CN217355429U - Gear rack transmission mechanism and transfer device - Google Patents
Gear rack transmission mechanism and transfer device Download PDFInfo
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- CN217355429U CN217355429U CN202123096591.1U CN202123096591U CN217355429U CN 217355429 U CN217355429 U CN 217355429U CN 202123096591 U CN202123096591 U CN 202123096591U CN 217355429 U CN217355429 U CN 217355429U
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Abstract
The application discloses rack and pinion drive mechanism, including the rack and with the gear assembly of rack connection, the gear assembly includes: a driving wheel; and the two driven wheels are in meshed connection with the driving wheel and are symmetrically arranged relative to the driving wheel, the two driven wheels have the same specification and are in meshed connection with the racks, and a connecting line between the center of the driving wheel and the centers of the two driven wheels is a straight line. According to the gear rack transmission mechanism, the driving wheel drives the two driven wheels to reciprocate on the rack, the radial forces applied to the driving wheel by the two driven wheels are equal in magnitude and opposite in direction, the resultant force of the radial forces borne by the driving wheel is zero, the driving wheel and the power shaft are guaranteed to be only stressed by torque and not stressed by the radial forces, premature damage of the driving wheel and the power shaft due to the radial forces is avoided, the stability and the service life of the gear rack transmission mechanism are effectively improved, the structure of the gear rack transmission mechanism is simple, and the assembly is easy. The application also discloses a transfer device with the gear rack transmission mechanism.
Description
Technical Field
The application relates to the technical field of mechanical transmission, in particular to a gear rack transmission mechanism and a transfer device with the same.
Background
At present, a gear rack transmission mechanism is generally used for realizing linear reciprocating motion by using a gear which is separately meshed and connected with a rack. However, during the transmission process between a single gear and a rack, the gear frequently reciprocates on the rack, the gear and the power shaft are subjected to radial force besides torque, the magnitude and the direction of the radial force are changed continuously and alternately, the power shaft and the power source are adversely affected, the power shaft and the power source are damaged prematurely, and the gear-rack transmission mechanism fails.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a rack and pinion transmission mechanism and a transfer apparatus having the rack and pinion transmission mechanism, so as to prevent the power shaft and the power source from being prematurely damaged due to the radial force applied to the gear, and improve the stability and the service life of the rack and pinion transmission mechanism.
The embodiment of the application provides a rack and pinion drive mechanism, including the rack and with the gear assembly that the rack is connected, the gear assembly includes: a driving wheel; and the two driven wheels are in meshed connection with the driving wheel and are symmetrically arranged relative to the driving wheel, the two driven wheels have the same specification and are in meshed connection with the rack, and a connecting line between the center of the driving wheel and the centers of the two driven wheels is a straight line.
In some embodiments, the gear assembly satisfies the following relationship: z 1 +Z 2 11 t; wherein Z is 1 Is the number of teeth of the driving wheel, Z 2 T is any positive integer for each driven wheel tooth number.
In some embodiments, the number of teeth Z of the drive wheel 1 20, the number of teeth Z of each driven wheel 2 Is 24.
In some embodiments, the gear assembly satisfies the following relationship: z 1 +Z 2 710 t; wherein Z is 1 Is the number of teeth of the driving wheel, Z 2 T is any positive integer for each driven wheel tooth count.
The embodiment of the present application further provides a transfer device, which is used for transferring workpieces, and includes: a base; the shifting slide rail is arranged on the base along a first direction; the rack is connected with the transfer sliding rail in a sliding manner; according to the gear rack transmission mechanism, the rack is arranged on the base and is arranged at intervals with the transfer sliding rail, and the driving wheel and the two driven wheels are both rotatably arranged on the rack; the transfer driving part is connected with the rack and is rotationally connected with the driving wheel; the clamping jaw assembly is arranged on the rack, is used for clamping or loosening the workpiece and is used for moving the clamped workpiece along with the movement of the rack; the transfer driving part is used for driving the driving wheel to rotate, and then the rack is driven to move along the first direction through the meshed connection of the two driven wheels and the rack.
In some embodiments, the transfer device further comprises a moving component; the moving assembly is arranged between the rack and the clamping jaw assembly and is respectively connected with the rack and the clamping jaw assembly, and the moving assembly is used for driving the clamping jaw assembly to move along a second direction perpendicular to the first direction.
In some embodiments, the moving assembly comprises: the movable slide rail is arranged on the rack along the second direction; the movable transmission part is rotationally arranged on the rack and is arranged at intervals with the movable sliding rail; the movable driving piece is arranged on the rack and is rotationally connected with one end of the movable driving piece; the movable sliding part is connected with the movable transmission part in a sliding manner; and the movable sliding table is connected with the movable sliding part and the movable sliding rail in a sliding manner, and the clamping jaw assembly is connected with the movable sliding table.
In some embodiments, the jaw assembly comprises: a base plate connected with the moving assembly; the clamping jaw driving piece is arranged on the substrate and provided with two output ends; the clamping jaw sliding rail is arranged on the substrate along the first direction; the first clamping jaw and the second clamping jaw are respectively connected with the two output ends of the clamping jaw driving piece and are both connected with the clamping jaw sliding rail in a sliding manner; the clamping jaw driving piece is used for driving the first clamping jaw and the second clamping jaw to move close to or away from each other along the first direction so as to clamp or release the workpiece.
In some embodiments, an end of the first jaw remote from the jaw driver is provided with a first clamping portion provided with a first guide and/or a first resilient member; one end, far away from the clamping jaw driving piece, of the second clamping jaw is provided with a second clamping part opposite to the first clamping part, and the second clamping part is provided with a second guide piece and/or a second elastic piece.
In some embodiments, the jaw drive is a double-ended linear cylinder.
According to the gear rack transmission mechanism and the transfer device, the two driven wheels are symmetrically arranged on two sides of the driving wheel, a connecting line between the center of the driving wheel and the centers of the two driven wheels is a straight line, the two driven wheels are directly meshed with the rack and are not meshed with the rack, the driving wheel drives the two driven wheels to reciprocate on the rack, the radial forces applied by the two driven wheels to the driving wheel are equal in magnitude and opposite in direction, the resultant force of the radial forces borne by the driving wheel is zero, the driving wheel and the power shaft are guaranteed to be only stressed by torque and not stressed by the radial forces, premature damage of the driving wheel and the power shaft due to the radial forces is avoided, the stability and the service life of the gear rack transmission mechanism and the transfer device are effectively improved, the structure of the gear rack transmission mechanism is simple, and the assembly is easy. The two driven wheels can effectively improve the transmission performance of the gear rack transmission mechanism and the transfer device.
Drawings
Fig. 1 is a schematic perspective view of a rack and pinion mechanism according to some embodiments of the present disclosure.
Fig. 2 is a force analysis diagram of the rack and pinion mechanism shown in fig. 1.
Fig. 3 is a schematic view showing the meshing analysis of the rack and pinion mechanism shown in fig. 1.
Fig. 4 is a schematic perspective view of a transfer device according to some embodiments of the present application.
Fig. 5 is an exploded schematic view of the transfer device shown in fig. 4.
Figure 6 is an exploded view of the jaw assembly shown in figure 5.
Description of the main elements
Rack and pinion drive 10
Rack 11
Rotating part 44
Jaw assembly 60
Jaw drive 62
Jaw slide 63
Jaw slide 66
Jaw connector 67
Moving assembly 70
Moving slide 74
Movable sliding table 75
Movable connecting piece 77
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, it is to be noted that the meaning of "a plurality" is two or more unless specifically defined otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be mechanically coupled, electrically coupled, or in communication with each other, directly coupled, or indirectly coupled through intervening media, in which case they may be interconnected, or in which case they may be in an interconnecting relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise direct contact between the first and second features through another feature in between. Also, the first feature "on," "above" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal thickness of the first feature is higher than that of the second feature. A first feature "under," "below," and "beneath" a second feature includes a first feature that is directly under and obliquely below the second feature, or simply means that the first feature is less horizontally thick than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
The embodiment of the application provides a rack and pinion drive mechanism, including the rack and with the gear assembly that this rack is connected, this gear assembly includes: a driving wheel; and the two driven wheels are in meshed connection with the driving wheel and are symmetrically arranged relative to the driving wheel, the two driven wheels have the same specification and are in meshed connection with the rack, and a connecting line between the center of the driving wheel and the centers of the two driven wheels is a straight line.
The embodiment of the present application further provides a transfer device, which is used for transferring workpieces, and includes: a base; the shifting slide rail is arranged on the base along a first direction; the rack is connected with the shifting slide rail in a sliding way; according to the gear rack transmission mechanism, the rack is arranged on the base and is arranged at intervals with the shifting slide rail, and the driving wheel and the two driven wheels are both rotatably arranged on the rack; a transfer driving part connected with the frame and rotationally connected with the driving wheel; the clamping jaw assembly is arranged on the rack, is used for clamping or loosening the workpiece and is used for transferring the clamped workpiece along with the movement of the rack; the shifting driving part is used for driving the driving wheel to rotate, and then the rack is driven to move along the first direction through the meshed connection of the two driven wheels and the rack.
The gear rack transmission mechanism and the transfer device provided by the embodiment of the application are characterized in that two driven wheels are symmetrically arranged on two sides of a driving wheel, a connecting line between the center of the driving wheel and the centers of the two driven wheels is a straight line, the two driven wheels are directly meshed with a rack and are not meshed with the rack, the driving wheel drives the two driven wheels to reciprocate on the rack, the radial forces applied to the driving wheel by the two driven wheels are equal in magnitude and opposite in direction, the resultant force of the radial forces borne by the driving wheel is zero, the driving wheel and a power shaft are guaranteed to be only stressed by torque and not stressed by the radial forces, premature damage of the driving wheel and the power shaft due to the radial forces is avoided, the stability and the service life of the gear rack transmission mechanism are effectively improved, the structure of the gear rack transmission mechanism is simple, and the assembly is easy.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.
In the related art, utility model patent CN207161648U discloses a gapless floating gear rack transmission, include: the device comprises a gear seat, a rack, a machine seat and a sliding unit; the gear seat is fixed on the sliding block of the sliding unit, and the rack and the sliding seat of the sliding unit are respectively and independently fixed on the machine base; the gear seat is composed of a spring, a working gear, an adjusting screw, a driving gear, a motor and a connecting rod, wherein the working gear and the connecting rod are respectively 2 pieces, the motor is fixed on the seat body of the gear seat, the driving gear is coaxially driven by a motor output shaft, the working gear is arranged on the connecting rod and is meshed with the driving gear, and the working gear is meshed with the rack in a floating way under the action of the spring force by the connecting rod rotating around the motor output shaft; the contact force of the working gear and the rack is changed by the adjusting screw to change the pretightening force of the spring, so that the overload protection of the movement is realized; the connecting rod is provided with at least 2 round holes, the center distance of the holes ensures the center distance of the meshing of the working gear and the driving gear, and one hole on the connecting rod is coaxial with the driving gear; the spring is movably connected with the adjusting screw and the connecting rod; after the connecting rod is installed, the included angle beta between the central connecting line of the 2 round holes and the moving direction of the sliding block is within +/-10 degrees. In the patent publication, a driving gear is engaged with two working gears, the two working gears are symmetrical about the driving gear, the two working gears are in floating engagement with a rack under the action of a spring force through a connecting rod, an included angle beta between a central connecting line of 2 round holes and the moving direction of a sliding block is within-10 degrees to 10 degrees, including 0 degree, and when the included angle beta between the central connecting line of 2 round holes and the moving direction of the sliding block is 0 degree, a connecting line between the center of the driving gear and the centers of the two working gears is a straight line. It can be understood that the connection line of the center of the driving gear and the centers of the two working gears is a straight line, and the connection is realized under the cooperation of the spring, the adjusting screw and the connecting rod. However, in the patent publication, two working gears need to be respectively engaged with the driving gear and the rack through a connecting rod and a spring, the working gears and the rack in the rack-and-pinion transmission device are in floating engagement, and the two working gears cannot be guaranteed to be always symmetrically arranged with respect to the driving gear, it can be understood that, when an included angle β between a central connecting line of one of the working gears and the driving gear and a moving direction of the slider is 0 °, an included angle β between a central connecting line of the other working gear and the driving gear and the moving direction of the slider is not necessarily 0 °, which results in a poor transmission effect of the rack-and-pinion transmission device, and the magnitude direction of the radial force applied to the driving gear is still constantly and alternately changed, which still can generate adverse effects on the power shaft and the power source, leading to premature damage of the power shaft and the power source, so that the rack-and-pinion transmission device fails.
Referring to fig. 1, some embodiments of the present application provide a rack and pinion mechanism 10. The rack and pinion gear 10 can be applied to a device performing linear motion, such as a linear module. The rack and pinion mechanism 10 includes a rack 11 and a pinion assembly 12 connected to the rack 11. The gear assembly 12 includes a drive pulley 121 and two driven pulleys 122.
The two driven wheels 122 are meshed with the driving wheel 121 and are symmetrically arranged relative to the driving wheel 121, the two driven wheels 122 have the same specification and are both meshed with the rack 11, and a connecting line between the center of the driving wheel 121 and the centers of the two driven wheels 122 is a straight line. Therefore, when the driving wheel 121 drives the two driven wheels 122 to reciprocate on the rack 11, a connecting line between centers of the two driven wheels 122 and the center of the driving wheel 121 is a straight line, so that the two driven wheels 122 are always symmetrically arranged about the driving wheel 121, radial forces applied to the driving wheel 121 by the two driven wheels 122 are always equal in magnitude and opposite in direction, a resultant force of the radial forces borne by the driving wheel 121 is always zero, it is ensured that the driving wheel 121 and a power shaft connected with the driving wheel 121 are only subjected to torque and are not subjected to the radial force, premature damage of the driving wheel 121 and the power shaft due to the radial force is avoided, the stability and the service life of the rack-and-pinion transmission mechanism 10 are effectively improved, and the rack-and-pinion transmission mechanism 10 is simple in structure, low in cost and easy to assemble. The two driven wheels 122 can effectively improve the transmission performance of the rack and pinion transmission mechanism 10.
To facilitate the analysis of the stress of the rack-and-pinion transmission mechanism 10, please refer to fig. 2, two driven wheels 122 are symmetrically disposed on two sides of the driving wheel 121, where the driving wheel 121 is O 1 Gear, two driven wheels 122 are O respectively a Gear and O b The diameter of the driven wheel 122 is larger than that of the driving wheel 121, and the two driven wheelsThe driving wheels 122 are all meshed with the driving wheel 121 and are all meshed with the racks 11. The driving wheel 121 is at a driving torque T 1 Rotates under the action of the driving wheel 121, and the two driven wheels 122 generate meshing pressure F 1 And two engagement pressures F 1 The two driven wheels 122 have zero radial resultant force applied to the driving wheel 121, and can effectively protect the driving wheel 121 and a power shaft connected with the driving wheel 121. Since the driven wheels 122 do not generate driving torque, the engaging pressures of the two driven wheels 122, the rack 11 and the driving wheel 121 are equal, i.e. O, due to the torque balance a The meshing pressure applied to the driving wheel 121 and the rack 11 by the gear is F a ，O b The meshing pressure exerted by the gear on the driving wheel 121 and the rack 11 is F b . And F a And F b And F 1 Acting force and reacting force each other, therefore F a ＝F b ＝F 1 . According to the different steering directions, will be at O a Gear and O b Produce radial reaction forces F on the gear respectively a′ And reaction force F b′ Therefore, the two driven wheels 122 bear radial force, so that the driving wheel 121 bears pure torque, and important parts such as the driving wheel 121 and a power shaft are effectively protected. At the same time, the transmission capacity of the dual driven wheels 122 is also increased. Wherein, O 1 The number of teeth of the gear being Z 1 ，O a Gear and O b The number of teeth of the gear is Z 2 。
To facilitate the analysis of the meshing of the rack and pinion mechanism 10, please refer to fig. 3, first, O is set a Gear and O b The gear is placed in a predetermined position in engagement with the rack 11, assuming that O is to be 1 The gear gradually moves upwards from the middle lower part until the gear is O 1 Gear and O a Gear and O b The gear mesh position stops to form triangular transmission when the gear mesh position stops 1 Center of gear and O a Center of gear and O 1 Center of gear and O b The rack and pinion gear 10 may form or approximate a pure torque transmission when the angle between the line connecting the centers of the gears and the direction of movement of the gear assembly 12 is zero or approaches zero. For meshing bars of rack-and-pinion drive 10The analysis was as follows.
Suppose O a The meshing point of the gear and the rack 11 is P a ，P a Corresponding to O 1 The meshing point on the gear is P 1 ，P 1 Corresponds to O b Point of engagement P on gear b ，P b Corresponding to the meshing point P on the rack 11 t The proper meshing conditions for the rack and pinion mechanism 10 should be: p on the rack 11 a 、P t The two points being in the same interdental state, i.e. from P a To P t The number of cross teeth of (2) is an integer. For the gear or rack 11, the correct meshing process is to walk through the same number of teeth or arc length. The number of teeth corresponding to the angle a, the angle b and the angle c is set to be N a 、N b 、N c 。
As shown in FIG. 3, O 1 Gear, O a Gear and O b The centers of the gears form an isosceles triangle with base angle a, let O 1 The corresponding tooth number in the gear angle (pi-2 a) region is N 1 ，O a The gear angle ((Pi/2) + a) region corresponds to the number of teeth being N 2 。
Then N is 1 ＝(π-2a)Z 1 /2π。
N 2 ＝((π/2)+a)Z 2 /2π＝(π+2a)Z 2 /4π。
The corresponding tooth number in the range of the angle b and the angle c is N b ＝N c ＝N 1 -N 2 。
The corresponding tooth number in the angle d region is N d ＝N 2 -(N 1 -N 2 )＝2N 2 -N 1 ＝((Z 2 -Z 1 )/2)+a(Z 2 +Z 1 )/π。
Total length of meshing of the rack 11: l-2 (R) 1 +R 2 )cosa＝m(Z 2 +Z 1 )cosa，R 1 Radius of capstan 121, R 2 M is a constant coefficient for the radius of the driven wheel 122.
Gear pitch: p ═ pi m.
Total meshing span number of teeth: n is a radical of t ＝L/P＝(Z 2 +Z 1 )cosa/π。
Then P is a To P t Cross tooth number of (2): k is N t -N d ＝((Z 2 +Z 1 )cosa/π)-((Z 2 -Z 1 )/2)-((Z 2 +Z 1 )a/π)＝((cosa-a)(Z 2 +Z 1 )/π)-((Z 2 -Z 1 )/2)。
The above formula can be modified to (cosa-a)/pi ═ 2K + Z 2 -Z 1 )/2(Z 2 +Z 1 ) Or ((cosa/a) - (a/180)) ((2K + Z) 2 -Z 1 )/2(Z 2 +Z 1 ) A) is in degrees.
In order to properly mesh the driving pulley 121 and the two driven pulleys 122, an appropriate value of a is required, so that K is an arbitrary integer, and the smaller the value of a, the better.
As is clear from the above formula, when a is 0, the left formula is 1/pi, and the right formula is a fraction obtained by operating several integers, so that the above formula is an approximate fraction of 1/pi, and Z is determined 1 、Z 2 K, the right expression is equal to the fraction, the error of the approximation is corrected by a, and the left expression is equal to the fraction, so that a solution can be obtained.
Let ((2K + Z) 2 -Z 1 )/2(Z 2 +Z 1 ))＝N/M。
Can be solved to obtain: z 1 -K＝((M-2N)(Z 1 +Z 2 ))/2M。
Regarding the approximate true score of 1/pi, an approximate value in the case where the denominator value is small is 1/pi-7/22, i.e., M-22 and N-7, and the discriminant ((M-2N) (Z) 1 +Z 2 ))/2M＝2(Z 1 +Z 2 ) And/11 is an integer.
The gear assembly 12 satisfies the relationship: z 1 +Z 2 T is any positive integer, i.e. the sum of the numbers of teeth of the primary pulley 121 and the secondary pulley 122 is a multiple of 11. Exemplarily, Z 1 +Z 2 And may be 44, 55, 66, etc.
From (cosa/pi) - (a/180) ═ 7/22, we can solve: a is 0.0230476048296592 °, which may be approximately zero.
In some embodiments, drive wheel 121Number of teeth Z 1 May be 20, the number of teeth Z of the driven wheel 122 2 And may be 24, so that the number of teeth of the driving pulley 121 and the driven pulley 122 is reasonable.
It will be appreciated that in other embodiments, an approximation for an approximate true score of 1/pi, where the denominator values are not large, is 1/pi-113/355, i.e., M-355, N-113, and the discriminant ((M-2N) (Z) in other embodiments 1 +Z 2 ))/2M＝129(Z 1 +Z 2 ) And/710 is an integer.
The gear assembly 12 satisfies the relationship: z 1 +Z 2 T is any positive integer, i.e. the sum of the numbers of teeth of primary pulley 121 and secondary pulley 122 is a multiple of 710. Exemplarily, Z 1 +Z 2 May be 2840, 3550, 4260, etc.
From (cosa/pi) - (a/180) ═ 113/355, we can solve: a is 0.0000048651947904 deg., where a is approximately zero.
It is understood that in other embodiments, Z 1 +Z 2 It may also be 358t, 380t, 402t, 424t, 446t, 468t, 490t, 512t, 534t, 556t, 578t, 600t, 622t, 644t, 666t, 688t, 26259t, 47559t, etc.
Referring to fig. 4, some embodiments of the present application provide a transfer apparatus 100. The transfer device 100 is used for transferring a workpiece (not shown). The transfer device 100 includes a base 20, a transfer slide 30, a frame 40, the rack-and-pinion transmission mechanism 10, a transfer driving member 50, and a gripper assembly 60.
The base 20 is, for example, substantially plate-shaped, and in other embodiments, may be designed in other shapes as desired. The transfer slide 30 is disposed on the base 20 along the first direction. The rack 40 is slidably connected to the transfer slide 30. The rack 11 of the rack and pinion transmission mechanism 10 is disposed on the base 20 and spaced from the transfer slide rail 30, the rack 11 is disposed parallel to the transfer slide rail 30, and the driving wheel 121 and the two driven wheels 122 are both rotatably disposed on the frame 40. The transfer driving member 50 is connected to the frame 40 and rotatably connected to the driving wheel 121, and an output shaft of the transfer driving member 50 may be understood as a power shaft connected to the driving wheel 121. The jaw assembly 60 is disposed on the frame 40, the jaw assembly 60 is used for clamping or unclamping a workpiece, and the jaw assembly 60 is used for transferring the workpiece clamped by the jaw assembly 60 along with the frame 40 moving along a first direction. The transfer driving member 50 may be a servo motor, and the transfer driving member 50 is configured to drive the driving wheel 121 to rotate, so as to drive the rack 40 to move along the first direction through the engagement connection between the two driven wheels 122 and the rack 11.
Some embodiments provide a transfer apparatus 100, which substantially implements the following steps: the number of teeth of the driving wheel 121 is 20, and the number of teeth of the driven wheel 122 is 24. The transfer driving member 50 drives the driving wheel 121 to rotate, and the two driven wheels 122 are engaged with the rack 11 to drive the rack 40 to move along the first direction, so as to drive the clamping jaw assembly 60 connected with the rack 40 to move to the material taking position. The jaw assembly 60 grips the workpiece in the take off position. The transfer driving member 50 drives the driving wheel 121 to rotate, and drives the clamping jaw assembly 60 to move to the blanking position through the two driven wheels 122, the rack 11 and the frame 40. The jaw assembly 60 releases the workpiece for blanking at the blanking position. Thus, when the driving wheel 121 is driven by the transferring driving member 50, and the driving wheel 121 drives the two driven wheels 122 to reciprocate on the rack 11, a connecting line between centers of the two driven wheels 122 and the center of the driving wheel 121 is a straight line, so that the two driven wheels 122 are always symmetrically arranged with respect to the driving wheel 121, radial forces exerted by the two driven wheels 122 on the driving wheel 121 and an output shaft of the transferring driving member 50 are always equal in magnitude and opposite in direction, so that resultant radial forces borne by the driving wheel 121 and the output shaft of the transferring driving member 50 are always zero, it is ensured that the driving wheel 121 and the output shaft of the transferring driving member 50 are only subjected to torque and are not subjected to radial force, premature damage of the driving wheel 121 and the output shaft of the transferring driving member 50 due to the radial force is avoided, and the stability and the service life of the rack-and-pinion transmission mechanism 10 and the transferring device 100 are effectively improved. The use of two driven wheels 122 also facilitates the ability to lift the transfer drive 50.
For convenience of explanation, the embodiments of the present application define the first direction as the X-axis direction shown in fig. 4. Obviously, the first direction is not limited thereto.
In some embodiments, the transfer device 100 further comprises a moving assembly 70. The moving assembly 70 is disposed between the frame 40 and the clamping jaw assembly 60 and respectively connected to the frame 40 and the clamping jaw assembly 60, and the moving assembly 70 is configured to drive the clamping jaw assembly 60 to move along a second direction perpendicular to the first direction. The second direction is the Y-axis direction as shown in fig. 4. Thus, the moving range of the transfer device 100 can be increased by the moving member 70, which is advantageous for improving the applicability and the application range of the transfer device 100.
It is understood that in other embodiments, the transfer device 100 may further include a Z-axis linear assembly (not shown). The Z-axis linear assembly is disposed between the moving assembly 70 and the clamping jaw assembly 60 and is respectively connected to the moving assembly 70 and the clamping jaw assembly 60, and the Z-axis linear assembly is used for driving the clamping jaw assembly 60 to move along a third direction perpendicular to the first direction and the second direction respectively. The third direction is the Z-axis direction as shown in fig. 4. Thus, the moving assembly 70 drives the Z-axis linear assembly and the clamping jaw assembly 60 to move along the second direction, and the Z-axis linear assembly drives the clamping jaw assembly 60 to move along the third direction. By the moving assembly 70 and the Z-axis linear assembly, the moving range of the transfer device 100 can be increased, which is beneficial to improving the applicability and the application range of the transfer device 100.
Referring to fig. 5, in some embodiments, the frame 40 includes a mounting member 41 and a carrier member 42. The mounting member 41 and the carrier member 42 are each, for example, substantially plate-shaped, and in other embodiments may be designed in other shapes as desired, with the mounting member 41 and the carrier member 42 being vertically connected. The mounting member 41 is used for mounting the transfer drive member 50, the driving wheel 121, and the two driven wheels 122. The carrier 42 is used for mounting the moving assembly 70, and the carrier 42 is slidably connected to the transfer slide 30 by the transfer slider 43. In order to ensure the stability of the transfer device 100 during movement, the number of the transfer rails 30 is two, two transfer rails 30 are provided at an interval, and the number of the transfer sliders 43 is four.
It is understood that in other embodiments, the number of the transfer slide 30 may be three or more, and the number of the transfer slide 43 may be five, six or more.
In some embodiments, the driving wheel 121 and the two driven wheels 122 are both rotatably coupled to the mounting member 41 of the frame 40 by bearings.
In some embodiments, the moving assembly 70 includes a moving slide 71, a moving transmission 72, a moving drive 73, a moving slide 74, a moving slide 75, and a moving slider 76.
The carrier 42 is used for carrying a moving slide rail 71, a moving transmission 72, a moving slide 74, a moving slide table 75 and a moving slider 76. The mounting member 41 is used to mount the movable drive member 73. The movable slide rails 71 are disposed on the frame 40 along the second direction, and the number of the movable slide rails 71 is two. The movable transmission member 72 is rotatably disposed on the bearing member 42 of the rack 40 and spaced apart from the movable slide rails 71, and the movable transmission member 72 is located between the two movable slide rails 71. The movable driving member 73 is disposed on the mounting member 41 of the frame 40, and an output end of the movable driving member 73 is rotatably connected to one end of the movable transmission member 72. The moving slide 74 is slidably connected to the moving transmission member 72, and the moving driving member 73 drives the moving transmission member 72 to rotate, so that the moving slide 74 moves along the moving transmission member 72. The moving slide table 75 is connected to the moving slider 74 and is slidably connected to the moving slide 71 through the moving slider 76. The jaw assembly 60 is connected to a moving ramp 75. Therefore, the moving component 70 drives the moving transmission member 72 to rotate, the moving transmission member 72 drives the moving sliding member 74 to slide, and the moving sliding member 74 drives the moving sliding table 75 to move, so as to drive the clamping jaw component 60 to move.
In some embodiments, the moving drive 72 and the moving slide 74 may be ball screw structures. The movable drive 73 may be a servo motor.
It will be appreciated that in other embodiments, the moving assembly 70 may also be a linear air cylinder, with the gripper assembly 60 being connected to the output of the linear air cylinder. In this manner, the gripper assembly 60 can still be moved in the second direction by the linear cylinder.
It is understood that, in some embodiments, both ends of the moving slide table 75 may be connected to the moving slide block 76 through a moving connector 77. In this way, a space for accommodating the moving transmission member 72 and the moving sliding member 74 is formed between the moving slide table 75 and the carrier 42 through the moving connecting member 77.
Although the moving slider 76 is described as a separate component of the moving component 70 juxtaposed to the moving slide table 75, it should be understood that in other embodiments, the moving slider 76 may be a part of the moving slide table 75, that is, the moving slide table may be two parts including the moving slide table 75 and the moving slider 76 as shown in fig. 5, as long as the function of sliding on the moving slide rail 71 can be achieved.
In some embodiments, the frame 40 further includes two rotating portions 43. The two rotating portions 43 are disposed on the bearing member 42 and are respectively connected to two ends of the movable transmission member 72. Both ends of the moving transmission member 72 may be connected to the rotating parts 43 through bearings, respectively.
Referring also to fig. 6, in some embodiments, the jaw assembly 60 includes a base plate 61, a jaw driver 62, a jaw slide 63, a first jaw 64, and a second jaw 65.
The substrate 61 is, for example, substantially plate-shaped, and may be designed in other shapes as needed in other embodiments. The base plate 61 is connected to the moving slide table 75 of the moving assembly 70. The jaw driving member 62 is disposed on the substrate 61, the jaw driving member 62 has two output ends, and the jaw driving member 62 may be a double-headed linear cylinder. The number of the jaw slide rails 63 is, for example, two, and the two jaw slide rails 63 are disposed on the substrate 61 along the first direction and spaced apart from each other. The first clamping jaw 64 and the second clamping jaw 65 are respectively connected with two output ends of the clamping jaw driving piece 62 and are respectively connected with the clamping jaw sliding rail 63 in a sliding mode through a clamping jaw sliding block 66. The jaw driver 62 is configured to drive the first jaw 64 and the second jaw 65 toward and away from each other in a first direction to clamp or unclamp a workpiece. Thus, the clamping jaw assembly 60 can clamp different types of workpieces, and the applicability and the application range of the clamping jaw assembly 60 are increased.
It will be appreciated that in other embodiments, the jaw driving member 62 may further include two linear cylinders, the output ends of the two linear cylinders are respectively connected to the first jaw 64 and the second jaw 65, and the two linear cylinders act synchronously to move the first jaw 64 and the second jaw 65 toward or away from each other along the first direction.
In some embodiments, an end of the first jaw 64 remote from the jaw drive 62 is provided with a first clamping portion 641, an end of the second jaw 65 remote from the jaw drive 62 is provided with a second clamping portion 651 opposite to the first clamping portion 641, and the first clamping portion 641 and the second clamping portion 651 are oppositely arranged to clamp or unclamp a workpiece. The first clamping portion 641 is provided with a first guide 642, and the first guide 642 extends toward the second clamping portion 651. The second clamping portion 651 is provided with a second guide 652, and the second guide 652 extends toward the first clamping portion 641. In this way, through the first clamping portion 641, the first guide 642, the second clamping portion 651 and the second guide 652, when the clamping jaw assembly 60 clamps a workpiece, the workpiece can be precisely clamped through the guiding action of the first guide 642 and the second guide 652, which is beneficial to improving the grabbing precision of the clamping jaw assembly 60.
It is understood that in other embodiments, the first clamping portion 641 may further be provided with a first elastic member (not shown), and the second clamping portion 651 may further be provided with a second elastic member (not shown). The first elastic member and the second elastic member may be springs, rubber, or other elastic members. So, through first elastic component and second elastic component, damage the work piece when avoiding clamping jaw assembly 60 to press from both sides tight work piece is favorable to protecting the outward appearance of work piece.
It is understood that in other embodiments, the first clamping portion 641 may be provided with the first elastic member and the first guide 642 at the same time, and the second clamping portion 651 may be provided with the second elastic member and the second guide 652 at the same time. In the first direction, the first guide 642 protrudes from the first elastic member relative to the first clamping portion 641, and the second guide 652 protrudes from the second elastic member relative to the second clamping portion 651. Thus, when the clamping jaw assembly 60 clamps a workpiece, the first guide part 642 and the second guide part 652 are used for guiding the workpiece, and then the first elastic part and the second elastic part are used for buffering the workpiece, so that the clamping jaw assembly 60 can be ensured to clamp the workpiece accurately and avoid damaging the workpiece.
It is understood that in other embodiments, the first elastic member may protrude or be flush with the first guide member 642 relative to the first clamping portion 641, and the second elastic member may protrude or be flush with the second guide member 652 relative to the second clamping portion 651. In this way, the first guide 642, the first elastic member, the second guide 652 and the second elastic member enable the clamping jaw assembly 60 to clamp the workpiece accurately while avoiding damage to the workpiece.
It will be appreciated that when the transfer device 100 further includes a Z-axis linear assembly, the jaw assembly 60 may further include a jaw connector 67. The clamping jaw connecting piece 67 is connected with the movable sliding table 75, and the Z-axis linear assembly is arranged on the clamping jaw connecting piece 67 and connected with the base plate 61. In this way, other parts of the chuck jaw assembly 60 such as the substrate 61 are driven to move along the third direction by the Z-axis linear assembly. It is clear that the base plate 61 can also be directly connected to the jaw connection 67.
The transfer device 100 provided in the embodiment of the present application, through the cooperation between the transfer driving member 50, the rack and pinion transmission mechanism 10, the moving assembly 70, and the clamping jaw assembly 60, has a wide moving range of the transfer device 100, strong applicability, and a wide application range, and can transfer workpieces in a large area. By symmetrically arranging the two driven wheels 122 on the two sides of the driving wheel 121, the resultant force of the radial force applied to the driving wheel 121 and the output shaft of the transfer driving member 50 is zero, premature damage of the driving wheel 121 and the output shaft of the transfer driving member 50 due to the radial force is avoided, and the stability and the service life of the rack-and-pinion transmission mechanism 10 and the transfer device 100 are effectively improved. Through the two driven wheels 122, the rack and pinion transmission mechanism 10 and the transfer device 100 have strong transmission capability, and are suitable for transferring workpieces with large loads, thereby being beneficial to improving the applicability and the application range of the transfer device 100.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.
Claims (10)
1. A rack and pinion drive comprising a rack and a pinion assembly connected to the rack, the pinion assembly comprising:
a driving wheel; and
the two driven wheels are in meshed connection with the driving wheel and are symmetrically arranged relative to the driving wheel, the two driven wheels have the same specification and are in meshed connection with the rack, and a connecting line between the center of the driving wheel and the centers of the two driven wheels is a straight line.
2. The rack and pinion drive of claim 1,
the gear assembly satisfies the following relationship:
Z 1 +Z 2 11 t; wherein,
Z 1 is the number of teeth of the driving wheel, Z 2 T is any positive integer for each driven wheel tooth number.
3. The rack and pinion drive of claim 2,
the number of teeth Z of the driving wheel 1 20, the number of teeth Z of each driven wheel 2 Is 24.
4. The rack and pinion drive of claim 1,
the gear assembly satisfies the following relationship:
Z 1 +Z 2 710 t; wherein,
Z 1 is the number of teeth of the driving wheel, Z 2 T is any positive integer for each driven wheel tooth number.
5. A transfer device for transferring a workpiece, comprising:
a base;
the shifting slide rail is arranged on the base along a first direction;
the rack is connected with the transfer sliding rail in a sliding manner;
the gear rack transmission mechanism according to any one of claims 1 to 4, wherein the rack is arranged on the base and is spaced from the transfer slide rail, and the driving wheel and the two driven wheels are both rotatably arranged on the frame;
the transfer driving part is connected with the rack and is rotationally connected with the driving wheel; and
the clamping jaw assembly is arranged on the machine frame, is used for clamping or loosening the workpiece and is used for transferring the clamped workpiece along with the movement of the machine frame; wherein,
the transfer driving part is used for driving the driving wheel to rotate, and then the rack is driven to move along the first direction through the meshed connection of the two driven wheels and the rack.
6. The transfer device according to claim 5,
the transferring device also comprises a moving component;
the moving assembly is arranged between the rack and the clamping jaw assembly and is respectively connected with the rack and the clamping jaw assembly, and the moving assembly is used for driving the clamping jaw assembly to move along a second direction perpendicular to the first direction.
7. The transfer device according to claim 6,
the moving assembly includes:
the movable slide rail is arranged on the rack along the second direction;
the movable transmission part is rotationally arranged on the rack and is arranged at intervals with the movable sliding rail;
the movable driving piece is arranged on the rack and is rotationally connected with one end of the movable driving piece;
the movable sliding part is connected with the movable transmission part in a sliding manner; and
the movable sliding table is connected with the movable sliding part and the movable sliding rail in a sliding manner, and the clamping jaw assembly is connected with the movable sliding table.
8. The transfer apparatus according to claim 6,
the jaw assembly includes:
a base plate connected with the moving assembly;
the clamping jaw driving piece is arranged on the substrate and provided with two output ends;
the clamping jaw sliding rail is arranged on the substrate along the first direction;
the first clamping jaw and the second clamping jaw are respectively connected with the two output ends of the clamping jaw driving piece and are both connected with the clamping jaw sliding rail in a sliding manner; wherein,
the clamping jaw driving piece is used for driving the first clamping jaw and the second clamping jaw to mutually approach or separate along the first direction so as to clamp or release the workpiece.
9. The transfer device according to claim 8,
one end of the first clamping jaw, which is far away from the clamping jaw driving part, is provided with a first clamping part, and the first clamping part is provided with a first guide part and/or a first elastic part;
one end, far away from the clamping jaw driving piece, of the second clamping jaw is provided with a second clamping part opposite to the first clamping part, and the second clamping part is provided with a second guide piece and/or a second elastic piece.
10. The transfer device according to claim 8,
the clamping jaw driving piece is a double-end linear cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123096591.1U CN217355429U (en) | 2021-12-10 | 2021-12-10 | Gear rack transmission mechanism and transfer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123096591.1U CN217355429U (en) | 2021-12-10 | 2021-12-10 | Gear rack transmission mechanism and transfer device |
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| Publication Number | Publication Date |
|---|---|
| CN217355429U true CN217355429U (en) | 2022-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123096591.1U Active CN217355429U (en) | 2021-12-10 | 2021-12-10 | Gear rack transmission mechanism and transfer device |
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| CN (1) | CN217355429U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117342193A (en) * | 2023-12-05 | 2024-01-05 | 广州田嘉工业装备有限公司 | Transfer equipment and workpiece transfer method |
| CN117549072A (en) * | 2024-01-10 | 2024-02-13 | 东莞市环力智能科技有限公司 | Automatic assembly device and automatic assembly system for miniature gears |
-
2021
- 2021-12-10 CN CN202123096591.1U patent/CN217355429U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117342193A (en) * | 2023-12-05 | 2024-01-05 | 广州田嘉工业装备有限公司 | Transfer equipment and workpiece transfer method |
| CN117342193B (en) * | 2023-12-05 | 2024-02-23 | 广州田嘉工业装备有限公司 | Transfer equipment and workpiece transfer method |
| CN117549072A (en) * | 2024-01-10 | 2024-02-13 | 东莞市环力智能科技有限公司 | Automatic assembly device and automatic assembly system for miniature gears |
| CN117549072B (en) * | 2024-01-10 | 2024-03-26 | 东莞市环力智能科技有限公司 | Automatic assembly device and automatic assembly system for miniature gears |
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