A bottom lifting device and tension control mechanism

Abstract

The present invention relates to the technical field of knitting machinery, and more specifically, it relates to a bottom lifting device and tension control mechanism, which includes a nut seat, a limiting structure, a screw rod, a motor for driving the screw rod to rotate, a lifting seat for driving the bottom lifting comb to rise and fall, and a first controller; the nut seat is sleeved on the screw rod, and the limiting structure is used to limit the circumferential position of the nut seat so that the nut seat is driven to rise and fall by the screw rod; an elastic member and a sensor are provided on the lifting seat; wherein the nut seat is used to be driven to drive the lifting seat to rise, and to drive the lifting seat to fall through the elastic member; the sensor is used to be triggered to generate a signal when the deformation of the elastic member exceeds a set value, and the first controller is used to control the motor to slow down or wait according to the signal. According to the technical solution provided by the present invention, it can realize automatic control of the excessively fast descending speed of the bottom lifting comb.

Description

Technical Field

[0001] The invention relates to the technical field of knitting machinery, and in particular to a bottom lifting device and a tension control mechanism. Background Art

[0002] Flat knitting machines are highly technologically advanced automated machines in the knitting machine industry, integrating computer digital control, electronic drive, and mechanical design technologies. Flat knitting machines require a bottom lift before knitting fabrics, and currently, the fabrics are generally lifted using a bottom lift device.

[0003] The existing bottoming device includes a bottoming comb, a lifting seat, a screw rod and a motor. The lifting seat is connected to the bottoming comb, and the lifting seat has a threaded hole. The lifting seat is sleeved on the screw rod through the threaded hole. The lifting seat cooperates with the screw rod to form a screw nut mechanism. The motor is used to drive the screw rod to rotate, and the screw rod drives the lifting seat to lift and lower. Among them, the bottoming comb has a bottoming needle, and the bottoming device is connected to the bottoming coil through the bottoming needle on the bottoming comb. The motor drives the screw rod to rotate, so that the lifting seat drives the bottoming comb to descend, and when the bottoming comb descends, it drives the bottoming coil to move downward, so that the weaving mechanism weaves a bottoming fabric. Among them, the speed at which the bottoming comb pulls down the bottoming coil should match the speed at which the weaving mechanism weaves the bottoming fabric, that is, every time the weaving mechanism weaves a row, the bottoming comb drives the bottoming coil to move downward by the distance of one row. If the speed at which the bottoming comb pulls down is slow, the width between two adjacent rows of the bottoming fabric is small, that is, the weaving is dense; if the speed at which the bottoming comb pulls down is fast, the width between two adjacent rows of the bottoming fabric is large, that is, the weaving is loose. In the weaving industry, since the speed of the motor is relatively fast, the lowering speed of the bottom comb is generally fast. However, if the bottom comb is pulled down too fast, the weaving mechanism will not be able to effectively weave the bottom fabric, resulting in bottom failure.

[0004] At present, operators generally adjust the excessively fast motor speed by visual observation to make the pulling-down speed of the bottom comb match the weaving speed of the weaving mechanism. This method is inefficient and requires high experience from the operators. Therefore, it is urgent to design a mechanism that can automatically control the excessively fast descending speed of the bottom comb. Summary of the invention

[0005] In view of this, the present invention provides a bottom-lifting device and a tension control mechanism, the main purpose of which is to realize automatic control of the excessively fast descending speed of the bottom-lifting comb.

[0006] In order to achieve the above object, the present invention mainly provides the following technical solutions:

[0007] On the one hand, an embodiment of the present invention provides a tension control mechanism, including a nut seat, a limiting structure, a screw rod, a motor for driving the screw rod to rotate, a lifting seat for driving the bottom comb to rise and fall, and a first controller; the nut seat is sleeved on the screw rod, and the limiting structure is used to limit the circumferential position of the nut seat so that the nut seat is driven to rise and fall by the screw rod; an elastic member and a sensor are provided on the lifting seat; wherein, the nut seat is used to be driven to drive the lifting seat to rise, and to drive the lifting seat to descend through the elastic member; the sensor is used to be triggered to generate a signal when the deformation of the elastic member exceeds a set value, and the first controller is used to control the motor to decelerate or wait according to the signal.

[0008] By adopting the above technical scheme, when the descending speed of the bottom comb is too fast, causing the descending speed of the bottom comb to not match the weaving speed of the weaving mechanism, the deformation of the elastic part will exceed the set value, thereby triggering the sensor. The sensor generates a signal after being triggered, and the first controller controls the motor to slow down or wait according to the signal, thereby reducing the descending speed of the bottom comb, thereby achieving the purpose of automatically controlling the excessively fast descending speed of the bottom comb.

[0009] The present invention is further configured as follows: the tension control mechanism also includes a fixing member; there is a gap between the fixing member and the lifting seat, and the two remain relatively fixed; the nut seat is located between the fixing member and the lifting seat; the elastic member is located between the fixing member and the nut seat, so as to be compressed when the nut seat descends, and drive the lifting seat to descend by pushing the fixing member.

[0010] By adopting the above technical solution, the functions of the nut seat being driven to drive the lifting seat to rise, and the lifting seat being driven to descend by the elastic member can be realized.

[0011] The present invention is further configured as follows: a limiting column is provided on the nut seat, the limiting structure includes a limiting hole arranged on the lifting seat, the limiting hole is a non-circular hole, and the limiting hole has a shape consistent with the outer shape of the limiting column; the limiting column is used to be inserted into the limiting hole to limit the circumferential position of the nut seat.

[0012] By adopting the above technical solution, the function of the aforementioned limiting structure to limit the circumferential position of the nut seat can be realized.

[0013] The present invention is further configured as follows: the fixing piece is fixed to the lifting seat by bolts; a guide hole is provided on the nut seat, the bolt passes through the guide hole, and the center line direction of the bolt is consistent with the lifting direction of the nut seat.

[0014] By adopting the above technical solution, the bolt can not only fix the fixing member and the lifting seat together, but also serve as a lifting guide for the nut seat.

[0015] The present invention is further configured as follows: the sensor is a first Hall sensor, and a first magnetic component is provided on the nut seat; the first magnetic component is used to descend along with the nut seat and trigger the first Hall sensor when the deformation of the elastic component exceeds a set value.

[0016] By adopting the above technical solution, the function of the sensor being triggered to generate a signal when the deformation amount of the elastic member exceeds a set value can be realized.

[0017] On the other hand, an embodiment of the present invention further provides a bottom lifting device, which may include any one of the tension control mechanisms described above.

[0018] By adopting the above technical solution, since the bottoming device is provided with the above tension control mechanism, the purpose of automatically controlling the excessively fast descending speed of the bottoming comb can be achieved.

[0019] The present invention is further configured as follows: the number of the tension control mechanisms is two, wherein the lifting seat of one tension control mechanism is used to connect with one end of the bottom comb, and the lifting seat of the other tension control mechanism is used to connect with the other end of the bottom comb.

[0020] By adopting the above technical solution, compared with a single tension control mechanism, the two tension control mechanisms are more stable in pulling down the bottom comb.

[0021] The present invention is further configured as follows: the motor is a stepper motor, the stepper motor includes a housing and an output shaft passing through both ends of the housing, one end of the output shaft is connected to the screw rod, and the other end is fixedly sleeved with an incremental encoder; the bottom lifting device also includes a second controller and an alarm, the second controller is used to compare the number of counting pulses of the two incremental encoders when the output shafts of the two tension control mechanisms simultaneously rotate an angle of a pulse signal, and generate an alarm signal when they are inconsistent; the alarm is used to issue an alarm according to the alarm signal.

[0022] By adopting the above technical solution, when the speeds of the two tension control mechanisms pulling down the bottom combs are inconsistent, the second controller can control the alarm to give an alarm in time to remind the operator to deal with the abnormality in time.

[0023] The present invention is further configured as follows: the incremental encoder includes a turntable, a second magnetic member, a second Hall sensor and a counter; the incremental encoder is fixedly mounted on the other end of the output shaft through the turntable; there are multiple second magnetic members, and the multiple second magnetic members are all arranged on the turntable and are evenly distributed in a circular shape around the center line of the output shaft; the second Hall sensor is arranged on one side of each second magnetic member; the turntable is used to drive each second magnetic member to rotate so as to trigger the second Hall sensor in sequence; the counter is used to count the number of times the second Hall sensor is triggered, and transmit the number to the second controller.

[0024] By adopting the above technical solution, the turntable, the second magnetic part, the second Hall sensor and the counter cooperate with each other to realize the counting function of the incremental encoder. Its structure is simpler than that of the incremental encoders on the market and has lower cost.

[0025] The present invention is further configured such that: the number of the second Hall sensors is two and they are spaced apart and distributed around the center line of the output shaft.

[0026] By adopting the above technical solution, the forward and reverse rotation of the stepper motor can be distinguished during counting.

[0027] By means of the above technical solution, the bottom lifting device and the tension control mechanism of the present invention have at least the following beneficial effects:

[0028] 1. It can realize automatic control of the excessive descending speed of the bottom comb;

[0029] 2. When the speeds of the two tension control mechanisms pulling down the bottom combs are inconsistent, an alarm can be given in time to remind the operator to deal with the abnormality in time.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of a nut seat of a tension control mechanism in an embodiment of the present invention in an initial state;

[0032] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0033] Figure 3 This is a simplified structural diagram of an elastic member provided by an embodiment of the present invention, which is located between a lifting seat and a nut seat;

[0034] Figure 4is a structural schematic diagram of the tension control mechanism of an embodiment of the present invention when the nut seat is lowered;

[0035] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure at B in the middle;

[0036] Figure 6 yes Figure 4 Schematic diagram of the enlarged structure at C in the middle;

[0037] Figure 7 is a structural schematic diagram of a nut seat according to an embodiment of the present invention;

[0038] Figure 8 It is a partial structural schematic diagram of the bottom lifting device according to an embodiment of the present invention.

[0039] Figure numerals: 1. nut seat; 2. screw rod; 3. motor; 4. lifting seat; 5. first Hall sensor; 6. first magnetic part; 7. elastic part; 8. bolt; 9. fixing part; 10. mounting plate; 11. sliding seat; 12. slide rail; 13. incremental encoder; 14. control board; 31. housing; 32. output shaft; 101. limit column; 102. guide hole; 131. turntable; 132. second magnetic part; 133. second Hall sensor; 100. tension control mechanism; 200. bottom comb; 300. second controller; 400. alarm. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly. In addition, if there are descriptions of "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0041] like Figure 1 and Figure 2As shown, a tension control mechanism 100 proposed in one embodiment of the present invention includes a nut seat 1, a limiting structure, a screw rod 2, a motor 3, a lifting seat 4 and a first controller. The motor 3 is used to drive the screw rod 2 to rotate. The nut seat 1 is sleeved on the screw rod 2, and the limiting structure is used to limit the circumferential position of the nut seat 1, so that the nut seat 1 is driven to rise and fall by the screw rod 2. The nut seat 1 cooperates with the screw rod 2 to form a screw nut mechanism. An elastic member 7 is provided on the lifting seat 4. The elastic member 7 can be a spring or a flexible rubber. The elastic member 7 can be directly arranged on the lifting seat 4. For example, if the elastic member 7 is a spring, one end of the spring can be directly fixed on the lifting seat 4. The elastic member 7 can also be indirectly arranged on the lifting seat 4 through other components. Among them, the nut seat 1 is used to be driven to drive the lifting seat 4 to rise, and to drive the lifting seat 4 to fall through the elastic member 7. The lifting seat 4 is used to drive the bottom comb 200 to rise and fall. For example, the bottom comb 200 can be installed on the lifting seat 4, and the lifting seat 4 can drive the bottom comb 200 to rise and fall together when it rises and falls. The bottom comb 200 can be directly mounted on the lifting seat 4, or indirectly mounted on the lifting seat 4 through other components. The specific connection method between the bottom comb 200 and the lifting seat 4 is a prior art and will not be described in detail here.

[0042] The aforementioned lifting seat 4 is also provided with a sensor. The sensor is used to be triggered to generate a signal when the deformation of the elastic member 7 exceeds a set value, and the first controller is used to control the motor 3 to decelerate or wait according to the signal. Here, "waiting" means controlling the motor to stop running.

[0043] The above-mentioned motor 3 can rotate forward and reverse. When the motor 3 rotates forward, the motor 3 drives the screw rod 2 to rotate. Since the limiting structure limits the nut seat 1, the screw rod 2 drives the nut seat 1 to rise, and the nut seat 1 pushes the lifting seat 4 to rise together, and the lifting seat 4 drives the bottom comb 200 to rise to the starting position to wait for the bottom of the fabric. When the motor 3 reverses, the motor 3 drives the screw rod 2 to rotate. Since the limiting structure limits the nut seat 1, the screw rod 2 drives the nut seat 1 to descend, and the nut seat 1 drives the lifting seat 4 to descend through the elastic member 7, and the lifting seat 4 drives the bottom comb 200 to descend together, so as to pull up the bottom coil and bottom the fabric. Among them, the process of the nut seat 1 driving the lifting seat 4 to descend through the elastic member 7 is specifically as follows: the nut seat 1 applies force to the elastic member 7, such as compressing the elastic member 7 or stretching the elastic member 7, so that the elastic member 7 is deformed, and the deformed elastic member 7 applies force to the lifting seat 4, so that the lifting seat 4 descends, and then the lifting seat 4 drives the bottom comb 200 to descend, so as to pull up the bottom coil.

[0044] The elastic member 7 and the sensor cooperate with each other to meet the following conditions: when the descending speed of the base comb 200 matches the weaving speed of the weaving mechanism, the deformation of the elastic member 7 is within the set range and the sensor will not be triggered; when the descending speed of the base comb 200 is too fast, causing the descending speed of the base comb 200 to not match the weaving speed of the weaving mechanism, the deformation of the elastic member 7 exceeds the set value, thereby triggering the sensor. After the sensor is triggered, a signal is generated, and the first controller controls the motor 3 to slow down or wait according to the signal, thereby reducing the descending speed of the base comb 200.

[0045] In order to realize the function that the nut seat 1 is driven to drive the lifting seat 4 to rise, and the elastic member 7 drives the lifting seat 4 to descend, the present invention also provides the following method: In one example, Figure 3 As shown, the aforementioned elastic member 7 is arranged between the lifting seat 4 and the nut seat 1. One end of the elastic member 7 is fixedly connected to the lifting seat 4, and the other end is fixedly connected to the nut seat 1. Among them, the nut seat 1 can be located above or below the lifting seat 4. The nut seat 1 drives the lifting seat 4 to rise or fall through the elastic member 7. In this example, preferably, the elastic member 7 is a spring, the spring is sleeved on the screw rod 2, one end of the spring is welded to the lifting seat 4, and the other end is welded to the nut seat 1. After being driven, the nut seat 1 in this example does not directly push or pull the lifting seat 4 to rise, but indirectly drives the nut seat 1 to rise through the elastic member 7. Specifically, when the nut seat 1 rises, the nut seat 1 applies force to the elastic member 7, so that the elastic member 7 is stretched and deformed (when the nut seat 1 is located above the lifting seat 4) or compressed and deformed (when the nut seat 1 is located below the lifting seat 4), and the deformed elastic member 7 applies force to the lifting seat 4 to make the lifting seat 4 rise.

[0046] Of course, in another example, the nut seat 1 can also directly drive the lifting seat 4 to rise when rising, without passing through the elastic member 7. In this other example, Figure 4 and Figure 5 As shown, the tension control mechanism 100 of the present invention also includes a fixing member 9. The fixing member 9 can be in the shape of a disc. There is a gap between the fixing member 9 and the lifting seat 4, and the two remain relatively fixed so that the two can move synchronously. The nut seat 1 is located between the fixing member 9 and the lifting seat 4. The aforementioned elastic member 7 is located between the fixing member 9 and the nut seat 1, so that it is compressed when the nut seat 1 descends, and drives the lifting seat 4 to descend by pushing the fixing member 9. Among them, when the nut seat 1 rises, the nut seat 1 directly abuts against the lifting seat 4 to push the lifting seat 4 to rise. In this example, preferably, the elastic member 7 is sleeved on the screw rod 2, and the elastic member 7 does not need to be connected to the fixing member 9 and the nut seat 1, and can be directly placed between the two. In the initial state, the nut seat 1 abuts against the lifting seat 4. Since the elastic member 7 does not need to be connected to the fixing member 9 and the nut seat 1, the installation of the elastic member 7 is convenient.

[0047] In order to realize the function of the aforementioned limiting structure to limit the circumferential position of the nut seat 1, as Figure 5 and Figure 7 As shown, the aforementioned nut seat 1 may be provided with a limiting column 101 (such as Figure 7 ). The limiting structure includes a limiting hole provided on the lifting seat 4. The limiting hole is a non-circular hole, for example, a square hole or a semicircular hole. The limiting hole has a shape consistent with the outer shape of the limiting column 101. The limiting column 101 is used to be inserted into the limiting hole to limit the circumferential position of the nut seat 1, so that the nut seat 1 moves along the screw rod 2 when driven by the screw rod 2.

[0048] In a specific application example, Figure 7 As shown, the aforementioned limiting column 101 and the nut seat 1 can be an integrally formed structure. The limiting column 101 is also threadedly sleeved on the screw rod 2, so that the connection stability between the nut seat 1 and the screw rod 2 is better.

[0049] like Figure 5 and Figure 7 As shown, the aforementioned fixing member 9 can be fixed to the lifting seat 4 by means of bolts 8. The aforementioned nut seat 1 is provided with a guide hole 102 (such as Figure 7 As shown in FIG. 1 ), the bolt 8 passes through the guide hole 102, and the centerline direction of the bolt 8 is consistent with the lifting direction of the nut seat 1. In this example, the bolt 8 passes through the fixing member 9 and the nut seat 1 in sequence and is threadedly connected to the lifting seat 4, and the bolt 8 can be a lifting guide for the nut seat 1. Preferably, the number of the bolts 8 is four, and the centerline of the screw rod 2 is evenly distributed in a circular shape.

[0050] like Figure 2 and Figure 5 As shown, the aforementioned sensor may be a Hall sensor. In order to distinguish it from the Hall sensor hereinafter, the Hall sensor here is referred to as the first Hall sensor 5. The aforementioned nut seat 1 is provided with a first magnetic member 6, which may be embedded in the nut seat 1, and the first magnetic member 6 may be a magnet, etc. The first magnetic member 6 is used to descend with the nut seat 1, and when the deformation amount of the elastic member 7 exceeds a set value, trigger the first Hall sensor 5, so that the first Hall sensor 5 generates a signal.

[0051] The aforementioned sensor may also be a pressure sensor, which is disposed between the elastic member 7 and the fixing member 9. When the deformation of the elastic member 7 exceeds a set value, the pressure sensor is triggered to generate a signal.

[0052] like Figure 8As shown, an embodiment of the present invention further provides a bottom starting device, which includes any of the tension control mechanisms 100 described above, so as to control the excessively fast descending speed of the bottom starting comb 200 through the tension control mechanism 100, so that the downward pulling speed of the bottom starting comb 200 matches the weaving speed of the weaving mechanism.

[0053] In a specific application example, Figure 1 and Figure 4 As shown, the bottom lifting device also includes a mounting plate 10, a sliding seat 11 and a slide rail 12. The sliding seat 11 is arranged on the mounting plate 10, for example, it can be fixed on the mounting plate 10 by screws. The sliding seat 11 has a through-going limiting slide groove, and the slide rail 12 is slidably matched with the limiting slide groove, so that the slide rail 12 can slide along the limiting slide groove. The slide rail 12 is fixedly connected to the aforementioned lifting seat 4 to drive the lifting seat 4 to rise and fall along the limiting slide groove. The bottom lifting comb 200 can be arranged on the slide rail 12, for example, it can be fixed on the slide rail 12 by pins, etc., so as to rise and fall under the drive of the slide rail 12.

[0054] like Figure 8 As shown, the number of the tension control mechanisms 100 can be two, wherein the lifting seat 4 of one tension control mechanism 100 is used to connect with one end of the bottom comb 200, and the lifting seat 4 of the other tension control mechanism 100 is used to connect with the other end of the bottom comb 200. Compared with a single tension control mechanism 100, the two tension control mechanisms 100 are more stable in pulling down the bottom comb 200.

[0055] Furthermore, the aforementioned motor 3 may be a stepping motor. Figure 4 As shown, the stepper motor includes a housing 31 and an output shaft 32 passing through both ends of the housing 31. One end of the output shaft 32 is connected to the screw rod 2, for example, it can be connected to the screw rod 2 through a coupling. The other end of the output shaft 32 is fixedly sleeved with an incremental encoder 13. When the output shaft 32 of the stepper motor rotates, the incremental encoder 13 can record the rotation angle of the output shaft 32 by counting pulses. Figure 8 As shown, the bottom lifting device of the present invention further includes a second controller 300 and an alarm 400. The second controller 300 is used to compare the number of count pulses of the two incremental encoders 13 when the output shafts 32 of the two tension control mechanisms 100 rotate at the same time by an angle of a pulse signal, and generate an alarm signal when they are inconsistent. The second controller 300 can be a processor or a PLC, etc. The alarm 400 is used to issue an alarm according to the alarm signal. The above-mentioned alarm 400 can be a buzzer, etc.

[0056] Specifically, when the bottom comb 200 needs to be pulled down, the pulse generator sends a pulse signal to the stepper motors of the two tension control mechanisms 100 at the same time. After receiving the pulse signal, the two stepper motors drive the screw 2 to rotate. The two incremental encoders 13 respectively record the rotation angle of the output shaft 32 of each stepper motor by counting pulses, and send the recorded count pulse number to the second controller 300 for comparison. If the count pulse numbers of the two incremental encoders 13 are inconsistent, it means that the rotation speeds of the two stepper motors are inconsistent, which will cause the lowering speeds of the two ends of the bottom comb 200 to be different, affecting the weaving effect of the bottom fabric. At this time, the second controller 300 will control the alarm 400 to issue an alarm in time to remind the operator to deal with the abnormality in time.

[0057] In a specific application example, Figure 4 and Figure 6 As shown, the aforementioned incremental encoder 13 may include a turntable 131, a second magnetic member 132, a second Hall sensor 133 and a counter. The incremental encoder 13 is fixedly sleeved on the other end of the output shaft 32 through the turntable 131. The number of the second magnetic member 132 is multiple, and the second magnetic member 132 may be a magnet or the like. The multiple second magnetic members 132 are all arranged on the turntable 131, for example, they may be embedded on the turntable 131. The multiple second magnetic members 132 may be evenly spaced and distributed in a circular shape around the center line of the output shaft 32. The above-mentioned second Hall sensor 133 is arranged on one side of each second magnetic member 132, for example, the second Hall sensor 133 may be arranged on the control board 14, and then the control board 14 may be fixed on the housing 31 of the stepping motor to maintain the relative positional relationship between the second Hall sensor 133 and each second magnetic member 132. The turntable 131 is used to drive each second magnetic member 132 to rotate, so as to trigger the second Hall sensor 133 in sequence. The counter is used to count the number of times the second Hall sensor 133 is triggered and transmit the number to the second controller 300 .

[0058] In the above example, the turntable 131, the second magnetic member 132, the second Hall sensor 133 and the counter cooperate with each other to realize the counting function of the incremental encoder 13, and its structure is simpler and lower in cost than that of the incremental encoder 13 on the market.

[0059] Furthermore, there are two second Hall sensors 133 , which are spaced apart around the center line of the output shaft 32 , so that the forward and reverse rotations of the stepper motor can be distinguished during counting. The specific distinguishing method is prior art and will not be described in detail here.

[0060] The working principle and preferred embodiments of the present invention are introduced below.

[0061] The present invention is to design a tension control mechanism 100, which includes a nut seat 1, a screw rod 2, a motor 3, a lifting seat 4, an elastic member 7 and a second controller 300. The lifting seat 4 is used to connect with the bottom comb 200. A sensor is provided on the lifting seat 4. The nut seat 1 is sleeved on the screw rod 2, and the two cooperate to form a screw rod 2 nut mechanism. The motor 3 is used to drive the screw rod 2 to rotate, and the screw rod 2 drives the nut seat 1 to rise and fall. A fixing member 9 is provided on the lifting seat 4, and the fixing member 9 can be in the shape of a disc. The nut seat 1 is located between the lifting seat 4 and the fixing member 9. The bolt 8 passes through the fixing member 9, the nut seat 1 and the lifting seat 4 in sequence, and the nut seat 1 is provided with a guide hole 102 for the bolt 8 to pass through. The elastic member 7 can be a spring, which is sleeved on the screw rod 2 and located between the nut seat 1 and the fixing member 9. In the initial state, one end of the spring abuts against one end of the nut seat 1, and the other end abuts against the fixing member 9, and the end of the nut seat 1 that is away from the spring abuts against the lifting seat 4. When the motor 3 rotates forward, the motor 3 drives the screw rod 2 to rotate, the screw rod 2 drives the nut seat 1 to rise, the nut seat 1 pushes the lifting seat 4 to rise, and then the lifting seat 4 drives the bottom comb 200 to rise. When the motor 3 rotates reversely, the motor 3 drives the screw rod 2 to rotate, the screw rod 2 drives the nut seat 1 to descend, the nut seat 1 compresses the spring, and the deformed spring applies force to the fixing member 9 to drive the lifting seat 4 to descend through the fixing member 9, and then the lifting seat 4 drives the bottom comb 200 to descend. When the bottom comb 200 descends too fast, the nut seat 1 will apply a large force to the spring, causing the deformation of the spring to exceed the preset value. At this time, the sensor will be triggered to generate a signal, and the sensor sends the signal to the second controller 300. The second controller 300 controls the motor 3 to slow down or wait according to the signal.

[0062] Through the above structure, the tension control mechanism 100 of the present invention can realize automatic control of the excessively fast descending speed of the bottom comb 200.

[0063] It should be noted here that: in the absence of conflict, technicians in this field can combine the relevant technical features in the above examples according to actual conditions to achieve corresponding technical effects, and the specific combinations are not described here one by one.

[0064] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A tension control mechanism, characterized in that: It comprises a nut seat (1), a limiting structure, a screw rod (2), a motor (3) for driving the screw rod (2) to rotate, a lifting seat (4) for driving the bottom comb (200) to rise and fall, and a first controller; The nut seat (1) is sleeved on the screw rod (2), and the limiting structure is used to limit the circumferential position of the nut seat (1), so that the nut seat (1) is driven by the screw rod (2) to rise and fall; The lifting seat (4) is provided with an elastic member (7) and a sensor; The nut seat (1) is used to be driven to drive the lifting seat (4) to rise, and to drive the lifting seat (4) to descend through the elastic member (7); the sensor is used to be triggered to generate a signal when the deformation of the elastic member (7) exceeds a set value, and the first controller is used to control the motor (3) to decelerate or wait according to the signal; Also includes a fixing member (9); There is a gap between the fixing member (9) and the lifting seat (4), and the two are kept relatively fixed; The nut seat (1) is located between the fixing member (9) and the lifting seat (4); The fixing member (9) is fixed to the lifting seat (4) via bolts (8); The nut seat (1) is provided with a guide hole (102), the bolt (8) passes through the guide hole (102), and the center line direction of the bolt (8) is consistent with the lifting direction of the nut seat (1). The elastic member (7) is located between the fixing member (9) and the nut seat (1) and the elastic member (7) is sleeved on the screw rod (2). The elastic member (7) does not need to be connected to the fixing member (9) and the nut seat (1). The elastic member (7) is directly placed between the fixing member (9) and the nut seat (1) so as to be compressed when the nut seat (1) descends and to drive the lifting seat (4) to descend by pushing the fixing member (9). When the nut seat (1) rises, the nut seat (1) directly abuts against the lifting seat (4) to push the lifting seat (4) to rise. In the initial state, the nut seat 1 abuts against the lifting seat 4. The nut seat (1) is provided with a limiting column (101), and the limiting structure comprises a limiting hole provided on the lifting seat (4), the limiting hole is a non-circular hole, and the limiting hole has a shape consistent with the outer shape of the limiting column (101); The nut seat (1) is provided with a first magnetic member (6); the sensor is a first Hall sensor (5), and the nut seat (1) is provided with a first magnetic member (6); the first magnetic member (6) is used to descend along with the nut seat (1) and to trigger the first Hall sensor (5) when the deformation of the elastic member (7) exceeds a set value.

2. The tension control mechanism according to claim 1, characterized in that: The limiting column (101) is used to be inserted into the limiting hole to limit the circumferential position of the nut seat (1).

3. A bottom lifting device, characterized in that: It comprises the tension control mechanism described in any one of claims 1-2.

4. The bottom lifting device according to claim 3, characterized in that: There are two tension control mechanisms, wherein the lifting seat (4) of one tension control mechanism is used to connect with one end of the bottom comb (200), and the lifting seat (4) of the other tension control mechanism is used to connect with the other end of the bottom comb (200).

5. The bottom lifting device according to claim 4, characterized in that: The motor (3) is a stepper motor, comprising a housing (31) and an output shaft (32) passing through two ends of the housing (31); one end of the output shaft (32) is connected to the lead screw (2), and the other end is fixedly sleeved with an incremental encoder (13); The bottom lifting device also includes a second controller (300) and an alarm (400), wherein the second controller (300) is used to compare the number of count pulses of the two incremental encoders (13) when the output shafts (32) of the two tension control mechanisms rotate at the same time by an angle of a pulse signal, and to generate an alarm signal when the numbers are inconsistent; The alarm device (400) is used to issue an alarm according to the alarm signal.

6. The bottom lifting device according to claim 5, characterized in that: The incremental encoder (13) comprises a rotating disk (131), a second magnetic member (132), a second Hall sensor (133) and a counter; The incremental encoder (13) is fixedly sleeved on the other end of the output shaft (32) via a rotating disk (131); The number of the second magnetic members (132) is plural, and the plurality of second magnetic members (132) are all arranged on the rotating disk (131) and are evenly spaced and distributed in a circular shape around the center line of the output shaft (32); The second Hall sensor (133) is arranged on one side of each second magnetic member (132); The rotating disk (131) is used to drive each second magnetic member (132) to rotate, so as to trigger the second Hall sensors (133) in sequence; The counter is used to count the number of times the second Hall sensor (133) is triggered, and transmit the number to the second controller (300).

7. The bottom lifting device according to claim 6, characterized in that: The number of the second Hall sensors (133) is two, and they are spaced apart and distributed around the center line of the output shaft (32).

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