Pitch changing mechanism and dispensing coating machine

Abstract

The invention belongs to the technical field of dispensing and coating equipment, and discloses a pitch changing mechanism and a dispensing and coating machine, the pitch changing mechanism comprises a rack, lead screws and an adjusting driving piece, the multiple lead screws are rotatably arranged on the rack in parallel, the thread directions of the lead screws are the same, each lead screw is in threaded connection with a sliding sleeve, and the lead screws are in transmission connection through a transmission assembly; the adjusting driving piece is arranged on the rack and connected with the transmission assembly, and the adjusting driving piece drives the multiple lead screws to rotate at the same time through the transmission assembly. According to the variable-pitch mechanism and the dispensing coating machine comprising the variable-pitch mechanism, the transmission assembly can be used for driving the multiple lead screws to rotate through one adjusting driving piece, the sliding sleeves arranged on the lead screws in the sleeving mode move in the extending directions of the lead screws along with rotation of the lead screws, therefore, the distance between the sliding sleeves and the executing mechanisms connected with the sliding sleeves is adjusted, the adjustable stroke is large, and the working efficiency is improved. And the structure is compact and the occupied space is small.

Description

Technical Field

[0001] The present invention relates to the technical field of glue dispensing and coating equipment, and in particular to a variable distance mechanism and a glue dispensing and coating machine. Background Art

[0002] The pitch-changing mechanism is a mechanical transmission structure that can achieve pitch change. It is often used in various devices that need to adjust the distance between multiple actuators. For example, the pitch-changing mechanism is often used in glue dispensing coating machines to adjust the distance between multiple glue dispensing valves. Existing pitch-changing mechanisms include cam slot pitch-changing mechanisms and scissor-type pitch-changing mechanisms. In the cam slot pitch-changing mechanism, the contact between the cam and the follower is point or line contact, which is prone to wear and noise; while the scissor-type pitch-changing mechanism has a complex structure and occupies a large space. Summary of the invention

[0003] The object of the present invention is to provide a pitch-changing mechanism and a glue dispensing coating machine, so as to solve the problem that the existing pitch-changing mechanism is prone to generate noise or occupy a large space.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] In the first aspect, the present invention provides a pitch changing mechanism, comprising a frame, a screw rod and an adjusting drive member, wherein a plurality of the screw rods are rotatably arranged on the frame, the plurality of the screw rods are arranged in parallel and spaced apart, and the thread directions on the respective screw rods are the same, a sleeve is threadedly connected to the screw rods, and the respective screw rods are connected in transmission via a transmission assembly; the adjusting drive member is arranged on the frame and connected to the transmission assembly, and the adjusting drive member drives the plurality of the screw rods to rotate simultaneously via the transmission assembly.

[0006] Optionally, the transmission assembly includes a driving wheel, a driven wheel and a synchronous belt, the driving wheel is connected to the adjustment drive member, a plurality of driven wheels are connected to the screw rods one by one, and the synchronous belt is wound between the driving wheel and the driven wheel.

[0007] Optionally, the screw rod extends along a first direction, a plurality of the sleeves are equidistantly distributed along the first direction, and when the sleeves move in a positive direction along the first direction, the distance between adjacent sleeves increases, and according to the first direction, the speeds of the sleeves are V1, V2, ..., V m , the speed ratio of the sleeve is V1:V2:...:V m , m≥2, wherein the speed ratio of the sleeve is an arithmetic progression.

[0008] Optionally, the speed ratio between the sliding sleeves (4) is V1:V2:...:V m =1:2:……:m.

[0009] Optionally, the leads of the screw rods connected to the corresponding sleeves are S1, S2, ..., S m The diameters of the driven wheels (52) connected to the corresponding screw rods are d1, d2, ..., d m ,

[0010] When the leads of the screw rods are consistent, the diameters of the driven wheels satisfy the relationship 1 / d1:1 / d2:...:1 / d m =1:2:……:m;

[0011] or

[0012] When the diameters of the driven wheels are the same, the ratios of the leads of the screw rods are S1:S2:...:S m =1:2:……:m.

[0013] Optionally, the driving wheel and the driven wheel are arranged on the same side of the frame.

[0014] Optionally, the transmission assembly further includes a plurality of tension wheels, and the tension wheels abut against the synchronous belt.

[0015] Optionally, the position of the tensioning wheel and / or the adjusting drive member on the frame is adjustable.

[0016] Optionally, the adjusting drive is connected to the frame via a mounting plate, one of the mounting plate and the frame is provided with a strip mounting hole extending in a horizontal direction perpendicular to the extension direction of the screw rod, the other of the mounting plate and the frame is provided with a threaded hole, and the axle of at least one of the tensioning wheels is passed through the strip mounting hole and the threaded hole, and is threadedly connected to the frame.

[0017] Optionally, a plurality of the strip-shaped mounting holes and the threaded holes are arranged at intervals in the height direction of the rack.

[0018] In a second aspect, the present invention provides a dispensing coating machine, comprising the above-mentioned variable distance mechanism, and also comprising a dispensing valve and a lifting drive component, wherein a plurality of the lifting drive components are connected to the dispensing valves in a one-to-one correspondence, and the screw rod is configured to adjust the distance between each adjacent dispensing valve.

[0019] Beneficial effects of the present invention:

[0020] The variable pitch mechanism and glue dispensing coating machine proposed in the present invention can utilize a transmission assembly to realize a plurality of screws being driven to rotate by an adjusting drive member. The sleeve mounted on the screw moves along the extension direction of the screw as the screw rotates, thereby realizing the adjustment of the distance between the actuators connected to the sleeve. The entire variable pitch mechanism is not prone to generate noise during operation, and has a compact structure and occupies little space. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of a glue dispensing coating machine at one angle in an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of the three-dimensional structure of the glue dispensing coating machine in another angle in an embodiment of the present invention;

[0023] Figure 3 is a side view of a glue dispensing coating machine according to an embodiment of the present invention;

[0024] Figure 4 It is a front view of the glue dispensing coating machine in an embodiment of the present invention.

[0025] In the figure:

[0026] 1. Frame; 11. Slide rail; 12. Support plate; 13. Threaded hole; 2. Screw rod; 3. Adjustment drive member; 4. Sleeve; 5. Transmission assembly; 51. Driving wheel; 52. Driven wheel; 53. Synchronous belt; 54. Tensioner; 6. Dispensing valve; 7. Mounting plate; 71. Strip mounting hole; 8. Organ protective cover; 9. Lifting drive member. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] refer to Figure 1-Figure 4 As shown, in this embodiment, a variable distance mechanism and a dispensing coating machine are proposed. The variable distance mechanism can adjust the distance between multiple actuators. The dispensing coating machine includes the above variable distance mechanism and also includes a dispensing valve 6. The dispensing valve 6 is an actuator in the dispensing coating machine. The variable distance mechanism can adjust the distance between adjacent dispensing valves. The actuator can also be a clamp, a welding gun, etc., that is, the variable distance mechanism in this embodiment can be applied to different equipment in multiple fields that require adjusting the distance between actuators, and is not limited to the dispensing coating machine.

[0032] The pitch-changing mechanism comprises a frame 1, an adjusting drive member 3, a screw rod 2, a sleeve 4 and a transmission assembly 5. A plurality of screw rods 2 are rotatably arranged on the frame 1, and the screw rods 2 are arranged in parallel and spaced apart. The screw rods 2 are connected to each other through the transmission assembly 5. The thread directions of the screw rods 2 are the same, and the screw rods 2 are screwed with the sleeve 4. The adjusting drive member 3 is arranged on the frame 1 and connected to the transmission assembly 5. The adjusting drive member 3 drives the plurality of screw rods 2 to rotate simultaneously through the transmission assembly 5. The sleeve 4 can move along the length direction of the screw rod 2 when the screw rod 2 rotates, thereby driving the actuator connected to the sleeve 4 to move.

[0033] The above-mentioned pitch-changing mechanism utilizes a transmission assembly 5 to realize the use of an adjustment drive member 3 to drive multiple screw rods 2 to rotate, thereby causing the sleeve 4 sleeved on the screw rod 2 to move along the length direction of the screw rod 2 as the screw rod 2 rotates, thereby realizing the adjustment of the distance between the actuators connected to the sleeve 4. The entire pitch-changing mechanism is not easy to generate noise, and has a compact structure and occupies a small space. It can be understood that the number of screw rods 2 and the number of driven members connected to the screw rod 2 in the transmission assembly 5 can be adaptively increased or decreased according to the number of actuators to be adjusted.

[0034] In this embodiment, the transmission assembly 5 adopts a pulley transmission structure. Figure 2 and Figure 3 As shown, the transmission assembly 5 includes a driving wheel 51, a driven wheel 52 and a synchronous belt 53. The driving wheel 51 is connected to the adjusting drive member 3. The adjusting drive member 3 adopts a servo motor with high spacing adjustment accuracy. Multiple driven wheels 52 serve as driven members in the transmission assembly 5 and are connected to the screw rods 2 one by one. The synchronous belt 53 is wound between the driving wheel 51 and the driven wheel 52 so that the driven wheel 52 rotates with the driving wheel 51.

[0035] In this embodiment, the screw rod 2 is arranged horizontally in the first direction ( Figure 1 The plurality of sleeves 4 mounted on the screw rods 2 are arranged at intervals along the first direction. When the sleeves 4 move along the first direction under the action of the screw rods 2, the distance between the sleeves 4 increases. When the sleeves 4 move along the first direction under the action of the screw rods 2, the distance between the sleeves 4 decreases. Along the first direction, the speeds of the sleeves 4 are V1, V2, ..., V m , the speed ratio between the sliding sleeves 4 is V1:V2:……:V m , the movement strokes of the sleeve 4 in time t are D1, D2...D m , m≥2. It can be understood that the sleeve 4 is connected to the screw 2 via a screw nut, and therefore, the speed of the sleeve 4 can be understood as the speed of the screw nut.

[0036] In this embodiment, the sleeve 4 can drive the dispensing valve 6 to achieve equidistant variable distance adjustment, that is, the distance between adjacent sleeves 4 (adjacent dispensing valves 6) always remains the same. Then, along the first direction, the moving stroke ratio of each sleeve 4 in the same time is an arithmetic progression, and the moving stroke of the sleeve 4 is equal to the product of speed and time, then the speed ratio of each sleeve 4 is an arithmetic progression.

[0037] Assuming that the initial distance between adjacent sleeves 4 is D, it can be understood that when the dispensing valve 6 is arranged on the pitch-changing mechanism, it includes the following two modes: one is that the dispensing valve 6 is arranged one-to-one with the sleeve 4, that is, multiple dispensing valves 6 all move with the sleeve 4, at this time m≥3; another is that the dispensing valve 6 includes a fixed dispensing valve and multiple mobile dispensing valves, the fixed dispensing valve is fixedly arranged on the frame 1, and multiple mobile dispensing valves are arranged on the same side of the fixed dispensing valve and are spaced apart along the first direction, and multiple mobile dispensing valves are connected to each sleeve 4 one-to-one, at this time, m≥2, and the initial distance between the fixed dispensing valve and the adjacent mobile dispensing valve is D. It can be understood that the fixed dispensing valve means that the dispensing valve does not need to move in the first direction, and the mobile dispensing valve means that the dispensing valve needs to move in the first direction.

[0038] When the dispensing valve 6 includes a fixed dispensing valve and a plurality of movable dispensing valves, D+D1=D-D1+D2=...=DD (m-1) +D m , that is, D1:D2:……:D m =1:2:...m, and D1 = V1t, D2 = V2t,...D m =V m t, then the speed ratio between the sliding sleeves 4 is V1: V2: ...: V m =1:2:……:m.

[0039] On this basis, it is assumed that the leads of the screw rods 2 connected to the corresponding sleeves 4 are S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23, S24, S25, S26, S27, S2 m The diameters of the driven wheels connected to the corresponding screw rods 2 are d1, d2, ..., d m , the diameter of the driving wheel is d, the speed of the driving wheel is n (unit: revolutions / min), corresponding to the speed of the screw 2:

[0040] n1=(d / d1)*n

[0041] n2=(d / d2)*n

[0042] …

[0043] n m =(d / d m )*n

[0044] The corresponding speeds of the sliding sleeve 4 are:

[0045] V1=n1*S1=(d / d1)*n*S1

[0046] V2=n2*S2=(d / d2)*n*S2

[0047] …

[0048] Vm =n m *S m =(d / d m )*n*S m

[0049] The speed ratio of each sliding sleeve 4 must satisfy:

[0050] V1: V2: ...: V m =[(d / d1)*n*S1]:[(d / d2)*n*S2]:……:[(d / d m )*n*S m ]=

[0051] (S1 / d1):(S2 / d2):……(S m / d m )=1:2:……:m;

[0052] When the leads of the screw rods 2 are the same, the diameters of the driven wheels 52 satisfy the relationship 1 / d1:1 / d2:...:1 / d m =1:2:……:m;

[0053] When the diameters of the driven wheels 52 are the same, the ratios of the leads of the screw rods 2 are S1:S2:...:S m =1:2:……:m.

[0054] Of course, it can also be understood that, when a screw rod 2 with a suitable lead cannot be found in some occasions, the equidistant pitch can be achieved by changing the rotation speed of the corresponding driven wheel 52, and the specific setting can be made according to the actual situation.

[0055] In this embodiment, four dispensing valves 6 are provided, of which three are movable dispensing valves, and three screw rods 2 and three sliding sleeves 4 are provided.

[0056] Of course, according to actual needs, non-equidistant variable pitch adjustment can also be achieved between the actuators connected to the sleeve 4, by adjusting the lead of the screw rod 2 and / or adjusting the diameter of the driven wheel 52. In order to meet different pitch adjustment requirements, the driven wheel 52 is detachably connected to the screw rod 2. For example, the driven wheel 52 is connected to the screw rod 2 by a clamp.

[0057] In other embodiments, the transmission assembly 5 may also adopt a gear transmission structure, and the gears are connected to the screw rods 2 as driven parts in a one-to-one correspondence, which will not be described in detail here.

[0058] Specifically, in order to reduce the difficulty of maintenance and reduce the number of synchronous belts 53 used, the driving wheel 51 and the driven wheel 52 are arranged on the same side of the frame 1, and in order to rationally utilize the space, the screw rod 2 is arranged at intervals from top to bottom, and the driven wheel 52 connected to the screw rod 2 is also arranged from top to bottom.

[0059] In order to keep the synchronous belt 53 in a tensioned state, the transmission assembly 5 further includes a plurality of tension wheels 54 , wherein some of the tension wheels 54 abut against the inner side of the synchronous belt 53 , and other tension wheels 54 abut against the outer side of the synchronous belt 53 .

[0060] Specifically, in order to facilitate the adjustment of the tension of the synchronous belt 53, the position of the tensioning wheel 54 and / or the adjusting driving member 3 on the frame 1 is adjustable. Figure 3 As shown, the adjusting drive member 3 is connected to the frame 1 through the mounting plate 7, and one of the mounting plate 7 and the frame 1 is provided with a strip mounting hole 71 extending in a horizontal direction perpendicular to the screw rod 2, and the other is provided with a threaded hole 13, and the axle of one of the tensioning wheels 54 is passed through the strip mounting hole 71 and the threaded hole 13 and is screwed to the frame 1, and the tensioning wheel 54 can cooperate with the frame 1 to clamp the mounting plate 7, eliminating the fasteners used to fix the adjusting drive member 3, and by adjusting the position of the axle of the tensioning wheel 54 in the strip mounting hole 71, the position of the adjusting drive member 3 and the driving wheel 51 connected to the adjusting drive member 3 can be achieved, thereby achieving the adjustment of the tensioning force of the synchronous wheel.

[0061] Optionally, multiple strip-shaped mounting holes 71 and threaded holes 13 are arranged at intervals in the height direction, and the tension of the synchronous belt 53 can be further adjusted by adjusting the height of the tensioning wheel 54. In order to support the adjusting driving member 3 when adjusting the height of the tensioning wheel 54, a support plate 12 is provided on the frame 1, and the adjusting driving member 3 is placed on the support plate 12.

[0062] refer to Figure 4 As shown, in order to improve the stability of the sleeve 4 when it moves axially along the screw rod 2, two slide rails 11 are arranged on the frame 1 at intervals along the height direction. The slide rails 11 are arranged parallel to the screw rod 2, and the screw rod 2 is located between the two slide rails 11. The upper and lower ends of the sleeve 4 are slidably connected to the slide rails 11.

[0063] In this embodiment, the pitch-changing mechanism further includes an accordion protective cover 8, which is disposed between two adjacent sliding sleeves 4, and its two opposite sides are respectively connected to the two sliding sleeves 4, so as to provide effective protection for the screw rod 2 and the sliding sleeve 4. Further, in order to provide effective protection for the adjustment drive 3 and the transmission assembly 5, the pitch-changing mechanism further includes a rigid protective shell, which is disposed outside the transmission assembly 5 and the adjustment drive 3. Specifically, in order to facilitate the inspection or replacement of the transmission assembly 5 and the adjustment drive 3, the rigid protective cover is bolted to the frame 1.

[0064] The glue dispensing coating machine proposed in this embodiment also includes a lifting drive component 9. A plurality of lifting drive components 9 are connected to the glue dispensing valves 6 in a one-to-one correspondence to drive the glue dispensing valves 6 to rise and fall.

[0065] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A pitch-changing mechanism, characterized in that: include: Rack (1); A plurality of screw rods (2) are rotatably arranged on the frame (1), the plurality of screw rods (2) are arranged in parallel and spaced apart, the thread directions of the screw rods (2) are the same, each screw rod (2) is threadedly connected with a sleeve (4), and the screw rods (2) are connected in transmission via a transmission assembly (5); An adjusting drive member (3) is arranged on the frame (1) and connected to the transmission assembly (5); the adjusting drive member (3) drives the plurality of screw rods (2) to rotate simultaneously through the transmission assembly (5).

2. The pitch-changing mechanism according to claim 1, characterized in that: The transmission assembly (5) comprises a driving wheel (51), a driven wheel (52) and a synchronous belt (53); the driving wheel (51) is connected to the adjusting drive member (3); a plurality of driven wheels (52) are connected to the screw rods (2) in a one-to-one correspondence; and the synchronous belt (53) is wound between the driving wheel (51) and the driven wheel (52).

3. The pitch-changing mechanism according to claim 2, characterized in that: The screw rod (2) extends along a first direction, a plurality of the sliding sleeves (4) are equidistantly distributed along the first direction, and when the sliding sleeves (4) move in a positive direction along the first direction, the distance between adjacent sliding sleeves (4) increases, and according to the first direction, the speeds of the sliding sleeves (4) are V1, V2, ..., V m The speed ratio between the sliding sleeves (4) is V1: V2: ...: V m , m≥2, wherein the speed ratio of the sleeve (4) is an arithmetic progression.

4. The pitch changing mechanism according to claim 3, characterized in that: The speed ratio between the sliding sleeves (4) is V1:V2:...:V m =1:2:……:m.

5. The pitch changing mechanism according to claim 4, characterized in that: The leads of the screw rods (2) connected to the corresponding sleeves (4) are S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S30, S31, S32, S33, S34, S35, S36, m The diameters of the driven wheels (52) connected to the corresponding screw rods (2) are d1, d2, ..., d m , When the leads of the screw rods (2) are consistent, the diameters of the driven wheels (52) satisfy the relationship 1 / d1:1 / d2:...:1 / d m =1:2:……:m; or When the diameters of the driven wheels (52) are the same, the ratios of the leads of the screw rods (2) are S1:S2:...:S m =1:2:……:m.

6. The pitch changing mechanism according to claim 2, characterized in that: The driving wheel (51) and the driven wheel (52) are arranged on the same side of the frame (1).

7. The pitch changing mechanism according to claim 2, characterized in that: The transmission assembly (5) further comprises a plurality of tension wheels (54), wherein the tension wheels (54) abut against the synchronous belt (53).

8. The pitch changing mechanism according to claim 7, characterized in that: The position of the tensioning wheel (54) and / or the adjusting drive member (3) on the frame (1) is adjustable.

9. The pitch-changing mechanism according to claim 8, characterized in that: The adjusting drive member (3) is connected to the frame (1) via a mounting plate (7); one of the mounting plate (7) and the frame (1) is provided with a strip-shaped mounting hole (71) extending in a horizontal direction perpendicular to the screw rod (2); the other of the mounting plate (7) and the frame (1) is provided with a threaded hole (13); the axle of at least one of the tensioning wheels (54) is passed through the strip-shaped mounting hole (71) and the threaded hole (13) and is threadedly connected to the frame (1).

10. Glue dispensing coating machine, characterized in that, It comprises the variable pitch mechanism as described in any one of claims 1 to 9, and also comprises a dispensing valve (6) and a lifting drive member (9), wherein a plurality of lifting drives (9) are connected to the dispensing valves (6) in a one-to-one correspondence, and the lead screw (2) is configured to adjust the distance between each adjacent dispensing valve (6) along the length direction of the lead screw (2).

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