Reciprocating motion driving mechanism, stand column assembly and 3D printer

Abstract

The utility model provides a reciprocating motion driving mechanism, a stand column assembly and a 3D printer, and relates to the technical field of printing equipment. The driving mechanism comprises at least two transmission wheels, a transmission belt fixing piece, a transmission belt and at least two driving pieces, the transmission belt sleeves the at least two transmission wheels, and the transmission belt is fixedly connected with the transmission belt fixing piece; each driving part drives one transmission wheel to rotate, and all the transmission wheels can rotate synchronously so as to drive the transmission belt to rotate and drive the transmission belt fixing part to move. The deformation quantity of the transmission belt can be reduced, the situation that an effector shakes due to deformation of the transmission belt is relieved, and the printing quality is improved; moreover, the driving force of the transmission belt can be increased, the probability of clamping stagnation caused by insufficient driving force of the transmission belt is reduced, and the printing efficiency can be improved; in addition, the response speed of effector movement can be increased, and the printing precision is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing equipment, in particular to a reciprocating movement driving mechanism, a column assembly and a 3D printer. BACKGROUND

[0002] Generally, the column assembly of a 3D printer adopts a single motor to drive a transmission belt to move a fixed block and a parallel arm, so as to drive an effector to move in a three-dimensional space through the parallel arm. In a high-speed printing state, since the overall span of the transmission belt is large, the effector may shake and be stuck due to the deformation of the transmission belt during the running of the transmission belt, which affects the printing quality. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application aims to overcome the deficiencies in the prior art, and provides a reciprocating movement driving mechanism, a column assembly and a 3D printer, which can reduce the deformation of the transmission belt, alleviate the shaking of the effector due to the deformation of the transmission belt, and thus improve the printing quality; can increase the driving force of the transmission belt, reduce the probability of sticking due to insufficient driving force of the single motor, and improve the printing efficiency; and can improve the response speed of the movement of the effector and improve the printing precision.

[0004] The present application provides the following technical solutions:

[0005] In a first aspect, the present application provides a reciprocating movement driving mechanism, which comprises:

[0006] at least two transmission wheels, a transmission belt fixing member and a transmission belt, the transmission belt being sleeved on the at least two transmission wheels, and the transmission belt fixing member being fixedly connected to the transmission belt;

[0007] at least two driving members, each of the driving members driving one of the transmission wheels to rotate, and all the transmission wheels being capable of synchronously rotating to drive the transmission belt to rotate and drive the transmission belt fixing member to move.

[0008] In some embodiments of the first aspect, the driving mechanism further comprises at least one of the following technical features:

[0009] Firstly, the driving member comprises a motor, and the main shaft of the motor is coaxially connected to the corresponding transmission wheel;

[0010] Secondly, the transmission belt is a belt, and the transmission wheel is a synchronous pulley;

[0011] Thirdly, the transmission belt has two free ends, and the free ends are detachably connected to the transmission belt fixing member;

[0012] The fourth item: the number of the transmission wheels is 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12; the number of the driving members is 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12;

[0013] The fifth item: the driving mechanism further comprises a transmission belt pre-tightening mechanism for keeping the transmission belt in a tensioned state.

[0014] In some embodiments of the first aspect, the transmission belt fixing member comprises a base, and a clamping portion is arranged on the base, the clamping portion being used for clamping and fixing the transmission belt;

[0015] And / or, the transmission belt fixing member comprises a base, and a fixing column is arranged on the base, the fixing column being used for penetrating through a hole on the transmission belt or a loop formed by folding back a free end of the transmission belt, so as to fix the transmission belt.

[0016] In some embodiments of the first aspect, the clamping portion comprises a first clamping block and a second clamping block, the first clamping block and / or the second clamping block being movably fixed to the base, a clamping gap being formed between the first clamping block and the second clamping block, the clamping gap being used for accommodating the transmission belt; the width of the clamping gap gradually decreases when the first clamping block and the second clamping block move close to each other, so as to gradually compress the transmission belt; the width of the clamping gap gradually increases when the first clamping block and the second clamping block move away from each other, so as to gradually loosen the transmission belt.

[0017] In some embodiments of the first aspect, the clamping portion further comprises at least one of the following technical features:

[0018] The first item: the clamping portion comprises an adjusting member, the adjusting member being used for adjusting the distance between the first clamping block and the second clamping block to change the width of the clamping gap;

[0019] The second item: the clamping portion comprises a guide member, the guide member being used for limiting the movement path of the first clamping block and / or the second clamping block;

[0020] The third item: the first clamping block and / or the second clamping block has a tooth portion, the tooth portion being used for gradually abutting and compressing the transmission belt when the first clamping block and the second clamping block move close to each other.

[0021] In some embodiments of the first aspect, the transmission belt fixing member further comprises at least one of the following technical features:

[0022] The first item: the transmission belt fixing member further comprises a parallel arm fixing frame, the parallel arm fixing frame is arranged on the base, and the parallel arm fixing frame is used for fixing a parallel arm; the parallel arm fixing frame has an avoiding channel, and the transmission belt is arranged in the avoiding channel;

[0023] The second item: the transmission belt fixing member further comprises a moving part, and the base is fixed on the moving part.

[0024] The second aspect, the application further provides a column assembly, the column assembly comprises:

[0025] The driving mechanism as described in any one of the above embodiments;

[0026] A column, and the transmission wheel is rotatably fixed on the column;

[0027] A first guide part is arranged on the column and extends along the height direction of the column; the moving part on the transmission belt fixing member cooperates with the first guide part, so that the transmission belt fixing member can reciprocate along the first guide part under the driving of the driving member.

[0028] In some embodiments of the second aspect, the column assembly further comprises:

[0029] Limit switches are arranged at both ends of the moving path of the transmission belt fixing member.

[0030] In some embodiments of the second aspect, the column assembly further comprises a transmission belt pre-tightening mechanism, the transmission belt pre-tightening mechanism comprises a pre-tightening wheel, a pre-tightening adjusting member, a pre-tightening mounting seat, a second guide part and an elastic part, the pre-tightening wheel is rotatably mounted on the pre-tightening adjusting member, the second guide part is arranged on the pre-tightening mounting seat, and the pre-tightening mounting seat is used for fixing and mounting the transmission belt pre-tightening mechanism; the second guide part and the first guide part have the same extension direction, the pre-tightening adjusting member cooperates with the second guide part, and the second guide part is used for limiting the moving path of the pre-tightening adjusting member.

[0031] One end of the elastic part is connected to the pre-tightening adjusting member, and the other end is connected to the pre-tightening mounting seat; the transmission belt is sleeved on the pre-tightening wheel, so that the pre-tightening adjusting member moves along the second guide part to compress the elastic part, and the elastic part is in an elastic deformation state.

[0032] The third aspect, the application further provides a 3D printer, the 3D printer comprises a parallel arm-effector and a column assembly as described in any one of the above embodiments, one end of the parallel arm is movably connected to the effector, and the other end is movably connected to the transmission belt fixing member of the column assembly.

[0033] The embodiments of the present application have the following advantages:

[0034] The present application provides a reciprocating movement driving mechanism, which can achieve the following effects by using multiple transmission wheels and at least two driving members to jointly drive the transmission belt:

[0035] Reduce the deformation of the transmission belt: using more transmission wheels can divide the transmission belt into smaller parts, thereby reducing the tension on each section of the transmission belt and further reducing the deformation of the transmission belt. In addition, multi-point driving can also help to keep the tension of the transmission belt more uniform. Obviously, by reducing the deformation of the transmission belt, the situation of effector shaking due to transmission belt deformation is alleviated, and the printing quality is improved.

[0036] Increase the driving force: multiple driving members provide power simultaneously, which can provide greater total driving force compared to a single driving source, which helps to overcome the situation of insufficient driving force that may occur during printing, such as when encountering areas with greater resistance, to avoid the phenomenon of jamming due to insufficient driving force, and to improve printing efficiency. Moreover, there is no need to replace the motor with greater torque, and compared to the present application, the cost of replacing the motor with greater torque will increase exponentially.

[0037] Enhance response speed and accuracy: when multiple driving members work together, the speed or direction of the transmission belt can be adjusted more quickly, thereby improving the response speed of the entire system, i.e. improving the response speed of the effector movement and improving the printing accuracy. This is particularly important for application scenarios that require rapid changes in printing paths. At the same time, stable driving also helps to maintain higher positioning accuracy, further improving printing quality.

[0038] The present application also relates to a column assembly and a 3D printer. Since the above-mentioned driving mechanism has the above-mentioned technical effects, the column assembly and the 3D printer comprising the driving mechanism should have the same technical effects, which will not be described here.

[0039] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0041] Figure 1A perspective view of a drive mechanism is shown according to an embodiment of the present application.

[0042] Figure 2 A perspective view of a column assembly is shown according to an embodiment of the present application.

[0043] Figure 3 Another perspective view of a column assembly is shown according to an embodiment of the present application.

[0044] Figure 4 A perspective view of a column assembly is shown according to another embodiment of the present application.

[0045] Figure 5 A perspective view of a column assembly is shown according to another embodiment of the present application. Figure 4 A perspective view of a column assembly is shown according to another embodiment of the present application.

[0046] Figure 6 A perspective view of a drive belt pre-tightening mechanism of a column assembly is shown according to an embodiment of the present application.

[0047] Figure 7 A perspective view of a drive belt fixing member of a column assembly is shown according to an embodiment of the present application.

[0048] Figure 8 A perspective view of a drive belt fixing member of a column assembly is shown according to another embodiment of the present application.

[0049] Figure 9 A perspective view of a drive belt fixing member of a column assembly is shown according to another embodiment of the present application.

[0050] Figure 10 A perspective view of a drive belt fixing member of a column assembly is shown according to another embodiment of the present application.

[0051] Figure 11 A perspective view of a drive belt fixing member of a column assembly is shown according to another embodiment of the present application.

[0052] Main component symbol explanation:

[0053] 100 - driving member; 200 - limit switch; 300 - column; 400 - first guide portion; 500 - transmission belt fixing member; 510 - limit portion; 520 - fixing column; 530 - clamping portion; 531 - first clamping block; 532 - second clamping block; 533 - guide member; 534 - adjusting member; 535 - clamping gap; 540 - parallel arm fixing frame; 550 - base; 560 - moving member; 600 - transmission belt; 610 - free end; 700 - transmission belt pre-tightening mechanism; 710 - elastic portion; 720 - pre-tightening wheel; 730 - pre-tightening adjusting member; 740 - second guide portion; 750 - pre-tightening mounting seat; 800 - transmission wheel; X - height direction. DETAILED DESCRIPTION

[0054] Embodiments of the present application are described in detail below with reference to examples illustrated in the attached drawings, wherein the same or similar components have the same or similar designations throughout the various figures and text. The embodiments described below are examples of the present application, which are only for explanation and cannot be understood as limiting the present application.

[0055] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical", "horizontal", "left", "right", and the like as used herein are used for explanation purposes only and are not intended to be limiting.

[0056] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or can be integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the templates herein is used only for the purpose of describing particular embodiments and is not intended to be limiting of this application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0059] In the related art, the column assembly of the 3D printer adopts a single motor to drive a transmission belt to move a fixed block and a parallel arm, so as to move an effector in a three-dimensional space through the parallel arm. In a high-speed printing state, since the overall span of the transmission belt is large, there is a problem of effector jitter and jam caused by the deformation of the transmission belt during the running of the transmission belt, which affects the printing quality.

[0060] As shown in Figure 1 , Figure 2 and Figure 3 , in order to solve the above technical problems, the embodiments of the present application provide a reciprocating movement driving mechanism, the driving mechanism comprising at least two transmission wheels 800, a transmission belt fixing member 500, a transmission belt 600 and at least two driving members 100, the transmission belt 600 being sleeved on the at least two transmission wheels 800, and the transmission belt 600 being fixedly connected with the transmission belt fixing member 500; each driving member 100 drives one transmission wheel 800 to rotate, and all the transmission wheels 800 can rotate synchronously to drive the transmission belt 600 to rotate and drive the transmission belt fixing member 500 to move.

[0061] In these embodiments, an improved reciprocating movement driving mechanism design in the column 300 assembly of the 3D printer is provided, aiming to solve the problem of effector (i.e. print head) jitter caused by the deformation of the transmission belt 600 in the single motor driving transmission belt 600 system in high-speed printing, which reduces the printing quality.

[0062] In order to achieve these objectives, the present application adopts multiple transmission wheels 800, that is, the number of transmission wheels 800 is at least two. In this embodiment, the number of transmission wheels 800 is taken as an example of two, and these transmission wheels 800 are arranged at intervals along a predetermined direction, which is the movement direction of the transmission member fixing member driven by the transmission belt 600.

[0063] Moreover, the transmission belt 600 is arranged around these transmission wheels 800 to drive the transmission belt 600 to rotate through the transmission wheels 800. Among them, the transmission mode of the transmission wheel 800 and the transmission belt 600 has multiple modes. For example, the transmission between the transmission wheel 800 and the transmission belt 600 relies on friction transmission. Alternatively, in other embodiments, the transmission wheel 800 is a synchronous wheel, the transmission belt 600 is a synchronous belt, and the two are meshed to transmit.

[0064] Furthermore, at least two transmission wheels 800 are connected to different driving members 100, so that all transmission wheels 800 can be rotated synchronously by controlling the driving members 100 at different positions to ensure the same speed of rotation.

[0065] There are various ways to keep the rotation speed of multiple transmission wheels 800 the same. In this application, the driving member 100 is taken as an example of a motor. Exemplarily, a synchronous controller is used. For example: electronic synchronous control: using a microprocessor or a special motion controller to monitor the speed of each motor, and adjusting the current or other parameters through a feedback system to keep the speed consistent. This usually involves encoders or other types of sensors to detect the actual rotation speed.

[0066] Servo drive: if the motor used is a servo motor, precise speed control can be achieved through a servo drive. The servo drive can receive speed instructions from the controller and has a built-in closed-loop control system that can adjust the output in real time to maintain the set speed.

[0067] Of course, in other embodiments, mechanical synchronization devices can also be used to control the rotation speed of multiple transmission wheels 800 to be the same:

[0068] Gear transmission: connect two motors through gears, so that they will be forced to rotate at the same speed. This method is simple but may increase the complexity and weight of the system.

[0069] Alternatively, software algorithms can be used to control the rotation speed of multiple transmission wheels 800 to be the same:

[0070] Speed matching algorithm: implement an algorithm at the software level that calculates based on the speed feedback information obtained from each motor and then sends appropriate commands to each motor to make the speed consistent.

[0071] Master-slave control: set one motor as the master and the other as the slave. The master motor runs at a predetermined speed, while the slave motor adjusts its speed by comparing the speed difference between itself and the master motor, thereby achieving synchronization.

[0072] Alternatively, hardware design can be used to control the rotation speed of multiple transmission wheels 800 to be the same, as follows:

[0073] Selecting a high-precision motor: Choose a motor with high-precision characteristics, such as a stepper motor or a servo motor. These motors inherently possess good speed control characteristics, etc. In some embodiments of this application, when the driving component 100 is, for example, a stepper motor, two stepper motors can drive their respective transmission wheels to rotate synchronously; synchronous rotation means that the speed and step distance of the stepper motors are consistent. In other embodiments of this application, the driving component 100 is, for example, a servo motor, and two servo motors can drive their respective transmission wheels to rotate synchronously; synchronous rotation means that the output shafts of the two servo motors are synchronized.

[0074] Therefore, by employing multiple drive pulleys 800 and at least two drive members 100 to jointly drive the transmission belt 600, this application achieves the following effects:

[0075] 1) Reducing the deformation of the drive belt 600: Using more drive pulleys 800 divides the drive belt 600 into smaller segments, thereby reducing the tension on each segment and thus reducing the deformation of the drive belt 600. Furthermore, multi-point drive helps maintain a more uniform tension on the drive belt 600. Clearly, by reducing the deformation of the drive belt 600, the effector jitter caused by drive belt deformation is alleviated, improving print quality.

[0076] 2) Increased driving force: Power is provided simultaneously by multiple drive components 100, resulting in a greater total driving force compared to a single drive source. This helps overcome potential power shortages during printing, such as when encountering areas of high resistance, preventing jamming due to insufficient driving force and improving printing efficiency. Furthermore, there is no need to replace the motor with a higher torque motor due to insufficient torque, and the cost of replacing the motor with a higher torque motor would increase exponentially compared to the solution in this application.

[0077] 3) Enhanced Response Speed ​​and Accuracy: When multiple drive components 100 work together, the speed or direction of the transmission belt 600 can be adjusted more quickly, thereby improving the overall system response speed, i.e., improving the response speed of the effector movement and increasing printing accuracy. This is especially important for applications that require rapid changes in the printing path. At the same time, stable driving also helps maintain higher positioning accuracy, further improving print quality.

[0078] like Figure 1 As shown, in some embodiments, the drive unit 100 includes a motor, and the main shaft of the motor and the corresponding drive wheel 800 are coaxially connected.

[0079] In these embodiments, the motor spindle is directly coaxially connected to the corresponding drive wheel 800. The key to ensuring that these motors rotate at the same speed is to precisely control the speed of each motor to improve the rotational response speed of the drive wheel 800, thereby improving the response speed of the entire printing system.

[0080] Exemplarily, in the present embodiment, the main shaft of the motor and the wheel shaft of the transmission wheel 800 are coaxially welded and fixed. Of course, in other embodiments, the main shaft of the motor is coaxially connected with the wheel shaft of the transmission wheel 800 through a shaft coupling.

[0081] Further, the motor can be selected from various types. Exemplarily, in the present embodiment, the motor is a stepper motor. Of course, in other embodiments, the motor can also be a servo motor, an AC motor, a DC motor, etc.

[0082] As shown in FIG. 6, in some embodiments, the transmission belt 600 is a belt, and the transmission wheel 800 is a synchronous pulley. Figure 1

[0083] In these embodiments, the transmission belt 600 is a belt, such as a synchronous belt, and the transmission wheel 800 is a synchronous pulley. In order to ensure the stability and reliability of the belt, the design of the transmission belt fixing member 500 is very important, which is used to connect the transmission belt 600 and to butt joint the connecting arms.

[0084] Obviously, the combination of the belt and the synchronous pulley can improve the response efficiency of the belt action. Moreover, the tension of the belt can be improved.

[0085] As shown in FIG. 6, in some embodiments, the transmission belt 600 has two free ends 610, and the free ends 610 and the transmission belt fixing member 500 are detachably connected. Figure 7 、 Figure 8 、 Figure 9 and Figure 10 In these embodiments, the transmission belt 600 is designed to have two free ends 610, and the free ends 610 can be detachably connected with the transmission belt fixing member 500. When the two free ends 610 and the transmission belt fixing member 500 are connected, the transmission belt 600 forms a closed structure. Predictably, the above structure is easy to maintain and replace the transmission belt 600. In the case of damage or wear of the transmission belt 600, the old transmission belt 600 can be easily detached and a new transmission belt 600 can be installed without completely disassembling the entire drive mechanism.

[0086] In addition, the tension of the transmission belt 600 can also be adjusted, that is, by adjusting the connection position of the transmission belt fixing member 500 and the transmission belt 600, the tension of the transmission belt 600 can be easily adjusted to ensure the smooth operation of the transmission system.

[0087]

[0088] ​​Meanwhile, the transmission belt fixing member 500 should include a fixing device for firmly fixing the free end 610 of the transmission belt 600 thereon. Exemplarily, the fixing device can be a mechanical clamp, which is used to clamp the free end 610 of the transmission belt 600 on the transmission belt fixing member 500. This way is simple and direct, but it is necessary to ensure that the clamp is firm enough to prevent the transmission belt 600 from slipping off. Of course, in other embodiments, the fixing device can also adopt a design similar to a quick release buckle, which allows the user to quickly release and reconnect the transmission belt 600. This way is both safe and convenient.

[0089] Alternatively, the fixing device adopts a bolt / screw, which is used to fix one end of the transmission belt 600 to the transmission belt fixing member 500 by a bolt or a screw. This way is relatively traditional, but it is very reliable and suitable for long-term use.

[0090] As shown in FIG. 8, Figure 1 in some embodiments, the number of transmission wheels 800 is 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12; and the number of driving members 100 is 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12.

[0091] In these embodiments, it is obvious that the number of transmission wheels 800 and the number of driving members 100 are not specifically limited, as long as the above requirements can be met. In specific operation, the number of driving members 100 can be set to be the same as the number of transmission wheels 800. Of course, the number of driving members 100 can also be set to be less than the number of transmission wheels 800.

[0092] Exemplarily, in the present embodiment, the number of transmission wheels 800 is 2, and the number of driving members 100 is 2. Of course, in other embodiments, the number of transmission wheels 800 is set to be greater than 2, and the number of driving members 100 is greater than 2.

[0093] As shown in FIG. 8, Figure 4 in some embodiments, the driving mechanism further includes a transmission belt pre-tightening mechanism 700 for keeping the transmission belt 600 in a tensioned state.

[0094] In these embodiments, the present application provides a transmission belt pre-tightening device for use in a mechanical transmission system. This device is generally used to ensure that the transmission belt 600 (such as a belt) maintains an appropriate tension during operation, thereby ensuring transmission efficiency and reducing the phenomenon of slipping.

[0095] Exemplarily, the transmission belt pre-tightening mechanism 700 can be an adjustable tensioning device, a swing tensioning device, a double tensioning device, a meshing tensioning device or a ball screw pre-tightening mechanism, etc.

[0096] As shown in FIG. 8, Figure 7 , Figure 8 ,Figure 9 As shown in Figure 10 In some embodiments, the transmission belt fixing member 500 comprises a base 550, and the base 550 is provided with a clamping portion 530 for clamping the transmission belt 600.

[0097] In these embodiments, the free end 610 of the transmission belt 600 is loosened or clamped by the clamping portion 530 to realize the disassembly and assembly of the transmission belt 600, and the whole installation process is convenient and fast, which is beneficial to subsequent maintenance.

[0098] For example, the clamping portion 530 is a clamping jaw. Of course, the clamping portion 530 can also be a buckle, a screw, etc.

[0099] In some embodiments, the transmission belt fixing member 500 comprises a base 550, and the base 550 is provided with a fixing column 520 for penetrating through the hole on the transmission belt 600 or the loop formed by folding back the free end 610 of the transmission belt 600 to fix the transmission belt 600.

[0100] In these embodiments, the hole or loop is constructed in advance on the free end 610 of the transmission belt 600, and the fixing column 520 is arranged in the hole or loop to realize the fixing.

[0101] For example, in this embodiment, the free end 610 of the transmission belt 600 is folded back and arranged and fixed to form a loop. Of course, in other embodiments, a hole can also be formed on the free end 610, or the free end 610 is connected with a shaft sleeve, and the inner hole of the shaft sleeve forms a hole.

[0102] As shown in Figure 7 , Figure 8 , Figure 9 and Figure 10 In some embodiments, the transmission belt fixing member 500 comprises a base 550, and the base 550 is provided with a clamping portion 530 and a fixing column 520. The clamping portion 530 is used for clamping the transmission belt 600, and the fixing column 520 is used for penetrating through the hole on the transmission belt 600 or the loop formed by folding back the free end 610 of the transmission belt 600 to fix the transmission belt 600.

[0103] ​​In these embodiments, the transmission belt fixing member 500 realizes reliable fixing of the transmission belt 600 through the cooperation of the base 550, the fixing column 520 and the clamping portion 530. The base 550 is used to connect the synchronous belt. The fixing column 520 is used to pass through the hole formed by the free end 610 of the transmission belt 600 to fix the position of the transmission belt 600. It should be noted that in this embodiment, the fixing column 520 is arranged in the loop formed by the folding back of the free end 610, and at this time the clamping portion 530 is used to clamp the overlapping portion formed by the folding back of the free end 610 to close the hole and ensure the fixing effect. Of course, in other embodiments, if the fixing column 520 is arranged in the hole of the free end 610, the clamping portion 530 is used to clamp the single-layer free end 610.

[0104] Exemplarily, the base 550 is generally a flat plate or a frame structure, which has sufficient strength and stability. The base 550 can be made of metal (such as steel, aluminum alloy) or high-strength plastic. Optionally, the base 550 is fixed on the synchronous belt by means of bolts, buckles or the like. The base 550 is located near the free end 610 of the belt to ensure that the fixing column 520 and the clamping portion 530 can effectively act on the belt.

[0105] Exemplarily, the fixing column 520 is arranged in a cylindrical or rod shape, which has an appropriate length and diameter. Similarly, the fixing column 520 is made of metal (such as steel, stainless steel) or high-strength plastic. Optionally, the fixing column 520 is fixed on the base 550, usually by screwing or welding. Alternatively, the fixing column 520 and the base 550 are integrally arranged. The fixing column 520 passes through the insertion hole formed by the free end 610 of the belt to fix the position of the belt.

[0106] Exemplarily, the clamping portion 530 can also be made of metal (such as steel, aluminum alloy) or high-strength plastic. The clamping portion 530 is fixed on the base 550, usually by bolts or welding. The clamping portion 530 clamps the portion engaged by the free end 610 of the synchronous belt and the middle portion to ensure the fixing effect.

[0107] Obviously, through the double action of the fixing column 520 and the clamping portion 530, it is ensured that the free end 610 of the synchronous belt will not be loose or fall off. The design of the transmission belt fixing member 500 makes the synchronous belt maintain appropriate tension during operation, which improves the transmission efficiency and stability.

[0108] As Figure 7 , Figure 8 and Figure 9As shown, in some embodiments, the clamping portion 530 comprises a first clamping block 531 and a second clamping block 532, the first clamping block 531 and / or the second clamping block 532 is movably fixed to the base 550, a clamping gap 535 is formed between the first clamping block 531 and the second clamping block 532, the clamping gap 535 is used to accommodate the transmission belt 600; the clamping gap 535 gradually decreases in width when the first clamping block 531 and the second clamping block 532 are close to each other, so as to gradually compress the transmission belt 600; the clamping gap 535 gradually increases in width when the first clamping block 531 and the second clamping block 532 are away from each other, so as to gradually loosen the transmission belt 600.

[0109] In these embodiments, the clamping portion 530 has the following structures:

[0110] Firstly, the first clamping block 531 is movably fixed to the base 550, the second clamping block 532 is fixed to the base 550, and the first clamping block 531 is movable relative to the second clamping block 532 to adjust the clamping gap 535 therebetween. Obviously, in actual use, the position of the first clamping block 531 is adjusted to achieve the purpose of adjusting the clamping gap 535.

[0111] Exemplarily, the first clamping block 531 and the second clamping block 532 are oppositely arranged, and the first clamping block 531 is movable along the opposite direction of the second clamping block 532.

[0112] Secondly, the second clamping block 532 is movably fixed to the base 550, and the first clamping block 531 is fixed to the base 550. In this case, the principle is the same as the first case, which will not be described here.

[0113] Thirdly, the first clamping block 531 and the second clamping block 532 are both movably fixed to the base 550, that is, the first clamping block 531 and the second clamping block 532 are moved respectively to make them close or away from each other, so as to adjust the clamping gap 535.

[0114] Obviously, in any of the above cases, it is necessary to ensure that the width of the clamping gap 535 is less than the thickness of the free end 610 in the clamping gap 535, so as to achieve the clamping purpose.

[0115] Of course, as Figure 11 shown, in other embodiments, the transmission belt 600 is a synchronous belt with a tooth groove, and the free end 610 of the transmission belt 600 is folded back to form a lap after the loop is formed. At this time, the first clamping block 531 and the second clamping block 532 are both fixedly arranged on the base 550, and the clamping gap 535 is limited to be less than the thickness of the folded back part of the free end 610, so as to prevent the folded back part of the free end 610 from separating.

[0116] AsFigure 7 、 Figure 8 and Figure 9 As shown in

[0117] In these embodiments, the adjustment member 534 is used to adjust the relative positions of both the first clamping block 531 and the second clamping block 532 to change the width of the clamping gap 535.

[0118] Illustratively, the adjustment member 534 is an adjustment bolt, one end of which is threadedly connected to the hole wall of the threaded hole in one of the first clamping block 531 and the second clamping block 532, and the other end of which passes through the through hole in the other of the first clamping block 531 and the second clamping block 532 to adjust the distance between the first clamping block 531 and the second clamping block 532, thereby ensuring that the free end 610 of the drive belt 600 can be securely fixed in the clamping gap 535.

[0119] That is, the adjustment bolt is a rod-shaped component with threads. By rotating the adjustment bolt, the distance between the first clamping block 531 and the second clamping block 532 is adjusted, thereby adjusting the size of the clamping gap 535.

[0120] Illustratively, in this embodiment, the number of adjustment bolts is one. Of course, in other embodiments, the number of adjustment bolts is two, three, four, etc.

[0121] As shown in Figure 8 and Figure 9 In some embodiments, the clamping portion 530 includes a guide member 533 for limiting the movement path of the first clamping block 531 and / or the second clamping block 532.

[0122] In these embodiments, the guide member 533 is used to limit the movement path of the first clamping block 531 and / or the second clamping block 532 to ensure that the clamping blocks move smoothly along a predetermined path when clamping and releasing the drive belt 600. This design helps to improve the stability and reliability of the clamping portion 530, while simplifying the operation process.

[0123] Illustratively, the guide member 533 includes a guide slot and a guide pin, the first clamping block 531: for clamping one end of the drive belt 600. The second clamping block 532: for clamping the other end of the drive belt 600. The guide slot: a long strip-shaped groove provided on the base 550 for guiding the movement of the first clamping block 531 and / or the second clamping block 532. The guide pin: a pin fixed on the first clamping block 531 and / or the second clamping block 532, which is embedded in the guide slot to ensure that the clamping block moves along a predetermined path.

[0124] Pushing the first clamping block 531 and / or the second clamping block 532 to move the guide pin along the guide groove until the clamping block clamps the drive belt 600. Pulling the first clamping block 531 and / or the second clamping block 532 to move the guide pin along the guide groove until the clamping block loosens the drive belt 600. Obviously, the guide groove and the guide pin ensure that the clamping block moves along the predetermined path without deviation. The clamping and loosening operations can be completed by simple pushing and pulling actions.

[0125] Illustratively, the guide 533 includes a guide rail and a sliding block. The guide rail is a linear guide rail fixed on the base 550 and used to guide the movement of the first clamping block 531 and / or the second clamping block 532. The sliding block is a sliding block fixed on the first clamping block 531 and / or the second clamping block 532 and embedded in the guide rail to ensure smooth movement of the clamping block along the guide rail. Pushing the first clamping block 531 and / or the second clamping block 532 to move the sliding block along the guide rail until the clamping block clamps the drive belt 600. Pulling the first clamping block 531 and / or the second clamping block 532 to move the sliding block along the guide rail until the clamping block loosens the drive belt 600. The guide rail and the sliding block provide high-precision guidance to ensure that the movement path of the clamping block is consistent.

[0126] Illustratively, the guide 533 includes a fixed block having a guide slope, the guide slope cooperates with the slope of the second clamping block 532, and the distance between the guide slope and the first clamping block 531 gradually increases in the direction away from the fixed column 520. Under the action of the free end 610 being pulled back (or loosened), the free end 610 can drive the second clamping block 532 to move along the guide slope to further approach the first clamping block 531, thereby improving the clamping and fixing effect.

[0127] Illustratively, in this embodiment, the guide slope is provided as an inclined plane. Of course, in other embodiments, the guide slope can also be provided as an arc surface or an arc-like surface.

[0128] As shown in Figure 10 some embodiments, the first clamping block 531 and / or the second clamping block 532 have a tooth portion for gradually abutting and compressing the drive belt 600 when the first clamping block 531 and the second clamping block 532 approach each other.

[0129] In some embodiments, this design not only improves the reliability and stability of clamping, but also ensures that the drive belt 600 is uniformly stressed during clamping, thereby reducing the risk of damage.

[0130] For example, the first clamping block 531 has a straight toothed portion for clamping one end of the drive belt 600. The second clamping block 532 has a straight toothed portion for clamping the other end of the drive belt 600. Pushing the first clamping block 531 and the second clamping block 532 causes the straight toothed portions to gradually press against and tighten the drive belt 600. Pulling the first clamping block 531 and the second clamping block 532 causes the straight toothed portions to gradually move away from the drive belt 600 until they are completely released.

[0131] For example, the first clamping block 531 has helical teeth for clamping one end of the drive belt 600. The second clamping block 532 has helical teeth for clamping the other end of the drive belt 600. Pushing the first clamping block 531 and the second clamping block 532 causes the helical teeth to gradually press against and tighten the drive belt 600. Pulling the first clamping block 531 and the second clamping block 532 causes the helical teeth to gradually move away from the drive belt 600 until they are completely released.

[0132] The way in which the first holding block 531 and the second holding block 532 approach or move away can be by rotation or translation, and no specific limitation is made here.

[0133] like Figure 4 and Figure 9 As shown, in some embodiments, the transmission belt fixing member 500 further includes a parallel arm fixing bracket 540, which is disposed on the base 550 and is used to fix the parallel arm; the parallel arm fixing bracket 540 has a clearance channel through which the transmission belt 600 passes.

[0134] In these embodiments, the parallel arm mounting bracket 540 is connected to the parallel arm for movable connection between the parallel arm and the effector. A clearance channel is provided on the parallel arm mounting bracket 540 to facilitate the installation of pretensioning of the drive belt 600.

[0135] For example, the parallel arm fixing bracket 540 is configured as a gantry structure. Of course, in other embodiments, the parallel arm fixing bracket 540 may also be configured as an L-shaped structure, etc.

[0136] like Figure 4 As shown, in some embodiments, the drive belt fastener 500 further includes a movable component 560, and the base 550 is fixed on the movable component 560.

[0137] In these embodiments, by providing the moving part 560, the direction of movement of the base 550 can be limited, and the movement of the base 550 can be made smoother.

[0138] For example, the movable component 560 mates with the guide rail, that is, the base 550 and the guide rail are slidably connected. Of course, the movable component 560 mates with the slide groove, which is equivalent to the base 550 and the slide groove being slidably connected, and so on.

[0139] In a second aspect, as shown in Figure 3 The application also provides a column 300 assembly, which comprises:

[0140] The drive mechanism as described in any one of the above embodiments;

[0141] A column 300, the transmission wheel 800 is rotatably fixed on the column 300;

[0142] A first guide 400 is arranged on the column 300, extending along the height direction X of the column 300. The moving part 560 on the transmission belt fixing part 500 cooperates with the first guide 400, so that the transmission belt fixing part 500 can reciprocate along the first guide 400 under the drive of the drive part 100.

[0143] It is obvious from these embodiments that the column 300 assembly of the 3D printer, in addition to the motor and the transmission wheel 800, also includes other key components such as the column 300, the first guide 400 and the transmission belt fixing part 500. These components work together to ensure that the effector (i.e. the print head) can move accurately and stably.

[0144] Among them, the column 300 is the basic structure of the entire column 300 assembly, which provides support and defines the path of the effector moving in the preset direction (usually vertical or Z-axis). A plurality of transmission wheels 800 are installed on the column 300, and the transmission wheels 800 are connected to the column 300 through bearings or other rotating devices, so that the transmission wheels 800 can rotate freely without affecting the stability of the column 300.

[0145] The first guide 400, the transmission belt fixing part 500, the parallel arm, the ball shaft and the effector are connected in sequence, and the first guide 400 provides a smooth sliding path for the effector to ensure its straightness and stability during movement. The first guide 400 is fixed on the column 300 and usually extends along the length direction of the column 300, so as to guide the effector to move accurately along this direction.

[0146] The transmission belt fixing part 500 fixes one side of the transmission belt 600 and is connected to the first guide 400. When the motor drives the transmission wheel 800 to rotate, the transmission belt fixing part 500 drives the effector to move along the first guide 400 through the transmission of the transmission belt 600. The transmission belt fixing part 500 is designed to be firmly connected with the transmission belt 600 and can smoothly slide on the first guide 400. This can be achieved through a sliding block mechanism to reduce friction and ensure smooth movement.

[0147] Obviously, the motor drive transmission wheel 800 in the present application rotates, and power is transmitted to the transmission belt fixing member 500 through the transmission belt 600. The transmission belt fixing member 500 fixes a part of the transmission belt 600, and slides along the first guide rail with the movement of the transmission belt 600, thereby driving the effector to move. This design combines the advantages of mechanical transmission and linear guidance, and can ensure high precision while improving the reliability and durability of the system. For a 3D printer that needs to run for a long time, such a structure can effectively reduce maintenance costs and improve printing quality and efficiency.

[0148] Exemplarily, the first guide part 400 is a guide rail. Of course, in other embodiments, the first guide part 400 can also be a guide groove or a guide rod, etc.

[0149] As Figure 3 shown, in some embodiments, the column 300 assembly further comprises a limit switch 200, which is arranged at both ends of the movement path of the transmission belt fixing member 500.

[0150] In these embodiments, this design is used to detect the limit position of the transmission belt fixing member 500 (print head) on its movement path, to ensure that it operates within a safe working range.

[0151] The limit switch 200 is used to detect whether the transmission belt fixing member 500 reaches the preset limit position. When the transmission belt fixing member 500 reaches the limit position, the limit switch 200 will trigger, send a signal to the controller, stop the motor drive or switch the motor operation direction, to prevent exceeding the working range.

[0152] Exemplarily, in the present embodiment, the limit switch 200 is a mechanical limit switch 200, which is triggered by physical contact, usually having a movable contact and a fixed contact. Of course, in other embodiments, the limit switch 200 is a non-contact limit switch 200, such as an optical switch, a magnetic switch, etc., which can be triggered without physical contact.

[0153] Among them, the limit part 510 is used to contact and trigger the limit switch 200, and the limit part 510 is a structure installed on the transmission belt fixing member 500, which triggers the corresponding limit switch 200 when the transmission belt fixing member 500 moves to the limit position. It should be noted that the design of the limit part 510 should ensure that it can accurately trigger the limit switch 200 when the transmission belt fixing member 500 reaches the limit position.

[0154] Exemplary, two limit switches 200 are installed on the column 300 assembly, respectively located at the two ends of the moving path of the transmission belt fixing member 500. The transmission belt fixing member 500 is provided with a limiting part 510, which is located between the two limit switches 200. When the transmission belt fixing member 500 moves on the first guide rail, the limiting part 510 will not trigger any limit switch 200, and the system will operate normally. The controller controls the motor to drive the transmission belt fixing member 500 to move according to other instructions. If the transmission belt fixing member 500 moves to the upper limit or lower limit position, the limiting part 510 will trigger the corresponding limit switch 200. After the limit switch 200 is triggered, it will immediately send a signal to the controller. After the controller receives the signal of the limit switch 200, it will immediately stop the motor drive or control the motor to drive in reverse, preventing the transmission belt fixing member 500 from continuing to move beyond the working range. Obviously, this mechanism can prevent hardware damage and ensure the safety of the system.

[0155] As shown in Figure 5 and Figure 6 In some embodiments, the column 300 assembly further comprises a transmission belt pre-tightening mechanism 700, which comprises a pre-tightening wheel 720, a pre-tightening adjusting member 730, a pre-tightening mounting seat 750, a second guide part 740 and an elastic part 710. The pre-tightening wheel 720 is rotatably mounted on the pre-tightening adjusting member 730. The second guide part 740 is provided on the pre-tightening mounting seat 750, which is used for fixing and mounting the transmission belt pre-tightening mechanism 700. The extension direction of the second guide part 740 is consistent with that of the first guide part 400. The pre-tightening adjusting member 730 cooperates with the second guide part 740, and the second guide part 740 is used to limit the movement path of the pre-tightening adjusting member 730.

[0156] One end of the elastic part 710 is connected to the pre-tightening adjusting member 730, and the other end is connected to the pre-tightening mounting seat 750. The transmission belt 600 is sleeved on the pre-tightening wheel 720, so that the pre-tightening adjusting member 730 moves along the second guide part 740 to compress the elastic part 710, and the elastic part 710 is in an elastic deformation state.

[0157] In these embodiments, the present application provides a transmission belt pre-tightening mechanism 700 for use in a mechanical transmission system. This device is generally used to ensure that the transmission belt 600 (such as a belt) maintains an appropriate tension during operation, thereby ensuring transmission efficiency and reducing the phenomenon of slipping.

[0158] The pre-tightening wheel 720 is rotatably mounted on the pre-tightening adjusting member 730 to contact and tighten the transmission belt 600. The pre-tightening adjusting member 730 is used to adjust the position of the pre-tightening wheel 720, thereby adjusting the tension of the transmission belt 600. The pre-tightening wheel 720 is usually a small roller, which can rotate freely to ensure that the transmission belt 600 is not damaged during the tightening process. The pre-tightening adjusting member 730 can be a sliding block or a sliding rod, which is moved along the second guide part 740 by manual or automatic means to adjust the position of the pre-tightening wheel 720.

[0159] The pre-tightening mounting base 750 is fixedly mounted on the column 300 assembly to support the entire pre-tightening mechanism.

[0160] The second guide part 740 is arranged on the pre-tightening mounting base 750 and is consistent with the extension direction of the first guide part 400, and is used to limit the movement path of the pre-tightening adjusting member 730. For example, the second guide part 740 is a sliding rail, a sliding groove or a guide rod.

[0161] One end of the elastic part 710 is connected to the pre-tightening adjusting member 730, and the other end is connected to the pre-tightening mounting base 750, which is used to provide an elastic force to keep the pre-tightening wheel 720 pressing the transmission belt 600. The elastic part 710 can be a spring or other elastic element, which provides a pre-tightening force to keep the pre-tightening wheel 720 pressing the transmission belt 600.

[0162] The transmission belt 600 is sleeved on the pre-tightening wheel 720, and the pre-tightening wheel 720 is rotated and the pre-tightening adjusting member 730 is moved to maintain an appropriate tension.

[0163] Obviously, the pre-tightening adjusting member 730 is moved by an automatic means to move the pre-tightening wheel 720 along the second guide part 740. The movement of the pre-tightening adjusting member 730 will compress the elastic part 710, so that the elastic part 710 is in an elastic deformation state. The elastic force of the elastic part 710 is transmitted to the pre-tightening wheel 720 through the pre-tightening adjusting member 730, so that the pre-tightening wheel 720 exerts a pressure on the transmission belt 600, thereby adjusting the tension of the transmission belt 600. When the required tension is reached, the position of the pre-tightening adjusting member 730 is fixed by a locking mechanism to ensure that the pre-tightening wheel 720 remains stable during operation. That is, the design of the elastic part 710 enables the pre-tightening wheel 720 to automatically adjust the tension and adapt to the expansion and contraction of the transmission belt 600.

[0164] In some embodiments, the application also provides a 3D printer, which comprises a parallel arm, an effector and the column 300 assembly of any one of the above embodiments, one end of the parallel arm is movably connected to the effector, and the other end is movably connected to the transmission belt fixing member 500 of the column 300 assembly.

[0165] Since the column 300 assembly has the above technical effects, the 3D printer comprising the column 300 assembly should have the same technical effects, which will not be described here.

[0166] Exemplarily, one end of the parallel arm is connected with the effector through a ball shaft, and the other end of the parallel arm is connected with the parallel arm fixing frame 540 through a ball shaft.

[0167] Exemplarily, in the embodiment, the 3D printer is an FDM (Fused Deposition Modeling) type 3D printer. Of course, in other embodiments, the 3D printer can also be an SLA (Stereolithography) type 3D printer, etc.

[0168] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not as a limitation, and thus other examples of the exemplary embodiments can have different values.

[0169] It should be noted that: similar labels and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0170] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that, for ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A reciprocating movement drive mechanism, characterized by, The driving mechanism comprises: at least two transmission wheels, a transmission belt fixing member and a transmission belt, the transmission belt being sleeved on the at least two transmission wheels, the transmission belt fixing member being fixedly connected on the transmission belt; at least two driving members, each of the driving members driving one of the transmission wheels to rotate, all the transmission wheels being capable of synchronously rotating to drive the transmission belt to rotate and to drive the transmission belt fixing member to move.

2. The drive mechanism of claim 1, wherein, The driving mechanism further comprises at least one of the following technical features: the first item: the driving member comprises a motor, a main shaft of the motor being coaxially connected with the corresponding transmission wheel; the second item: the transmission belt is a belt, and the transmission wheel is a synchronous pulley; the third item: the transmission belt has two free ends, the free ends being detachably connected with the transmission belt fixing member; the fourth item: the number of the transmission wheels is 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12; and the number of the driving members is 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12; the fifth item: the driving mechanism further comprises a transmission belt pre-tightening mechanism for keeping the transmission belt in a tensioned state.

3. Drive mechanism according to claim 1 or 2, characterized in that The transmission belt fixing member comprises a base, the base being provided with a clamping portion for clamping and fixing the transmission belt; and / or, the transmission belt fixing member comprises a base, the base being provided with a fixing column for penetrating through a hole on the transmission belt or a loop formed by folding back a free end of the transmission belt to fix the transmission belt.

4. The drive mechanism of claim 3, wherein, The clamping portion comprises a first clamping block and a second clamping block, the first clamping block and / or the second clamping block being movably fixed to the base, a clamping gap being formed between the first clamping block and the second clamping block for accommodating the transmission belt, the clamping gap gradually decreasing in width when the first clamping block and the second clamping block move closer to each other to gradually press the transmission belt, and the clamping gap gradually increasing in width when the first clamping block and the second clamping block move away from each other to gradually release the transmission belt.

5. The drive mechanism of claim 4, wherein, The clamping portion further comprises at least one of the following technical features: the first item: the clamping portion comprises an adjusting member for adjusting the distance between the first clamping block and the second clamping block to change the width of the clamping gap; the second item: the clamping portion comprises a guide member for limiting the movement path of the first clamping block and / or the second clamping block; the third item: the first clamping block and / or the second clamping block has a tooth portion for gradually abutting and pressing the transmission belt when the first clamping block and the second clamping block move closer to each other.

6. The drive mechanism of claim 3, wherein, The transmission belt fixing member further comprises at least one of the following technical features: the first item: the transmission belt fixing member further comprises a parallel arm fixing frame, the parallel arm fixing frame being provided on the base, the parallel arm fixing frame having an avoiding passage, the transmission belt being arranged in the avoiding passage; the second item: the transmission belt fixing member further comprises a moving member, the base being fixed on the moving member.

7. A column assembly characterized by, The stand column assembly comprises: The drive mechanism as claimed in any one of claims 1 to 6; A column, the transmission wheel is rotatably fixed on the column; A first guide part is arranged on the column and extends along the height direction of the column; the moving part on the transmission belt fixing member cooperates with the first guide part, so that the transmission belt fixing member can reciprocate along the first guide part under the drive of the drive member.

8. The column assembly of claim 7, wherein, The column assembly further comprises: A limit switch is arranged at both ends of the moving path of the transmission belt fixing member.

9. The column assembly of claim 7, wherein, The column assembly further comprises a transmission belt pre-tightening mechanism, which comprises a pre-tightening wheel, a pre-tightening adjusting member, a pre-tightening mounting base, a second guide part and an elastic part; the pre-tightening wheel is rotatably mounted on the pre-tightening adjusting member; the second guide part is arranged on the pre-tightening mounting base, which is used for fixing the pre-tightening mechanism; the second guide part is consistent with the extending direction of the first guide part; the pre-tightening adjusting member cooperates with the second guide part, and the second guide part is used for limiting the moving path of the pre-tightening adjusting member; One end of the elastic part is connected with the pre-tightening adjusting member, and the other end is connected with the pre-tightening mounting base; the transmission belt is sleeved on the pre-tightening wheel, so that the pre-tightening adjusting member moves along the second guide part to compress the elastic part, and the elastic part is in an elastic deformation state.

10. A 3D printer characterized by, The 3D printer comprises a parallel arm, an effector and the column assembly as claimed in any one of claims 7 to 9; one end of the parallel arm is movably connected with the effector, and the other end is movably connected with the transmission belt fixing member of the column assembly.

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