slider (10) to reciprocate along the linear guide rail (8).

2. The linear motion mechanism according to claim 1, characterized in that: The driving assembly comprises a motor (4), a driving pulley (5), a synchronous belt (6) and a driven pulley (7); the motor (4) is mounted on the bottom surface of the driving end plate (2); the output shaft of the motor (4) is mounted with the driving pulley (5); the central axis of the driven pulley (7) is fixed at the middle position of the top surface of the supporting end plate (3); the synchronous belt (6) is arranged parallel to the linear guide rail (8) and is transmission-connected between the driving pulley (5) and the driven pulley (7); the synchronous belt (6) drives the slider (10).

3. The linear motion mechanism according to claim 2, characterized in that: The base (9) comprises a bottom plate (901) and a cover plate (902), wherein the cover plate (902) is fastened to the bottom plate (901) by means of screws; a clearance groove (903) and a cut-off groove (904) are provided in the middle of the bottom plate (901) and the cover plate (902) along the direction in which the synchronous belt (6) passes through, the synchronous belt (6) passes through the clearance groove (903) in a gap, and the two ends of the synchronous belt (6) are fixedly connected in the cut-off groove (904).

4. The linear motion mechanism according to claim 3, characterized in that: It also includes a holding belt (601), the decapping groove (904) is a slot that is wide in the middle and narrow at both ends, the two ends of the synchronous belt (6) are butt-jointedly arranged in the decapping groove (904), and the holding belt (601) is a belt section with the same specifications as the synchronous belt (6); the holding belt (601) is snapped into the widened slot, and the tooth surface of the holding belt (601) and the tooth surfaces of the two ends of the synchronous belt (6) are buckled together.

5. The linear motion mechanism according to claim 1, characterized in that: A positioning groove is provided at the middle position of the bottom surface of the top groove (101) throughout its length, and the bottom end of the linear guide rail (8) is embedded in the positioning groove for installation.

6. The linear motion mechanism according to claim 2, characterized in that: The mounting hole for the driving end plate (2) and the motor (4) to be matched with the mounting bolt is configured as a waist-shaped hole (201), and the long side direction of the waist-shaped hole (201) is along the guiding direction of the linear guide rail (8).

7. The linear motion mechanism according to claim 1, characterized in that: It also includes a first proximity switch (11), which is fixed to the outer wall of the profile body (1) by bolts installed in the mounting grooves of the side wall of the profile body (1), and two of the first proximity switches (11) are respectively arranged at the two ends of the profile body (1); a cantilever screw (905) is arranged on the side wall of the base (9), and the cantilever screw (905) pushes the contact swing arm (111) of the first proximity switch (11), and the first proximity switch (11) transmits a signal to the equipment control system.

8. The linear motion mechanism according to claim 7, characterized in that: It also includes a second proximity switch (12), which is fixed to the outer wall of the profile body (1) by means of bolts installed in the mounting groove of the side wall of the profile body (1), and two second proximity switches (12) are respectively arranged at the two ends of the profile body (1); the second proximity switch (12) is located on the inner side of the first proximity switch (11) and transmits signals to the equipment control system.

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