Bridge type gantry beam structure of numerical control machine tool

Abstract

The utility model discloses a bridge type gantry beam structure of a numerical control machine tool, and relates to the technical field of numerical control machine tools. The anti-loosening device comprises two bases, a cross beam is installed on the tops of the two bases, the anti-loosening device further comprises two sets of anti-loosening parts, the two sets of anti-loosening parts are installed in the two bases respectively, and the two sets of anti-loosening parts are used for enhancing the connection relation between the cross beam and the two bases; and the balance part is mounted outside the cross beam. Through the anti-loosening part, specifically after the cross beam and the base are connected through the bolt, the connecting block on the cross beam slides into the connecting groove of the base, the rotary knob is rotated to drive the rotating shaft and the rhombic cam to rotate, the cam is in sliding fit with the sliding groove in the inner wall of the connecting block, the sliding groove is extruded to push the connecting block, and the pre-tightening force between the cross beam and the base is increased; therefore, the situation that the pre-tightening force is reduced due to vibration in the long-term use process of the cross beam is prevented, and then connection looseness is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of CNC machine tool technology, and in particular relates to a bridge-type gantry beam structure for CNC machine tools. Background Technology

[0002] As a key piece of equipment in modern manufacturing, CNC machine tools play an irreplaceable role in many fields due to their high precision, high efficiency and high automation. The bridge-type gantry beam, as a core component of CNC machine tools, directly affects the overall machining accuracy and stability of the machine tool.

[0003] Currently, most bridge-type gantry beams are connected to the base using traditional bolt connections. However, during long-term machine tool operation, the continuous vibrations generated by cutting processes introduce certain drawbacks to this connection method. For example, vibrations can gradually reduce the bolt preload, potentially causing the connection between the beam and the base to loosen. Loose connections can affect the stability of the beam during operation, leading to reduced machining accuracy and potential issues such as dimensional deviations and increased surface roughness in the machined workpieces. In severe cases, this can even result in workpiece scrap, increasing production costs and reducing production efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a bridge-type gantry beam structure for CNC machine tools. By incorporating an anti-loosening component, specifically after the beam and base are bolted together, a connecting block on the beam slides into the connecting groove of the base. Rotating the knob drives the rotating shaft and the diamond-shaped cam to rotate. The cam slides into the groove on the inner wall of the connecting block, squeezing the groove and pushing the connecting block, increasing the preload between the beam and the base. This prevents the preload from decreasing due to vibration during long-term use, thus avoiding loosening of the connection. This solves the problem that common bridge-type gantry beams often use traditional bolt connections to the base. During long-term machine tool operation, continuous vibration from cutting processes causes certain defects in this connection method. For example, vibration can gradually reduce the bolt preload, potentially leading to loosening of the connection between the beam and the base.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to a bridge-type gantry beam structure for CNC machine tools, comprising two bases, with a crossbeam mounted on the top of the two bases, and further comprising:

[0007] The anti-loosening part is provided in two sets, which are respectively installed inside the two bases. The two sets of anti-loosening parts are used to strengthen the connection between the crossbeam and the two bases; and

[0008] A balancing component is installed on the outside of the crossbeam and is used to balance the inertial load of the crossbeam during movement.

[0009] The crossbeam is connected to the two bases by bolts, and the components and working principles of the two anti-loosening parts are exactly the same.

[0010] Furthermore, the anti-loosening part includes a connecting assembly, which is installed inside the base and on the top of the base, and is used to connect the base and the crossbeam; and

[0011] A locking assembly, which is installed inside the base, is used to strengthen the connection between the base and the crossbeam;

[0012] The connecting components and locking components work together to strengthen the preload between the crossbeam and the base, preventing the connection from loosening.

[0013] Furthermore, the balancing component includes a lightweight assembly mounted inside the base, the lightweight assembly serving to reduce the weight of the crossbeam; and

[0014] A balancing assembly, which is installed on the outside of the crossbeam, is used to balance the inertial forces generated by the crossbeam during movement.

[0015] A limiting component is installed on the outside of the crossbeam and is used to limit the balancing component.

[0016] Among them, the balancing and limiting components are used to dynamically adjust the mass distribution to counteract the inertial force of the beam movement, thereby reducing the redundant strength required for the static design of the beam and achieving the purpose of lightweighting.

[0017] Furthermore, the connecting assembly includes a connecting block fixedly connected to the bottom of the crossbeam, the top of the base is provided with a connecting groove, and the bottom of the connecting block extends into the interior of the connecting groove and is slidably connected to the connecting groove.

[0018] The connecting block is U-shaped.

[0019] Furthermore, the locking assembly includes a rotating shaft rotatably connected to the left side of the base, the right end of the rotating shaft extending into the interior of the base, a cam fixedly connected to the outer wall of the rotating shaft, two sliding grooves formed on the inner wall of the connecting block, the cam slidingly connected to the sliding grooves, and a knob fixedly connected to the left end of the rotating shaft.

[0020] The cam is rhomboid in shape, and two grooves are distributed on the inner walls of both sides of the connecting block, arranged symmetrically from top to bottom.

[0021] Furthermore, the lightweight component includes several weight-reducing holes opened at the top and bottom of the crossbeam, and the inner wall of the crossbeam is provided with hollow steel, and several reinforcing steels are fixedly connected between the hollow steel and the inner wall of the crossbeam.

[0022] There are four reinforcing steels, and all four reinforcing steels are fixedly connected to the hollow steel and the crossbeam by welding.

[0023] Furthermore, the balancing assembly includes a motor installed on the left side of the crossbeam, the output shaft of the motor is fixedly connected to a bidirectional threaded rod via a coupling, the right end of the bidirectional threaded rod is rotatably connected to the crossbeam, and the outer wall of the bidirectional threaded rod is threaded with two internal threaded blocks, and counterweights are fixedly connected to the rear side of each of the two internal threaded blocks.

[0024] The bidirectional threaded rod is rotatably connected to the crossbeam via a bearing, and is located on the rear side of the crossbeam.

[0025] Furthermore, the limiting assembly includes several limiting rods fixedly connected to the front side of the two counterweights, and two limiting grooves are opened on the rear side of the crossbeam. The front ends of the several limiting rods extend into the interior of the corresponding limiting grooves and are slidably connected to the corresponding limiting grooves.

[0026] Each of the two counterweights has four limiting rods on its front side. The four limiting rods on the front side of each counterweight are evenly divided into two groups and are symmetrically distributed on the front side of the counterweight.

[0027] This utility model has the following beneficial effects:

[0028] 1. By setting an anti-loosening part, specifically after the crossbeam and the base are connected by bolts, the connecting block on the crossbeam slides into the connecting groove of the base. Turning the knob drives the rotating shaft and the diamond cam to rotate. The cam slides and engages with the sliding groove on the inner wall of the connecting block, squeezing the sliding groove and pushing the connecting block, increasing the preload between the crossbeam and the base, thereby preventing the preload from decreasing due to vibration during long-term use, and thus avoiding loosening of the connection.

[0029] 2. By setting up a balancing component, specifically when the crossbeam drives the tool or worktable to move linearly at high speed or accelerates or decelerates to generate inertial force, the motor starts and drives the bidirectional threaded rod to rotate. Because the threads at both ends of the bidirectional threaded rod are opposite in direction, the two internal threaded blocks move closer or further apart synchronously, driving the rear counterweight to move. When the crossbeam accelerates, the counterweight moves towards the center; when it decelerates or reverses, it moves towards both ends, generating a reverse force to counteract the inertial load. This, combined with the limit component, ensures stable operation and guarantees the balancing effect.

[0030] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0033] Figure 2 This is a schematic diagram of the rear view structure of this utility model;

[0034] Figure 3 This is a schematic diagram of the exploded structure of this utility model;

[0035] Figure 4 This is a schematic cross-sectional view of the crossbeam of this utility model;

[0036] Figure 5 This is a schematic diagram of the structure of the motor of this utility model;

[0037] Figure 6 This is a cross-sectional structural diagram of the base of this utility model;

[0038] Figure 7 This is a cross-sectional structural diagram of the connecting block of this utility model.

[0039] The attached diagram lists the components represented by each number as follows:

[0040] 1. Base; 11. Crossbeam; 2. Anti-loosening part; 21. Connecting assembly; 211. Connecting block; 212. Connecting groove; 22. Locking assembly; 221. Rotating shaft; 222. Cam; 223. Slide groove; 224. Knob; 3. Balancing part; 31. Lightweight assembly; 311. Weight reduction hole; 312. Hollow steel; 313. Reinforcing steel; 32. Balancing assembly; 321. Motor; 322. Bidirectional threaded rod; 323. Internal threaded block; 324. Counterweight block; 33. Limiting assembly; 331. Limiting rod; 332. Limiting slide groove. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0042] Please see Figure 1-7As shown, this utility model is a bridge-type gantry beam structure for CNC machine tools, including two bases 1, with a crossbeam 11 mounted on the top of the two bases 1, and also including:

[0043] Anti-loosening part 2, two sets of anti-loosening parts 2 are provided, and the two sets of anti-loosening parts 2 are respectively installed inside the two bases 1. The two sets of anti-loosening parts 2 are used to strengthen the connection between the crossbeam 11 and the two bases 1; and

[0044] The balancing part 3 is installed on the outside of the crossbeam 11 and is used to balance the inertial load of the crossbeam 11 during the movement process.

[0045] The crossbeam 11 is connected to the two bases 1 by bolts, and the components and working principles of the two sets of anti-loosening parts 2 are exactly the same.

[0046] The anti-loosening part 2 includes a connecting assembly 21, which is installed inside the base 1 and on the top of the base 1. The connecting assembly 21 is used to connect the base 1 and the crossbeam 11; and

[0047] Locking assembly 22 is installed inside the base 1 and is used to strengthen the connection between the base 1 and the crossbeam 11.

[0048] The connecting component 21 and the locking component 22 cooperate with each other to strengthen the preload between the crossbeam 11 and the base 1, preventing the connection from loosening.

[0049] The balancing unit 3 includes a lightweight component 31, which is installed inside the base 1 and is used to reduce the weight of the crossbeam 11; and

[0050] The balancing assembly 32 is installed on the outside of the crossbeam 11 and is used to balance the inertial force generated by the crossbeam 11 during movement.

[0051] Limiting component 33 is installed on the outside of crossbeam 11 and is used to limit the balance component 32.

[0052] The balancing component 32 and the limiting component 33 are used to dynamically adjust the mass distribution to counteract the inertial force of the crossbeam 11, thereby reducing the redundant strength required for the static design of the crossbeam 11 and achieving the purpose of lightweighting.

[0053] The connecting component 21 includes a connecting block 211 fixedly connected to the bottom of the crossbeam 11, a connecting groove 212 is provided on the top of the base 1, and the bottom of the connecting block 211 extends into the interior of the connecting groove 212 and is slidably connected to the connecting groove 212.

[0054] The inner wall of the connecting groove 212 is adapted to the outer wall of the connecting block 211.

[0055] The locking assembly 22 includes a rotating shaft 221 rotatably connected to the left side of the base 1. The right end of the rotating shaft 221 extends into the interior of the base 1. A cam 222 is fixedly connected to the outer wall of the rotating shaft 221. Two sliding grooves 223 are opened on the inner wall of the connecting block 211. The cam 222 is slidably connected to the sliding grooves 223. A knob 224 is fixedly connected to the left end of the rotating shaft 221.

[0056] The knob 224 is fixedly connected to the rotating shaft 221 by welding.

[0057] The lightweight component 31 includes several weight-reducing holes 311 opened at the top and bottom of the crossbeam 11, and hollow steel 312 is provided on the inner wall of the crossbeam 11. Several reinforcing steels 313 are fixedly connected between the hollow steel 312 and the inner wall of the crossbeam 11.

[0058] Hollow steel 312 is fixedly connected to crossbeam 11 by reinforcing steel 313.

[0059] The balancing assembly 32 includes a motor 321 installed on the left side of the crossbeam 11. The output shaft of the motor 321 is fixedly connected to a bidirectional threaded rod 322 via a coupling. The right end of the bidirectional threaded rod 322 is rotatably connected to the crossbeam 11. The outer wall of the bidirectional threaded rod 322 is threaded with two internal threaded blocks 323. A counterweight block 324 is fixedly connected to the rear side of each of the two internal threaded blocks 323.

[0060] The two counterweights 324 are fixedly connected to the two internal threaded blocks 323 by welding.

[0061] The limiting component 33 includes several limiting rods 331 fixedly connected to the front side of the two counterweights 324. Two limiting grooves 332 are opened on the rear side of the crossbeam 11. The front ends of the several limiting rods 331 extend into the interior of the corresponding limiting grooves 332 and are slidably connected to the corresponding limiting grooves 332.

[0062] Among them, the limiting rods 331 on the two counterweights 324 are respectively adapted to the corresponding limiting grooves 332.

[0063] A specific application of this embodiment is as follows: When using the crossbeam 11, the crossbeam 11 is first connected to the base 1 by bolts. When the crossbeam 11 is connected to the base 1, the bottom of the connecting block 211 on the crossbeam 11 extends into the connecting groove 212 at the top of the base 1. After the crossbeam 11 is connected to the base 1, the knob 224 is rotated, which will also drive the rotating shaft 221 to rotate. The diamond-shaped cam 222 on the rotating shaft 221 rotates accordingly. The cam 222 slides and engages with the sliding grooves 223 symmetrically distributed on both sides of the inner wall of the connecting block 211. As the cam 222 rotates, it will exert a squeezing effect on the sliding grooves 223, thereby pushing the connecting block 211 and increasing the preload between the crossbeam 11 and the base 1. This effectively prevents the preload between the crossbeam 11 and the base 1 from decreasing due to long-term vibration, thus preventing the connection from becoming loose.

[0064] Meanwhile, for the lightweight design of the crossbeam 11, the weight-reducing holes 311 evenly opened at the top and bottom of the crossbeam 11 directly reduce the amount of material used in the crossbeam 11, thereby reducing its weight. The hollow steel 312 inside the crossbeam 11, together with the four reinforcing steels 313 fixed around it by welding, further achieves lightweighting while ensuring the overall strength of the crossbeam 11. When the crossbeam 11 drives the tool or worktable to perform high-speed linear motion or acceleration and deceleration motion, inertial force is generated. At this time, the balance part 3 plays a role, the motor 321 starts, and its output shaft drives the bidirectional threaded rod 322 to rotate through the coupling. Since the threads at both ends of the outer wall of the bidirectional threaded rod 322 are opposite in direction, the two internal threaded blocks 323 connected to it rotate with the bidirectional threaded rod 322. When the beam 11 moves, it will move towards the center or away from both ends in sync. The counterweight 324 welded to the rear side of the internal thread block 323 will also move accordingly. When the beam 11 accelerates to one side, the two counterweights 324 move towards the center of the beam 11. The movement of the counterweights 324 generates a force opposite to the inertial force of the beam 11. When the beam 11 decelerates or moves in the opposite direction, the counterweights 324 move towards both ends, generating the opposite force, thereby counteracting the inertial load during the movement of the beam 11. During the movement of the counterweights 324, the limiting rod 331 on its front side slides in the limiting groove 332 on the rear side of the beam 11 to limit the movement of the counterweights 324, ensuring that it moves smoothly along a straight line, so that the balancing component 32 can stably play the role of balancing inertial force.

[0065] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A bridge-type gantry beam structure for a CNC machine tool, comprising two bases (1), with a crossbeam (11) mounted on the top of the two bases (1), characterized in that, Also includes: Anti-loosening part (2), the anti-loosening part (2) is provided in two sets, the two sets of anti-loosening parts (2) are respectively installed inside the two bases (1), the two sets of anti-loosening parts (2) are used to strengthen the connection between the crossbeam (11) and the two bases (1); and A balancing part (3) is installed on the outside of the crossbeam (11) and is used to balance the inertial load of the crossbeam (11) during movement. The crossbeam (11) is connected to the two bases (1) by bolts, and the components and working principle of the two sets of anti-loosening parts (2) are exactly the same.

2. The bridge-type gantry beam structure for CNC machine tools according to claim 1, characterized in that, The anti-loosening part (2) includes a connecting assembly (21), which is installed inside the base (1) and on the top of the base (1). The connecting assembly (21) is used to connect the base (1) and the crossbeam (11); and A locking assembly (22) is installed inside the base (1) and is used to strengthen the connection between the base (1) and the crossbeam (11); The connecting component (21) and the locking component (22) cooperate with each other to strengthen the preload between the crossbeam (11) and the base (1) and prevent the connection from loosening.

3. The bridge-type gantry beam structure for a CNC machine tool according to claim 2, characterized in that, The balancing part (3) includes a lightweight component (31) which is installed inside the base (1) and is used to reduce the weight of the crossbeam (11). as well as A balancing assembly (32) is installed on the outside of the crossbeam (11) and is used to balance the inertial force generated by the crossbeam (11) during movement. A limiting component (33) is installed on the outside of the crossbeam (11) and is used to limit the balancing component (32); Among them, the dynamic adjustment of mass distribution by the balancing component (32) and the limiting component (33) is used to counteract the motion inertial force of the crossbeam (11), thereby reducing the redundant strength required for the static design of the crossbeam (11) and achieving the purpose of lightweighting.

4. The bridge-type gantry beam structure for a CNC machine tool according to claim 3, characterized in that, The connecting component (21) includes a connecting block (211) fixedly connected to the bottom of the crossbeam (11), and a connecting groove (212) is provided on the top of the base (1). The bottom of the connecting block (211) extends into the interior of the connecting groove (212) and is slidably connected to the connecting groove (212). The connecting block (211) is U-shaped.

5. A bridge-type gantry beam structure for a CNC machine tool according to claim 4, characterized in that, The locking assembly (22) includes a rotating shaft (221) rotatably connected to the left side of the base (1), the right end of the rotating shaft (221) extending into the interior of the base (1), a cam (222) fixedly connected to the outer wall of the rotating shaft (221), two sliding grooves (223) opened on the inner wall of the connecting block (211), the cam (222) slidingly connected to the sliding grooves (223), and a knob (224) fixedly connected to the left end of the rotating shaft (221). The rotating shaft (221) is rotatably connected to the base (1) via a bearing.

6. A bridge-type gantry beam structure for a CNC machine tool according to claim 5, characterized in that, The lightweight component (31) includes several weight-reducing holes (311) opened at the top and bottom of the crossbeam (11), and the inner wall of the crossbeam (11) is provided with hollow steel (312), and several reinforcing steels (313) are fixedly connected between the hollow steel (312) and the inner wall of the crossbeam (11). Among them, several weight-reducing holes (311) are evenly distributed on the top and bottom of the crossbeam (11).

7. A bridge-type gantry beam structure for a CNC machine tool according to claim 6, characterized in that, The balancing assembly (32) includes a motor (321) installed on the left side of the crossbeam (11). The output shaft of the motor (321) is fixedly connected to a bidirectional threaded rod (322) via a coupling. The right end of the bidirectional threaded rod (322) is rotatably connected to the crossbeam (11). The outer wall of the bidirectional threaded rod (322) is threaded with two internal threaded blocks (323). The rear side of each of the two internal threaded blocks (323) is fixedly connected with a counterweight (324). The motor (321) is connected to the crossbeam (11) by bolts.

8. A bridge-type gantry beam structure for a CNC machine tool according to claim 7, characterized in that, The limiting component (33) includes several limiting rods (331) fixedly connected to the front side of the two counterweights (324), and two limiting grooves (332) are opened on the rear side of the crossbeam (11). The front ends of the several limiting rods (331) extend into the interior of the corresponding limiting grooves (332) and slide in connection with the corresponding limiting grooves (332). Among them, four limiting rods (331) are respectively provided on the front side of the two counterweights (324). The four limiting rods (331) on the front side of each counterweight (324) are evenly divided into two groups and are symmetrically distributed on the front side of the counterweights (324).

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